/*
* Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
*
- * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. The rights granted to you under the
- * License may not be used to create, or enable the creation or
- * redistribution of, unlawful or unlicensed copies of an Apple operating
- * system, or to circumvent, violate, or enable the circumvention or
- * violation of, any terms of an Apple operating system software license
- * agreement.
- *
- * Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
* limitations under the License.
- *
- * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* @OSF_COPYRIGHT@
#include <assym.s>
#include <mach/exception_types.h>
-#include <i386/mp.h>
-
-#define PREEMPT_DEBUG_LOG 0
+#define _ARCH_I386_ASM_HELP_H_ /* Prevent inclusion of user header */
+#include <mach/i386/syscall_sw.h>
+#include <i386/mp.h>
/*
* PTmap is recursive pagemap at top of virtual address space.
#define CX(addr,reg) addr(,reg,4)
+/*
+ * The following macros make calls into C code.
+ * They dynamically align the stack to 16 bytes.
+ * Arguments are moved (not pushed) onto the correctly aligned stack.
+ * NOTE: EDI is destroyed in the process, and hence cannot
+ * be directly used as a parameter. Users of this macro must
+ * independently preserve EDI (a non-volatile) if the routine is
+ * intended to be called from C, for instance.
+ */
+
+#define CCALL(fn) \
+ movl %esp, %edi ;\
+ andl $0xFFFFFFF0, %esp ;\
+ call EXT(fn) ;\
+ movl %edi, %esp
+
+#define CCALL1(fn, arg1) \
+ movl %esp, %edi ;\
+ subl $4, %esp ;\
+ andl $0xFFFFFFF0, %esp ;\
+ movl arg1, 0(%esp) ;\
+ call EXT(fn) ;\
+ movl %edi, %esp
+
+#define CCALL2(fn, arg1, arg2) \
+ movl %esp, %edi ;\
+ subl $8, %esp ;\
+ andl $0xFFFFFFF0, %esp ;\
+ movl arg2, 4(%esp) ;\
+ movl arg1, 0(%esp) ;\
+ call EXT(fn) ;\
+ movl %edi, %esp
+
+#define CCALL3(fn, arg1, arg2, arg3) \
+ movl %esp, %edi ;\
+ subl $12, %esp ;\
+ andl $0xFFFFFFF0, %esp ;\
+ movl arg3, 8(%esp) ;\
+ movl arg2, 4(%esp) ;\
+ movl arg1, 0(%esp) ;\
+ call EXT(fn) ;\
+ movl %edi, %esp
+
.text
locore_start:
#ifdef __MACHO__
#define RECOVERY_SECTION .section __VECTORS, __recover
-#define RETRY_SECTION .section __VECTORS, __retries
#else
#define RECOVERY_SECTION .text
#define RECOVERY_SECTION .text
.text
/*
- * Retry table for certain successful faults.
- */
-#define RETRY_TABLE_START \
- .align 3; \
- .globl EXT(retry_table) ;\
-LEXT(retry_table) ;\
- .text
-
-#define RETRY(addr) \
- .align 3 ;\
- .long 9f ;\
- .long addr ;\
- .text ;\
-9:
-
-#define RETRY_TABLE_END \
- .align 3; \
- .globl EXT(retry_table_end) ;\
-LEXT(retry_table_end) ;\
- .text
-
-/*
- * Allocate recovery and retry tables.
+ * Allocate recovery and table.
*/
RECOVERY_SECTION
RECOVER_TABLE_START
- RETRY_SECTION
- RETRY_TABLE_START
/*
* Timing routines.
/*
* Low 32-bits of nanotime returned in %eax.
- * Computed from tsc using conversion scale/shift from per-cpu data.
- * Uses %ecx and %edx.
- */
-#define NANOTIME32 \
- pushl %esi /* save %esi */ ;\
- movl %gs:CPU_THIS,%esi /* per-cpu data ptr */ ;\
- addl $(CPU_RTC_NANOTIME),%esi /* esi -> per-cpu nanotime*/ ;\
- rdtsc /* edx:eax = tsc */ ;\
- subl RTN_TSC(%esi),%eax /* eax = (tsc - base_tsc) */ ;\
- mull RTN_SCALE(%esi) /* eax *= scale */ ;\
- movl RTN_SHIFT(%esi),%ecx /* ecx = shift */ ;\
- shrdl %cl,%edx,%eax /* edx:eax >> shift */ ;\
- andb $32,%cl /* shift == 32? */ ;\
- cmovnel %edx,%eax /* %eax = %edx if so */ ;\
- addl RTN_NANOS(%esi),%eax /* add base ns */ ;\
- popl %esi
+ * Computed from tsc based on the scale factor
+ * and an implicit 32 bit shift.
+ *
+ * Uses %esi, %edi, %ebx, %ecx and %edx.
+ */
+#define RNT_INFO _rtc_nanotime_info
+#define NANOTIME32 \
+0: movl RNT_INFO+RNT_TSC_BASE,%esi ;\
+ movl RNT_INFO+RNT_TSC_BASE+4,%edi ;\
+ rdtsc ;\
+ subl %esi,%eax /* tsc - tsc_base */ ;\
+ sbbl %edi,%edx ;\
+ movl RNT_INFO+RNT_SCALE,%ecx ;\
+ movl %edx,%ebx /* delta * scale */ ;\
+ mull %ecx ;\
+ movl %ebx,%eax ;\
+ movl %edx,%ebx ;\
+ mull %ecx ;\
+ addl %ebx,%eax ;\
+ addl RNT_INFO+RNT_NS_BASE,%eax /* add ns_base */ ;\
+ cmpl RNT_INFO+RNT_TSC_BASE,%esi ;\
+ jne 0b ;\
+ cmpl RNT_INFO+RNT_TSC_BASE+4,%edi ;\
+ jne 0b
/*
* Add 32-bit ns delta in register dreg to timer pointed to by register treg.
* Add time delta to old timer and start new.
*/
#define TIMER_EVENT(old,new) \
- pushl %eax /* must be invariant */ ;\
- cli /* block interrupts */ ;\
NANOTIME32 /* eax low bits nanosecs */ ;\
movl %gs:CPU_PROCESSOR,%ecx /* get current processor */ ;\
movl CURRENT_TIMER(%ecx),%ecx /* get current timer */ ;\
addl $(new##_TIMER-old##_TIMER),%ecx /* point to new timer */ ;\
movl %edx,TIMER_TSTAMP(%ecx) /* set timestamp */ ;\
movl %gs:CPU_PROCESSOR,%edx /* get current processor */ ;\
- movl %ecx,CURRENT_TIMER(%edx) /* set current timer */ ;\
- sti /* interrupts on */ ;\
- popl %eax /* must be invariant */
+ movl %ecx,CURRENT_TIMER(%edx) /* set current timer */
+
/*
* Update time on user trap entry.
- * Uses %ecx,%edx.
+ * Uses %eax,%ecx,%edx,%esi.
*/
#define TIME_TRAP_UENTRY TIMER_EVENT(USER,SYSTEM)
/*
* update time on user trap exit.
- * Uses %ecx,%edx.
+ * Uses %eax,%ecx,%edx,%esi.
*/
#define TIME_TRAP_UEXIT TIMER_EVENT(SYSTEM,USER)
/*
* update time on interrupt entry.
- * Uses %eax,%ecx,%edx.
+ * Uses %eax,%ecx,%edx,%esi.
*/
#define TIME_INT_ENTRY \
NANOTIME32 /* eax low bits nanosecs */ ;\
/*
* update time on interrupt exit.
- * Uses %eax, %ecx, %edx.
+ * Uses %eax, %ecx, %edx, %esi.
*/
#define TIME_INT_EXIT \
NANOTIME32 /* eax low bits nanosecs */ ;\
#endif /* STAT_TIME */
-/*
- * Encapsulate the transfer of exception stack frames between a PCB
- * and a thread stack. Since the whole point of these is to emulate
- * a call or exception that changes privilege level, both macros
- * assume that there is no user esp or ss stored in the source
- * frame (because there was no change of privilege to generate them).
- */
-
-/*
- * Transfer a stack frame from a thread's user stack to its PCB.
- * We assume the thread and stack addresses have been loaded into
- * registers (our arguments).
- *
- * The macro overwrites edi, esi, ecx and whatever registers hold the
- * thread and stack addresses (which can't be one of the above three).
- * The thread address is overwritten with the address of its saved state
- * (where the frame winds up).
- *
- * Must be called on kernel stack.
- */
-#define FRAME_STACK_TO_PCB(thread, stkp) ;\
- movl ACT_PCB(thread),thread /* get act`s PCB */ ;\
- leal PCB_ISS(thread),%edi /* point to PCB`s saved state */;\
- movl %edi,thread /* save for later */ ;\
- movl stkp,%esi /* point to start of frame */ ;\
- movl $ R_UESP,%ecx ;\
- sarl $2,%ecx /* word count for transfer */ ;\
- cld /* we`re incrementing */ ;\
- rep ;\
- movsl /* transfer the frame */ ;\
- addl $ R_UESP,stkp /* derive true "user" esp */ ;\
- movl stkp,R_UESP(thread) /* store in PCB */ ;\
- movl $0,%ecx ;\
- mov %ss,%cx /* get current ss */ ;\
- movl %ecx,R_SS(thread) /* store in PCB */
-
-/*
- * Transfer a stack frame from a thread's PCB to the stack pointed
- * to by the PCB. We assume the thread address has been loaded into
- * a register (our argument).
- *
- * The macro overwrites edi, esi, ecx and whatever register holds the
- * thread address (which can't be one of the above three). The
- * thread address is overwritten with the address of its saved state
- * (where the frame winds up).
- *
- * Must be called on kernel stack.
- */
-#define FRAME_PCB_TO_STACK(thread) ;\
- movl ACT_PCB(thread),%esi /* get act`s PCB */ ;\
- leal PCB_ISS(%esi),%esi /* point to PCB`s saved state */;\
- movl R_UESP(%esi),%edi /* point to end of dest frame */;\
- movl ACT_MAP(thread),%ecx /* get act's map */ ;\
- movl MAP_PMAP(%ecx),%ecx /* get map's pmap */ ;\
- cmpl EXT(kernel_pmap), %ecx /* If kernel loaded task */ ;\
- jz 1f /* use kernel data segment */ ;\
- movl $ USER_DS,%ecx /* else use user data segment */;\
- mov %cx,%es ;\
-1: ;\
- movl $ R_UESP,%ecx ;\
- subl %ecx,%edi /* derive start of frame */ ;\
- movl %edi,thread /* save for later */ ;\
- sarl $2,%ecx /* word count for transfer */ ;\
- cld /* we`re incrementing */ ;\
- rep ;\
- movsl /* transfer the frame */ ;\
- mov %ss,%cx /* restore kernel segments */ ;\
- mov %cx,%es
-
#undef PDEBUG
#ifdef PDEBUG
#define CAH(label)
#endif /* PDEBUG */
-
+
#if MACH_KDB
/*
* Last-ditch debug code to handle faults that might result
*/
Entry(db_task_start)
movl %esp,%edx
- subl $ISS_SIZE,%edx
+ subl $(ISS32_SIZE),%edx
movl %edx,%esp /* allocate i386_saved_state on stack */
movl %eax,R_ERR(%esp)
movl %ebx,R_TRAPNO(%esp)
pushl %edx
CPU_NUMBER(%edx)
- movl CX(EXT(mp_dbtss),%edx),%edx
+ movl CX(EXT(master_dbtss),%edx),%edx
movl TSS_LINK(%edx),%eax
pushl %eax /* pass along selector of previous TSS */
call EXT(db_tss_to_frame)
#endif /* MACH_KDB */
/*
- * Trap/interrupt entry points.
- *
- * All traps must create the following save area on the PCB "stack":
- *
- * gs
- * fs
- * es
- * ds
- * edi
- * esi
- * ebp
- * cr2 if page fault - otherwise unused
- * ebx
- * edx
- * ecx
- * eax
- * trap number
- * error code
- * eip
- * cs
- * eflags
- * user esp - if from user
- * user ss - if from user
- * es - if from V86 thread
- * ds - if from V86 thread
- * fs - if from V86 thread
- * gs - if from V86 thread
- *
+ * Called as a function, makes the current thread
+ * return from the kernel as if from an exception.
*/
-/*
- * General protection or segment-not-present fault.
- * Check for a GP/NP fault in the kernel_return
- * sequence; if there, report it as a GP/NP fault on the user's instruction.
- *
- * esp-> 0: trap code (NP or GP)
- * 4: segment number in error
- * 8 eip
- * 12 cs
- * 16 eflags
- * 20 old registers (trap is from kernel)
- */
-Entry(t_gen_prot)
- pushl $(T_GENERAL_PROTECTION) /* indicate fault type */
- jmp trap_check_kernel_exit /* check for kernel exit sequence */
-
-Entry(t_segnp)
- pushl $(T_SEGMENT_NOT_PRESENT)
- /* indicate fault type */
-
-trap_check_kernel_exit:
- testl $(EFL_VM),16(%esp) /* is trap from V86 mode? */
- jnz EXT(alltraps) /* isn`t kernel trap if so */
- testl $3,12(%esp) /* is trap from kernel mode? */
- jne EXT(alltraps) /* if so: */
- /* check for the kernel exit sequence */
- cmpl $ EXT(kret_iret),8(%esp) /* on IRET? */
- je fault_iret
- cmpl $ EXT(kret_popl_ds),8(%esp) /* popping DS? */
- je fault_popl_ds
- cmpl $ EXT(kret_popl_es),8(%esp) /* popping ES? */
- je fault_popl_es
- cmpl $ EXT(kret_popl_fs),8(%esp) /* popping FS? */
- je fault_popl_fs
- cmpl $ EXT(kret_popl_gs),8(%esp) /* popping GS? */
- je fault_popl_gs
-take_fault: /* if none of the above: */
- jmp EXT(alltraps) /* treat as normal trap. */
-
-/*
- * GP/NP fault on IRET: CS or SS is in error.
- * All registers contain the user's values.
- *
- * on SP is
- * 0 trap number
- * 4 errcode
- * 8 eip
- * 12 cs --> trapno
- * 16 efl --> errcode
- * 20 user eip
- * 24 user cs
- * 28 user eflags
- * 32 user esp
- * 36 user ss
- */
-fault_iret:
- movl %eax,8(%esp) /* save eax (we don`t need saved eip) */
- popl %eax /* get trap number */
- movl %eax,12-4(%esp) /* put in user trap number */
- popl %eax /* get error code */
- movl %eax,16-8(%esp) /* put in user errcode */
- popl %eax /* restore eax */
- CAH(fltir)
- jmp EXT(alltraps) /* take fault */
-
-/*
- * Fault restoring a segment register. The user's registers are still
- * saved on the stack. The offending segment register has not been
- * popped.
- */
-fault_popl_ds:
- popl %eax /* get trap number */
- popl %edx /* get error code */
- addl $12,%esp /* pop stack to user regs */
- jmp push_es /* (DS on top of stack) */
-fault_popl_es:
- popl %eax /* get trap number */
- popl %edx /* get error code */
- addl $12,%esp /* pop stack to user regs */
- jmp push_fs /* (ES on top of stack) */
-fault_popl_fs:
- popl %eax /* get trap number */
- popl %edx /* get error code */
- addl $12,%esp /* pop stack to user regs */
- jmp push_gs /* (FS on top of stack) */
-fault_popl_gs:
- popl %eax /* get trap number */
- popl %edx /* get error code */
- addl $12,%esp /* pop stack to user regs */
- jmp push_segregs /* (GS on top of stack) */
-
-push_es:
- pushl %es /* restore es, */
-push_fs:
- pushl %fs /* restore fs, */
-push_gs:
- pushl %gs /* restore gs. */
-push_segregs:
- movl %eax,R_TRAPNO(%esp) /* set trap number */
- movl %edx,R_ERR(%esp) /* set error code */
- CAH(fltpp)
- jmp trap_set_segs /* take trap */
-
-/*
- * Debug trap. Check for single-stepping across system call into
- * kernel. If this is the case, taking the debug trap has turned
- * off single-stepping - save the flags register with the trace
- * bit set.
- */
-Entry(t_debug)
- testl $(EFL_VM),8(%esp) /* is trap from V86 mode? */
- jnz 0f /* isn`t kernel trap if so */
- testl $3,4(%esp) /* is trap from kernel mode? */
- jnz 0f /* if so: */
- cmpl $syscall_entry,(%esp) /* system call entry? */
- jne 1f /* if so: */
- /* flags are sitting where syscall */
- /* wants them */
- addl $8,%esp /* remove eip/cs */
- jmp syscall_entry_2 /* continue system call entry */
-
-1: cmpl $trap_unix_addr,(%esp)
- jne 0f
- addl $8,%esp
- jmp trap_unix_2
-
-0: pushl $0 /* otherwise: */
- pushl $(T_DEBUG) /* handle as normal */
- jmp EXT(alltraps) /* debug fault */
+ .globl EXT(thread_exception_return)
+ .globl EXT(thread_bootstrap_return)
+LEXT(thread_exception_return)
+LEXT(thread_bootstrap_return)
+ cli
+ movl %gs:CPU_KERNEL_STACK,%ecx
+ movl (%ecx),%esp /* switch back to PCB stack */
+ jmp EXT(return_from_trap)
-/*
- * Page fault traps save cr2.
- */
-Entry(t_page_fault)
- pushl $(T_PAGE_FAULT) /* mark a page fault trap */
- pusha /* save the general registers */
- movl %cr2,%eax /* get the faulting address */
- movl %eax,12(%esp) /* save in esp save slot */
- jmp trap_push_segs /* continue fault */
+Entry(call_continuation)
+ movl S_ARG0,%eax /* get continuation */
+ movl S_ARG1,%edx /* continuation param */
+ movl S_ARG2,%ecx /* wait result */
+ movl %gs:CPU_KERNEL_STACK,%esp /* pop the stack */
+ xorl %ebp,%ebp /* zero frame pointer */
+ subl $8,%esp /* align the stack */
+ pushl %ecx
+ pushl %edx
+ call *%eax /* call continuation */
+ addl $16,%esp
+ movl %gs:CPU_ACTIVE_THREAD,%eax
+ pushl %eax
+ call EXT(thread_terminate)
+
-/*
- * All 'exceptions' enter here with:
- * esp-> trap number
- * error code
- * old eip
- * old cs
- * old eflags
- * old esp if trapped from user
- * old ss if trapped from user
+
+/*******************************************************************************************************
+ *
+ * All 64 bit task 'exceptions' enter lo_alltraps:
+ * esp -> x86_saved_state_t
+ *
+ * The rest of the state is set up as:
+ * cr3 -> kernel directory
+ * esp -> low based stack
+ * gs -> CPU_DATA_GS
+ * cs -> KERNEL_CS
+ * ss/ds/es -> KERNEL_DS
*
- * NB: below use of CPU_NUMBER assumes that macro will use correct
- * segment register for any kernel data accesses.
- */
-Entry(alltraps)
- pusha /* save the general registers */
-trap_push_segs:
- pushl %ds /* save the segment registers */
- pushl %es
- pushl %fs
- pushl %gs
-
-trap_set_segs:
- movl %ss,%eax
- movl %eax,%ds
- movl %eax,%es /* switch to kernel data seg */
- cld /* clear direction flag */
- testl $(EFL_VM),R_EFLAGS(%esp) /* in V86 mode? */
- jnz trap_from_user /* user mode trap if so */
- testb $3,R_CS(%esp) /* user mode trap? */
- jnz trap_from_user
- cmpl $0,%gs:CPU_ACTIVE_KLOADED
- je trap_from_kernel /* if clear, truly in kernel */
-#ifdef FIXME
- cmpl ETEXT_ADDR,R_EIP(%esp) /* pc within kernel? */
- jb trap_from_kernel
-#endif
-trap_from_kloaded:
- /*
- * We didn't enter here "through" PCB (i.e., using ring 0 stack),
- * so transfer the stack frame into the PCB explicitly, then
- * start running on resulting "PCB stack". We have to set
- * up a simulated "uesp" manually, since there's none in the
- * frame.
- */
- mov $ CPU_DATA_GS,%dx
- mov %dx,%gs
- CAH(atstart)
- movl %gs:CPU_ACTIVE_KLOADED,%ebx
- movl %gs:CPU_KERNEL_STACK,%eax
- xchgl %esp,%eax
- FRAME_STACK_TO_PCB(%ebx,%eax)
- CAH(atend)
- jmp EXT(take_trap)
-
-trap_from_user:
- mov $ CPU_DATA_GS,%ax
- mov %ax,%gs
-
+ * interrupts disabled
+ * direction flag cleared
+ */
+Entry(lo_alltraps)
+ movl R_CS(%esp),%eax /* assume 32-bit state */
+ cmpl $(SS_64),SS_FLAVOR(%esp)/* 64-bit? */
+ jne 1f
+ movl R64_CS(%esp),%eax /* 64-bit user mode */
+1:
+ testb $3,%eax
+ jz trap_from_kernel
+ /* user mode trap */
TIME_TRAP_UENTRY
movl %gs:CPU_KERNEL_STACK,%ebx
- xchgl %ebx,%esp /* switch to kernel stack */
- /* user regs pointer already set */
-LEXT(take_trap)
- pushl %ebx /* record register save area */
- pushl %ebx /* pass register save area to trap */
- call EXT(user_trap) /* call user trap routine */
- movl 4(%esp),%esp /* switch back to PCB stack */
+ xchgl %ebx,%esp /* switch to kernel stack */
+ sti
+
+ CCALL1(user_trap, %ebx) /* call user trap routine */
+ cli /* hold off intrs - critical section */
+ popl %esp /* switch back to PCB stack */
/*
* Return from trap or system call, checking for ASTs.
- * On PCB stack.
- */
-
+ * On lowbase PCB stack with intrs disabled
+ */
LEXT(return_from_trap)
- movl %gs:CPU_PENDING_AST,%edx
- cmpl $0,%edx
- je EXT(return_to_user) /* if we need an AST: */
-
- movl %gs:CPU_KERNEL_STACK,%esp
- /* switch to kernel stack */
- pushl $0 /* push preemption flag */
- call EXT(i386_astintr) /* take the AST */
- addl $4,%esp /* pop preemption flag */
+ movl %gs:CPU_PENDING_AST,%eax
+ testl %eax,%eax
+ je EXT(return_to_user) /* branch if no AST */
+
+ movl %gs:CPU_KERNEL_STACK,%ebx
+ xchgl %ebx,%esp /* switch to kernel stack */
+ sti /* interrupts always enabled on return to user mode */
+
+ pushl %ebx /* save PCB stack */
+ CCALL1(i386_astintr, $0) /* take the AST */
+ cli
popl %esp /* switch back to PCB stack (w/exc link) */
jmp EXT(return_from_trap) /* and check again (rare) */
- /* ASTs after this point will */
- /* have to wait */
-/*
- * Arrange the checks needed for kernel-loaded (or kernel-loading)
- * threads so that branch is taken in kernel-loaded case.
- */
LEXT(return_to_user)
TIME_TRAP_UEXIT
- cmpl $0,%gs:CPU_ACTIVE_KLOADED
- jnz EXT(return_xfer_stack)
- movl %gs:CPU_ACTIVE_THREAD, %ebx /* get active thread */
-#if MACH_RT
-#if MACH_ASSERT
- cmpl $0,%gs:CPU_PREEMPTION_LEVEL
- je EXT(return_from_kernel)
- int $3
-#endif /* MACH_ASSERT */
-#endif /* MACH_RT */
-
-/*
- * Return from kernel mode to interrupted thread.
- */
-
-LEXT(return_from_kernel)
-LEXT(kret_popl_gs)
- popl %gs /* restore segment registers */
-LEXT(kret_popl_fs)
- popl %fs
-LEXT(kret_popl_es)
- popl %es
-LEXT(kret_popl_ds)
- popl %ds
- popa /* restore general registers */
- addl $8,%esp /* discard trap number and error code */
+LEXT(ret_to_user)
+ cmpl $0, %gs:CPU_IS64BIT
+ je EXT(lo_ret_to_user)
+ jmp EXT(lo64_ret_to_user)
-LEXT(kret_iret)
- iret /* return from interrupt */
-
-
-LEXT(return_xfer_stack)
- /*
- * If we're on PCB stack in a kernel-loaded task, we have
- * to transfer saved state back to thread stack and swap
- * stack pointers here, because the hardware's not going
- * to do so for us.
- */
- CAH(rxsstart)
- movl %gs:CPU_KERNEL_STACK,%esp
- movl %gs:CPU_ACTIVE_KLOADED,%eax
- FRAME_PCB_TO_STACK(%eax)
- movl %eax,%esp
- CAH(rxsend)
- jmp EXT(return_from_kernel)
-
-/*
- * Hate to put this here, but setting up a separate swap_func for
- * kernel-loaded threads no longer works, since thread executes
- * "for a while" (i.e., until it reaches glue code) when first
- * created, even if it's nominally suspended. Hence we can't
- * transfer the PCB when the thread first resumes, because we
- * haven't initialized it yet.
- */
-/*
- * Have to force transfer to new stack "manually". Use a string
- * move to transfer all of our saved state to the stack pointed
- * to by iss.uesp, then install a pointer to it as our current
- * stack pointer.
- */
-LEXT(return_kernel_loading)
- movl %gs:CPU_KERNEL_STACK,%esp
- movl %gs:CPU_ACTIVE_THREAD, %ebx /* get active thread */
- movl %ebx,%edx /* save for later */
- FRAME_PCB_TO_STACK(%ebx)
- movl %ebx,%esp /* start running on new stack */
- movl $0,%gs:CPU_ACTIVE_KLOADED /* set cached indicator */
- jmp EXT(return_from_kernel)
+
/*
- * Trap from kernel mode. No need to switch stacks or load segment registers.
+ * Trap from kernel mode. No need to switch stacks.
+ * Interrupts must be off here - we will set them to state at time of trap
+ * as soon as it's safe for us to do so and not recurse doing preemption
*/
trap_from_kernel:
-#if MACH_KDB || MACH_KGDB
- mov $ CPU_DATA_GS,%ax
- mov %ax,%gs
- movl %esp,%ebx /* save current stack */
-
- cmpl EXT(int_stack_high),%esp /* on an interrupt stack? */
- jb 6f /* OK if so */
-
-#if MACH_KGDB
- cmpl $0,EXT(kgdb_active) /* Unexpected trap in kgdb */
- je 0f /* no */
-
- pushl %esp /* Already on kgdb stack */
- cli
- call EXT(kgdb_trap)
- addl $4,%esp
- jmp EXT(return_from_kernel)
-0: /* should kgdb handle this exception? */
- cmpl $(T_NO_FPU),R_TRAPNO(%esp) /* FPU disabled? */
- je 2f /* yes */
- cmpl $(T_PAGE_FAULT),R_TRAPNO(%esp) /* page fault? */
- je 2f /* yes */
-1:
- cli /* disable interrupts */
- CPU_NUMBER(%edx) /* get CPU number */
- movl CX(EXT(kgdb_stacks),%edx),%ebx
- xchgl %ebx,%esp /* switch to kgdb stack */
- pushl %ebx /* pass old sp as an arg */
- call EXT(kgdb_from_kernel)
- popl %esp /* switch back to kernel stack */
- jmp EXT(return_from_kernel)
-2:
-#endif /* MACH_KGDB */
-
-#if MACH_KDB
- cmpl $0,EXT(db_active) /* could trap be from ddb? */
- je 3f /* no */
- CPU_NUMBER(%edx) /* see if this CPU is in ddb */
- cmpl $0,CX(EXT(kdb_active),%edx)
- je 3f /* no */
- pushl %esp
- call EXT(db_trap_from_asm)
- addl $0x4,%esp
- jmp EXT(return_from_kernel)
-
-3:
- /*
- * Dilemma: don't want to switch to kernel_stack if trap
- * "belongs" to ddb; don't want to switch to db_stack if
- * trap "belongs" to kernel. So have to duplicate here the
- * set of trap types that kernel_trap() handles. Note that
- * "unexpected" page faults will not be handled by kernel_trap().
- * In this panic-worthy case, we fall into the debugger with
- * kernel_stack containing the call chain that led to the
- * bogus fault.
- */
- movl R_TRAPNO(%esp),%edx
- cmpl $(T_PAGE_FAULT),%edx
- je 4f
- cmpl $(T_NO_FPU),%edx
- je 4f
- cmpl $(T_FPU_FAULT),%edx
- je 4f
- cmpl $(T_FLOATING_POINT_ERROR),%edx
- je 4f
- cmpl $(T_PREEMPT),%edx
- jne 7f
-4:
-#endif /* MACH_KDB */
+ movl %esp, %eax /* saved state addr */
+ CCALL1(kernel_trap, %eax) /* to kernel trap routine */
+ cli
- cmpl %gs:CPU_KERNEL_STACK,%esp
- /* if not already on kernel stack, */
- ja 5f /* check some more */
- cmpl %gs:CPU_ACTIVE_STACK,%esp
- ja 6f /* on kernel stack: no switch */
-5:
- movl %gs:CPU_KERNEL_STACK,%esp
-6:
- pushl %ebx /* save old stack */
- pushl %ebx /* pass as parameter */
- call EXT(kernel_trap) /* to kernel trap routine */
- addl $4,%esp /* pop parameter */
- testl %eax,%eax
- jne 8f
- /*
- * If kernel_trap returns false, trap wasn't handled.
- */
-7:
-#if MACH_KDB
- CPU_NUMBER(%edx)
- movl CX(EXT(db_stacks),%edx),%esp
- pushl %ebx /* pass old stack as parameter */
- call EXT(db_trap_from_asm)
-#endif /* MACH_KDB */
-#if MACH_KGDB
- cli /* disable interrupts */
- CPU_NUMBER(%edx) /* get CPU number */
- movl CX(EXT(kgdb_stacks),%edx),%esp
- pushl %ebx /* pass old stack as parameter */
- call EXT(kgdb_from_kernel)
-#endif /* MACH_KGDB */
- addl $4,%esp /* pop parameter */
- testl %eax,%eax
- jne 8f
- /*
- * Likewise, if kdb_trap/kgdb_from_kernel returns false, trap
- * wasn't handled.
- */
- pushl %ebx /* pass old stack as parameter */
- call EXT(panic_trap)
- addl $4,%esp /* pop parameter */
-8:
- movl %ebx,%esp /* get old stack (from callee-saves reg) */
-#else /* MACH_KDB || MACH_KGDB */
- pushl %esp /* pass parameter */
- call EXT(kernel_trap) /* to kernel trap routine */
- addl $4,%esp /* pop parameter */
-#endif /* MACH_KDB || MACH_KGDB */
-
-#if MACH_RT
movl %gs:CPU_PENDING_AST,%eax /* get pending asts */
testl $ AST_URGENT,%eax /* any urgent preemption? */
- je EXT(return_from_kernel) /* no, nothing to do */
- cmpl $ T_PREEMPT,48(%esp) /* preempt request? */
- jne EXT(return_from_kernel) /* no, nothing to do */
+ je ret_to_kernel /* no, nothing to do */
+ cmpl $ T_PREEMPT,R_TRAPNO(%esp)
+ je ret_to_kernel /* T_PREEMPT handled in kernel_trap() */
+ testl $ EFL_IF,R_EFLAGS(%esp) /* interrupts disabled? */
+ je ret_to_kernel
+ cmpl $0,%gs:CPU_PREEMPTION_LEVEL /* preemption disabled? */
+ jne ret_to_kernel
movl %gs:CPU_KERNEL_STACK,%eax
movl %esp,%ecx
xorl %eax,%ecx
andl $(-KERNEL_STACK_SIZE),%ecx
testl %ecx,%ecx /* are we on the kernel stack? */
- jne EXT(return_from_kernel) /* no, skip it */
-
-#if PREEMPT_DEBUG_LOG
- pushl 28(%esp) /* stack pointer */
- pushl 24+4(%esp) /* frame pointer */
- pushl 56+8(%esp) /* stack pointer */
- pushl $0f
- call EXT(log_thread_action)
- addl $16, %esp
- .data
-0: String "trap preempt eip"
- .text
-#endif /* PREEMPT_DEBUG_LOG */
-
- pushl $1 /* push preemption flag */
- call EXT(i386_astintr) /* take the AST */
- addl $4,%esp /* pop preemption flag */
-#endif /* MACH_RT */
-
- jmp EXT(return_from_kernel)
+ jne ret_to_kernel /* no, skip it */
-/*
- * Called as a function, makes the current thread
- * return from the kernel as if from an exception.
- */
+ CCALL1(i386_astintr, $1) /* take the AST */
- .globl EXT(thread_exception_return)
- .globl EXT(thread_bootstrap_return)
-LEXT(thread_exception_return)
-LEXT(thread_bootstrap_return)
- movl %esp,%ecx /* get kernel stack */
- or $(KERNEL_STACK_SIZE-1),%ecx
- movl -3-IKS_SIZE(%ecx),%esp /* switch back to PCB stack */
- jmp EXT(return_from_trap)
+ret_to_kernel:
+ cmpl $0, %gs:CPU_IS64BIT
+ je EXT(lo_ret_to_kernel)
+ jmp EXT(lo64_ret_to_kernel)
-Entry(call_continuation)
- movl S_ARG0,%eax /* get continuation */
- movl S_ARG1,%edx /* continuation param */
- movl S_ARG2,%ecx /* wait result */
- movl %esp,%ebp /* get kernel stack */
- or $(KERNEL_STACK_SIZE-1),%ebp
- addl $(-3-IKS_SIZE),%ebp
- movl %ebp,%esp /* pop the stack */
- xorl %ebp,%ebp /* zero frame pointer */
- pushl %ecx
- pushl %edx
- call *%eax /* call continuation */
- addl $8,%esp
- movl %gs:CPU_ACTIVE_THREAD,%eax
- pushl %eax
- call EXT(thread_terminate)
-#if 0
-#define LOG_INTERRUPT(info,msg) \
- pushal ; \
- pushl msg ; \
- pushl info ; \
- call EXT(log_thread_action) ; \
- add $8,%esp ; \
- popal
-#define CHECK_INTERRUPT_TIME(n) \
- pushal ; \
- pushl $n ; \
- call EXT(check_thread_time) ; \
- add $4,%esp ; \
- popal
-#else
-#define LOG_INTERRUPT(info,msg)
-#define CHECK_INTERRUPT_TIME(n)
-#endif
-
-.data
-imsg_start:
- String "interrupt start"
-imsg_end:
- String "interrupt end"
-
-.text
-/*
- * All interrupts enter here.
- * old %eax on stack; interrupt number in %eax.
- */
-Entry(all_intrs)
- pushl %ecx /* save registers */
- pushl %edx
- cld /* clear direction flag */
-
- pushl %ds /* save segment registers */
- pushl %es
- pushl %fs
- pushl %gs
- mov %ss,%dx /* switch to kernel segments */
- mov %dx,%ds
- mov %dx,%es
- mov $ CPU_DATA_GS,%dx
- mov %dx,%gs
+/*******************************************************************************************************
+ *
+ * All interrupts on all tasks enter here with:
+ * esp-> -> x86_saved_state_t
+ *
+ * cr3 -> kernel directory
+ * esp -> low based stack
+ * gs -> CPU_DATA_GS
+ * cs -> KERNEL_CS
+ * ss/ds/es -> KERNEL_DS
+ *
+ * interrupts disabled
+ * direction flag cleared
+ */
+Entry(lo_allintrs)
/*
* test whether already on interrupt stack
*/
leal -INTSTACK_SIZE(%ecx),%edx
cmpl %esp,%edx
jb int_from_intstack
-1:
- movl %esp,%edx /* & i386_interrupt_state */
+1:
xchgl %ecx,%esp /* switch to interrupt stack */
+ movl %cr0,%eax /* get cr0 */
+ orl $(CR0_TS),%eax /* or in TS bit */
+ movl %eax,%cr0 /* set cr0 */
+
+ subl $8, %esp /* for 16-byte stack alignment */
pushl %ecx /* save pointer to old stack */
- pushl %edx /* pass &i386_interrupt_state to pe_incoming_interrupt */
- pushl %eax /* push trap number */
+ movl %ecx,%gs:CPU_INT_STATE /* save intr state */
TIME_INT_ENTRY /* do timing */
-#if MACH_RT
incl %gs:CPU_PREEMPTION_LEVEL
-#endif /* MACH_RT */
incl %gs:CPU_INTERRUPT_LEVEL
- call EXT(PE_incoming_interrupt) /* call generic interrupt routine */
- addl $8,%esp /* Pop trap number and eip */
+ movl %gs:CPU_INT_STATE, %eax
+ CCALL1(PE_incoming_interrupt, %eax) /* call generic interrupt routine */
+
+ cli /* just in case we returned with intrs enabled */
+ xorl %eax,%eax
+ movl %eax,%gs:CPU_INT_STATE /* clear intr state pointer */
.globl EXT(return_to_iret)
LEXT(return_to_iret) /* (label for kdb_kintr and hardclock) */
decl %gs:CPU_INTERRUPT_LEVEL
-
-#if MACH_RT
decl %gs:CPU_PREEMPTION_LEVEL
-#endif /* MACH_RT */
TIME_INT_EXIT /* do timing */
+ movl %gs:CPU_ACTIVE_THREAD,%eax
+ movl ACT_PCB(%eax),%eax /* get act`s PCB */
+ movl PCB_FPS(%eax),%eax /* get pcb's ims.ifps */
+ cmpl $0,%eax /* Is there a context */
+ je 1f /* Branch if not */
+ movl FP_VALID(%eax),%eax /* Load fp_valid */
+ cmpl $0,%eax /* Check if valid */
+ jne 1f /* Branch if valid */
+ clts /* Clear TS */
+ jmp 2f
+1:
+ movl %cr0,%eax /* get cr0 */
+ orl $(CR0_TS),%eax /* or in TS bit */
+ movl %eax,%cr0 /* set cr0 */
+2:
popl %esp /* switch back to old stack */
- movl %gs:CPU_PENDING_AST,%eax
- testl %eax,%eax /* any pending asts? */
- je 1f /* no, nothing to do */
- testl $(EFL_VM),I_EFL(%esp) /* if in V86 */
- jnz ast_from_interrupt /* take it */
- testb $3,I_CS(%esp) /* user mode, */
- jnz ast_from_interrupt /* take it */
-#ifdef FIXME
- cmpl ETEXT_ADDR,I_EIP(%esp) /* if within kernel-loaded task, */
- jnb ast_from_interrupt /* take it */
-#endif
+ /* Load interrupted code segment into %eax */
+ movl R_CS(%esp),%eax /* assume 32-bit state */
+ cmpl $(SS_64),SS_FLAVOR(%esp)/* 64-bit? */
+ jne 3f
+ movl R64_CS(%esp),%eax /* 64-bit user mode */
+3:
+ testb $3,%eax /* user mode, */
+ jnz ast_from_interrupt_user /* go handle potential ASTs */
+ /*
+ * we only want to handle preemption requests if
+ * the interrupt fell in the kernel context
+ * and preemption isn't disabled
+ */
+ movl %gs:CPU_PENDING_AST,%eax
+ testl $ AST_URGENT,%eax /* any urgent requests? */
+ je ret_to_kernel /* no, nothing to do */
+
+ cmpl $0,%gs:CPU_PREEMPTION_LEVEL /* preemption disabled? */
+ jne ret_to_kernel /* yes, skip it */
-#if MACH_RT
- cmpl $0,%gs:CPU_PREEMPTION_LEVEL /* preemption masked? */
- jne 1f /* yes, skip it */
- testl $ AST_URGENT,%eax /* any urgent requests? */
- je 1f /* no, skip it */
- cmpl $ EXT(locore_end),I_EIP(%esp) /* are we in locore code? */
- jb 1f /* yes, skip it */
movl %gs:CPU_KERNEL_STACK,%eax
movl %esp,%ecx
xorl %eax,%ecx
andl $(-KERNEL_STACK_SIZE),%ecx
- testl %ecx,%ecx /* are we on the kernel stack? */
- jne 1f /* no, skip it */
+ testl %ecx,%ecx /* are we on the kernel stack? */
+ jne ret_to_kernel /* no, skip it */
-/*
- * Take an AST from kernel space. We don't need (and don't want)
- * to do as much as the case where the interrupt came from user
- * space.
- */
-#if PREEMPT_DEBUG_LOG
- pushl $0
- pushl $0
- pushl I_EIP+8(%esp)
- pushl $0f
- call EXT(log_thread_action)
- addl $16, %esp
- .data
-0: String "intr preempt eip"
- .text
-#endif /* PREEMPT_DEBUG_LOG */
+ /*
+ * Take an AST from kernel space. We don't need (and don't want)
+ * to do as much as the case where the interrupt came from user
+ * space.
+ */
+ CCALL1(i386_astintr, $1)
- sti
- pushl $1 /* push preemption flag */
- call EXT(i386_astintr) /* take the AST */
- addl $4,%esp /* pop preemption flag */
-#endif /* MACH_RT */
+ jmp ret_to_kernel
-1:
- pop %gs
- pop %fs
- pop %es /* restore segment regs */
- pop %ds
- pop %edx
- pop %ecx
- pop %eax
- iret /* return to caller */
+/*
+ * nested int - simple path, can't preempt etc on way out
+ */
int_from_intstack:
-#if MACH_RT
incl %gs:CPU_PREEMPTION_LEVEL
-#endif /* MACH_RT */
-
incl %gs:CPU_INTERRUPT_LEVEL
- movl %esp, %edx /* i386_interrupt_state */
- pushl %edx /* pass &i386_interrupt_state to PE_incoming_interrupt /*
-
- pushl %eax /* Push trap number */
-
- call EXT(PE_incoming_interrupt)
- addl $20,%esp /* pop i386_interrupt_state, gs,fs,es,ds */
-
-LEXT(return_to_iret_i) /* ( label for kdb_kintr) */
-
- addl $4,%esp /* pop trap number */
+ movl %esp, %edx /* i386_saved_state */
+ CCALL1(PE_incoming_interrupt, %edx)
decl %gs:CPU_INTERRUPT_LEVEL
-
-#if MACH_RT
decl %gs:CPU_PREEMPTION_LEVEL
-#endif /* MACH_RT */
- pop %edx /* must have been on kernel segs */
- pop %ecx
- pop %eax /* no ASTs */
- iret
+ jmp ret_to_kernel
/*
- * Take an AST from an interrupt.
- * On PCB stack.
- * sp-> es -> edx
- * ds -> ecx
- * edx -> eax
- * ecx -> trapno
- * eax -> code
- * eip
- * cs
- * efl
- * esp
- * ss
- */
-ast_from_interrupt:
- pop %gs
- pop %fs
- pop %es /* restore all registers ... */
- pop %ds
- popl %edx
- popl %ecx
- popl %eax
- sti /* Reenable interrupts */
- pushl $0 /* zero code */
- pushl $0 /* zero trap number */
- pusha /* save general registers */
- push %ds /* save segment registers */
- push %es
- push %fs
- push %gs
- mov %ss,%dx /* switch to kernel segments */
- mov %dx,%ds
- mov %dx,%es
- mov $ CPU_DATA_GS,%dx
- mov %dx,%gs
-
- /*
- * See if we interrupted a kernel-loaded thread executing
- * in its own task.
- */
- CPU_NUMBER(%edx)
- testl $(EFL_VM),R_EFLAGS(%esp) /* in V86 mode? */
- jnz 0f /* user mode trap if so */
- testb $3,R_CS(%esp)
- jnz 0f /* user mode, back to normal */
-#ifdef FIXME
- cmpl ETEXT_ADDR,R_EIP(%esp)
- jb 0f /* not kernel-loaded, back to normal */
-#endif
+ * Take an AST from an interrupted user
+ */
+ast_from_interrupt_user:
+ movl %gs:CPU_PENDING_AST,%eax
+ testl %eax,%eax /* pending ASTs? */
+ je EXT(ret_to_user) /* no, nothing to do */
- /*
- * Transfer the current stack frame by hand into the PCB.
- */
- CAH(afistart)
- movl %gs:CPU_ACTIVE_KLOADED,%eax
- movl %gs:CPU_KERNEL_STACK,%ebx
- xchgl %ebx,%esp
- FRAME_STACK_TO_PCB(%eax,%ebx)
- CAH(afiend)
- TIME_TRAP_UENTRY
- jmp 3f
-0:
TIME_TRAP_UENTRY
- movl %gs:CPU_KERNEL_STACK,%eax
- /* switch to kernel stack */
- xchgl %eax,%esp
-3:
- pushl %eax
- pushl $0 /* push preemption flag */
- call EXT(i386_astintr) /* take the AST */
- addl $4,%esp /* pop preemption flag */
- popl %esp /* back to PCB stack */
jmp EXT(return_from_trap) /* return */
-#if MACH_KDB || MACH_KGDB
-/*
- * kdb_kintr: enter kdb from keyboard interrupt.
- * Chase down the stack frames until we find one whose return
- * address is the interrupt handler. At that point, we have:
- *
- * frame-> saved %ebp
- * return address in interrupt handler
- * ivect
- * saved SPL
- * return address == return_to_iret_i
- * saved %edx
- * saved %ecx
- * saved %eax
- * saved %eip
- * saved %cs
- * saved %efl
+
+/*******************************************************************************************************
*
- * OR:
- * frame-> saved %ebp
- * return address in interrupt handler
- * ivect
- * saved SPL
- * return address == return_to_iret
- * pointer to save area on old stack
- * [ saved %ebx, if accurate timing ]
+ * 32bit Tasks
+ * System call entries via INTR_GATE or sysenter:
*
- * old stack: saved %es
- * saved %ds
- * saved %edx
- * saved %ecx
- * saved %eax
- * saved %eip
- * saved %cs
- * saved %efl
+ * esp -> i386_saved_state_t
+ * cr3 -> kernel directory
+ * esp -> low based stack
+ * gs -> CPU_DATA_GS
+ * cs -> KERNEL_CS
+ * ss/ds/es -> KERNEL_DS
*
- * Call kdb, passing it that register save area.
- */
-
-#if MACH_KGDB
-Entry(kgdb_kintr)
-#endif /* MACH_KGDB */
-#if MACH_KDB
-Entry(kdb_kintr)
-#endif /* MACH_KDB */
- movl %ebp,%eax /* save caller`s frame pointer */
- movl $ EXT(return_to_iret),%ecx /* interrupt return address 1 */
- movl $ EXT(return_to_iret_i),%edx /* interrupt return address 2 */
-
-0: cmpl 16(%eax),%ecx /* does this frame return to */
- /* interrupt handler (1)? */
- je 1f
- cmpl $kdb_from_iret,16(%eax)
- je 1f
- cmpl 16(%eax),%edx /* interrupt handler (2)? */
- je 2f /* if not: */
- cmpl $kdb_from_iret_i,16(%eax)
- je 2f
- movl (%eax),%eax /* try next frame */
- jmp 0b
-
-1: movl $kdb_from_iret,16(%eax) /* returns to kernel/user stack */
- ret
-
-2: movl $kdb_from_iret_i,16(%eax)
- /* returns to interrupt stack */
- ret
-
-/*
- * On return from keyboard interrupt, we will execute
- * kdb_from_iret_i
- * if returning to an interrupt on the interrupt stack
- * kdb_from_iret
- * if returning to an interrupt on the user or kernel stack
- */
-kdb_from_iret:
- /* save regs in known locations */
- pushl %ebx /* caller`s %ebx is in reg */
- pushl %ebp
- pushl %esi
- pushl %edi
- push %fs
- push %gs
-#if MACH_KGDB
- cli
- pushl %esp /* pass regs */
- call EXT(kgdb_kentry) /* to kgdb */
- addl $4,%esp /* pop parameters */
-#endif /* MACH_KGDB */
-#if MACH_KDB
- pushl %esp /* pass regs */
- call EXT(kdb_kentry) /* to kdb */
- addl $4,%esp /* pop parameters */
-#endif /* MACH_KDB */
- pop %gs /* restore registers */
- pop %fs
- popl %edi
- popl %esi
- popl %ebp
- popl %ebx
- jmp EXT(return_to_iret) /* normal interrupt return */
-
-kdb_from_iret_i: /* on interrupt stack */
- pop %edx /* restore saved registers */
- pop %ecx
- pop %eax
- pushl $0 /* zero error code */
- pushl $0 /* zero trap number */
- pusha /* save general registers */
- push %ds /* save segment registers */
- push %es
- push %fs
- push %gs
-#if MACH_KGDB
- cli /* disable interrupts */
- CPU_NUMBER(%edx) /* get CPU number */
- movl CX(EXT(kgdb_stacks),%edx),%ebx
- xchgl %ebx,%esp /* switch to kgdb stack */
- pushl %ebx /* pass old sp as an arg */
- call EXT(kgdb_from_kernel)
- popl %esp /* switch back to interrupt stack */
-#endif /* MACH_KGDB */
-#if MACH_KDB
- pushl %esp /* pass regs, */
- pushl $0 /* code, */
- pushl $-1 /* type to kdb */
- call EXT(kdb_trap)
- addl $12,%esp
-#endif /* MACH_KDB */
- pop %gs /* restore segment registers */
- pop %fs
- pop %es
- pop %ds
- popa /* restore general registers */
- addl $8,%esp
- iret
-
-#endif /* MACH_KDB || MACH_KGDB */
-
-
-/*
- * Mach RPC enters through a call gate, like a system call.
+ * interrupts disabled
+ * direction flag cleared
*/
-Entry(mach_rpc)
- pushf /* save flags as soon as possible */
- pushl %eax /* save system call number */
- pushl $0 /* clear trap number slot */
-
- pusha /* save the general registers */
- pushl %ds /* and the segment registers */
- pushl %es
- pushl %fs
- pushl %gs
-
- mov %ss,%dx /* switch to kernel data segment */
- mov %dx,%ds
- mov %dx,%es
- mov $ CPU_DATA_GS,%dx
- mov %dx,%gs
-
-/*
- * Shuffle eflags,eip,cs into proper places
- */
-
- movl R_EIP(%esp),%ebx /* eflags are in EIP slot */
- movl R_CS(%esp),%ecx /* eip is in CS slot */
- movl R_EFLAGS(%esp),%edx /* cs is in EFLAGS slot */
- movl %ecx,R_EIP(%esp) /* fix eip */
- movl %edx,R_CS(%esp) /* fix cs */
- movl %ebx,R_EFLAGS(%esp) /* fix eflags */
-
+Entry(lo_sysenter)
+ /*
+ * We can be here either for a mach syscall or a unix syscall,
+ * as indicated by the sign of the code:
+ */
+ movl R_EAX(%esp),%eax
+ testl %eax,%eax
+ js EXT(lo_mach_scall) /* < 0 => mach */
+ /* > 0 => unix */
+
+Entry(lo_unix_scall)
TIME_TRAP_UENTRY
- negl %eax /* get system call number */
- shll $4,%eax /* manual indexing */
-
-/*
- * Check here for mach_rpc from kernel-loaded task --
- * - Note that kernel-loaded task returns via real return.
- * We didn't enter here "through" PCB (i.e., using ring 0 stack),
- * so transfer the stack frame into the PCB explicitly, then
- * start running on resulting "PCB stack". We have to set
- * up a simulated "uesp" manually, since there's none in the
- * frame.
- */
- cmpl $0,%gs:CPU_ACTIVE_KLOADED
- jz 2f
- CAH(mrstart)
- movl %gs:CPU_ACTIVE_KLOADED,%ebx
- movl %gs:CPU_KERNEL_STACK,%edx
- xchgl %edx,%esp
-
- FRAME_STACK_TO_PCB(%ebx,%edx)
- CAH(mrend)
-
- jmp 3f
-
-2:
movl %gs:CPU_KERNEL_STACK,%ebx
- /* get current kernel stack */
- xchgl %ebx,%esp /* switch stacks - %ebx points to */
- /* user registers. */
-
-3:
-
-/*
- * Register use on entry:
- * eax contains syscall number
- * ebx contains user regs pointer
- */
-#undef RPC_TRAP_REGISTERS
-#ifdef RPC_TRAP_REGISTERS
- pushl R_ESI(%ebx)
- pushl R_EDI(%ebx)
- pushl R_ECX(%ebx)
- pushl R_EDX(%ebx)
-#else
- movl EXT(mach_trap_table)(%eax),%ecx
- /* get number of arguments */
- jecxz 2f /* skip argument copy if none */
- movl R_UESP(%ebx),%esi /* get user stack pointer */
- lea 4(%esi,%ecx,4),%esi /* skip user return address, */
- /* and point past last argument */
- movl %gs:CPU_ACTIVE_KLOADED,%edx
- /* point to current thread */
- orl %edx,%edx /* if ! kernel-loaded, check addr */
- jz 4f /* else */
- mov %ds,%dx /* kernel data segment access */
- jmp 5f
-4:
- cmpl $(VM_MAX_ADDRESS),%esi /* in user space? */
- ja mach_call_addr /* address error if not */
- movl $ USER_DS,%edx /* user data segment access */
-5:
- mov %dx,%fs
- movl %esp,%edx /* save kernel ESP for error recovery */
-1:
- subl $4,%esi
- RECOVERY_SECTION
- RECOVER(mach_call_addr_push)
- pushl %fs:(%esi) /* push argument on stack */
- loop 1b /* loop for all arguments */
-#endif
+ xchgl %ebx,%esp /* switch to kernel stack */
-/*
- * Register use on entry:
- * eax contains syscall number << 4
- * mach_call_munger is declared regparm(1), so the first arg is %eax
- */
-2:
+ sti
+ movl %gs:CPU_ACTIVE_THREAD,%ecx /* get current thread */
+ movl ACT_TASK(%ecx),%ecx /* point to current task */
+ addl $1,TASK_SYSCALLS_UNIX(%ecx) /* increment call count */
- call EXT(mach_call_munger)
+ CCALL1(unix_syscall, %ebx)
+ /*
+ * always returns through thread_exception_return
+ */
- movl %esp,%ecx /* get kernel stack */
- or $(KERNEL_STACK_SIZE-1),%ecx
- movl -3-IKS_SIZE(%ecx),%esp /* switch back to PCB stack */
- movl %eax,R_EAX(%esp) /* save return value */
- jmp EXT(return_from_trap) /* return to user */
-
-/*
- * Special system call entry for "int 0x80", which has the "eflags"
- * register saved at the right place already.
- * Fall back to the common syscall path after saving the registers.
- *
- * esp -> old eip
- * old cs
- * old eflags
- * old esp if trapped from user
- * old ss if trapped from user
- *
- * XXX: for the moment, we don't check for int 0x80 from kernel mode.
- */
-Entry(syscall_int80)
- pushl %eax /* save system call number */
- pushl $0 /* clear trap number slot */
+Entry(lo_mach_scall)
+ TIME_TRAP_UENTRY
- pusha /* save the general registers */
- pushl %ds /* and the segment registers */
- pushl %es
- pushl %fs
- pushl %gs
+ movl %gs:CPU_KERNEL_STACK,%ebx
+ xchgl %ebx,%esp /* switch to kernel stack */
- mov %ss,%dx /* switch to kernel data segment */
- mov %dx,%ds
- mov %dx,%es
- mov $ CPU_DATA_GS,%dx
- mov %dx,%gs
+ sti
+ movl %gs:CPU_ACTIVE_THREAD,%ecx /* get current thread */
+ movl ACT_TASK(%ecx),%ecx /* point to current task */
+ addl $1,TASK_SYSCALLS_MACH(%ecx) /* increment call count */
- jmp syscall_entry_3
+ CCALL1(mach_call_munger, %ebx)
+ /*
+ * always returns through thread_exception_return
+ */
-/*
- * System call enters through a call gate. Flags are not saved -
- * we must shuffle stack to look like trap save area.
- *
- * esp-> old eip
- * old cs
- * old esp
- * old ss
- *
- * eax contains system call number.
- *
- * NB: below use of CPU_NUMBER assumes that macro will use correct
- * correct segment register for any kernel data accesses.
- */
-Entry(syscall)
-syscall_entry:
- pushf /* save flags as soon as possible */
-syscall_entry_2:
- pushl %eax /* save system call number */
- pushl $0 /* clear trap number slot */
-
- pusha /* save the general registers */
- pushl %ds /* and the segment registers */
- pushl %es
- pushl %fs
- pushl %gs
-
- mov %ss,%dx /* switch to kernel data segment */
- mov %dx,%ds
- mov %dx,%es
- mov $ CPU_DATA_GS,%dx
- mov %dx,%gs
+
+Entry(lo_mdep_scall)
+ TIME_TRAP_UENTRY
-/*
- * Shuffle eflags,eip,cs into proper places
- */
+ movl %gs:CPU_KERNEL_STACK,%ebx
+ xchgl %ebx,%esp /* switch to kernel stack */
- movl R_EIP(%esp),%ebx /* eflags are in EIP slot */
- movl R_CS(%esp),%ecx /* eip is in CS slot */
- movl R_EFLAGS(%esp),%edx /* cs is in EFLAGS slot */
- movl %ecx,R_EIP(%esp) /* fix eip */
- movl %edx,R_CS(%esp) /* fix cs */
- movl %ebx,R_EFLAGS(%esp) /* fix eflags */
+ sti
-syscall_entry_3:
-/*
- * Check here for syscall from kernel-loaded task --
- * We didn't enter here "through" PCB (i.e., using ring 0 stack),
- * so transfer the stack frame into the PCB explicitly, then
- * start running on resulting "PCB stack". We have to set
- * up a simulated "uesp" manually, since there's none in the
- * frame.
- */
- cmpl $0,%gs:CPU_ACTIVE_KLOADED
- jz 0f
- CAH(scstart)
- movl %gs:CPU_ACTIVE_KLOADED,%ebx
- movl %gs:CPU_KERNEL_STACK,%edx
- xchgl %edx,%esp
- FRAME_STACK_TO_PCB(%ebx,%edx)
- CAH(scend)
- TIME_TRAP_UENTRY
- jmp 1f
+ CCALL1(machdep_syscall, %ebx)
+ /*
+ * always returns through thread_exception_return
+ */
+
-0:
+Entry(lo_diag_scall)
TIME_TRAP_UENTRY
- movl %gs:CPU_KERNEL_STACK,%ebx
- /* get current kernel stack */
- xchgl %ebx,%esp /* switch stacks - %ebx points to */
- /* user registers. */
- /* user regs pointer already set */
-
-/*
- * Native system call.
- * Register use on entry:
- * eax contains syscall number
- * ebx points to user regs
- */
-1:
- negl %eax /* get system call number */
- jl mach_call_range /* out of range if it was positive */
-
- cmpl EXT(mach_trap_count),%eax /* check system call table bounds */
- jg mach_call_range /* error if out of range */
- shll $4,%eax /* manual indexing */
+ movl %gs:CPU_KERNEL_STACK,%ebx // Get the address of the kernel stack
+ xchgl %ebx,%esp // Switch to it, saving the previous
- movl EXT(mach_trap_table)+4(%eax),%edx
- /* get procedure */
- cmpl $ EXT(kern_invalid),%edx /* if not "kern_invalid" */
- jne do_native_call /* go on with Mach syscall */
- shrl $4,%eax /* restore syscall number */
- jmp mach_call_range /* try it as a "server" syscall */
+ CCALL1(diagCall, %ebx) // Call diagnostics
+ cli // Disable interruptions just in case they were enabled
+ popl %esp // Get back the original stack
+
+ cmpl $0,%eax // What kind of return is this?
+ jne EXT(return_to_user) // Normal return, do not check asts...
+
+ CCALL3(i386_exception, $EXC_SYSCALL, $0x6000, $1)
+ // pass what would be the diag syscall
+ // error return - cause an exception
+ /* no return */
+
-/*
- * Register use on entry:
- * eax contains syscall number
- * ebx contains user regs pointer
- */
-do_native_call:
- movl EXT(mach_trap_table)(%eax),%ecx
- /* get number of arguments */
- jecxz mach_call_call /* skip argument copy if none */
- movl R_UESP(%ebx),%esi /* get user stack pointer */
- lea 4(%esi,%ecx,4),%esi /* skip user return address, */
- /* and point past last argument */
- movl %gs:CPU_ACTIVE_KLOADED,%edx
- /* point to current thread */
- orl %edx,%edx /* if kernel-loaded, skip addr check */
- jz 0f /* else */
- mov %ds,%dx /* kernel data segment access */
- jmp 1f
-0:
- cmpl $(VM_MAX_ADDRESS),%esi /* in user space? */
- ja mach_call_addr /* address error if not */
- movl $ USER_DS,%edx /* user data segment access */
-1:
- mov %dx,%fs
- movl %esp,%edx /* save kernel ESP for error recovery */
-2:
- subl $4,%esi
- RECOVERY_SECTION
- RECOVER(mach_call_addr_push)
- pushl %fs:(%esi) /* push argument on stack */
- loop 2b /* loop for all arguments */
-/*
- * Register use on entry:
- * eax contains syscall number
- * ebx contains user regs pointer
+/*******************************************************************************************************
+ *
+ * 64bit Tasks
+ * System call entries via syscall only:
+ *
+ * esp -> x86_saved_state64_t
+ * cr3 -> kernel directory
+ * esp -> low based stack
+ * gs -> CPU_DATA_GS
+ * cs -> KERNEL_CS
+ * ss/ds/es -> KERNEL_DS
+ *
+ * interrupts disabled
+ * direction flag cleared
*/
-mach_call_call:
- CAH(call_call)
+Entry(lo_syscall)
+ /*
+ * We can be here either for a mach, unix machdep or diag syscall,
+ * as indicated by the syscall class:
+ */
+ movl R64_RAX(%esp), %eax /* syscall number/class */
+ movl %eax, %ebx
+ andl $(SYSCALL_CLASS_MASK), %ebx /* syscall class */
+ cmpl $(SYSCALL_CLASS_MACH<<SYSCALL_CLASS_SHIFT), %ebx
+ je EXT(lo64_mach_scall)
+ cmpl $(SYSCALL_CLASS_UNIX<<SYSCALL_CLASS_SHIFT), %ebx
+ je EXT(lo64_unix_scall)
+ cmpl $(SYSCALL_CLASS_MDEP<<SYSCALL_CLASS_SHIFT), %ebx
+ je EXT(lo64_mdep_scall)
+ cmpl $(SYSCALL_CLASS_DIAG<<SYSCALL_CLASS_SHIFT), %ebx
+ je EXT(lo64_diag_scall)
+
+ /* Syscall class unknown */
+ CCALL3(i386_exception, $(EXC_SYSCALL), %eax, $1)
+ /* no return */
-#if ETAP_EVENT_MONITOR
- cmpl $0x200, %eax /* is this mach_msg? */
- jz make_syscall /* if yes, don't record event */
+Entry(lo64_unix_scall)
+ TIME_TRAP_UENTRY
- pushal /* Otherwise: save registers */
- pushl %eax /* push syscall number on stack*/
- call EXT(etap_machcall_probe1) /* call event begin probe */
- add $4,%esp /* restore stack */
- popal /* restore registers */
+ movl %gs:CPU_KERNEL_STACK,%ebx
+ xchgl %ebx,%esp /* switch to kernel stack */
- call *EXT(mach_trap_table)+4(%eax) /* call procedure */
- pushal
- call EXT(etap_machcall_probe2) /* call event end probe */
- popal
- jmp skip_syscall /* syscall already made */
-#endif /* ETAP_EVENT_MONITOR */
+ sti
+ movl %gs:CPU_ACTIVE_THREAD,%ecx /* get current thread */
+ movl ACT_TASK(%ecx),%ecx /* point to current task */
+ addl $1,TASK_SYSCALLS_UNIX(%ecx) /* increment call count */
-make_syscall:
+ CCALL1(unix_syscall64, %ebx)
+ /*
+ * always returns through thread_exception_return
+ */
+
-/*
- * mach_call_munger is declared regparm(1) so the first arg is %eax
- */
- call EXT(mach_call_munger)
+Entry(lo64_mach_scall)
+ TIME_TRAP_UENTRY
-skip_syscall:
+ movl %gs:CPU_KERNEL_STACK,%ebx
+ xchgl %ebx,%esp /* switch to kernel stack */
- movl %esp,%ecx /* get kernel stack */
- or $(KERNEL_STACK_SIZE-1),%ecx
- movl -3-IKS_SIZE(%ecx),%esp /* switch back to PCB stack */
- movl %eax,R_EAX(%esp) /* save return value */
- jmp EXT(return_from_trap) /* return to user */
+ sti
+ movl %gs:CPU_ACTIVE_THREAD,%ecx /* get current thread */
+ movl ACT_TASK(%ecx),%ecx /* point to current task */
+ addl $1,TASK_SYSCALLS_MACH(%ecx) /* increment call count */
-/*
- * Address out of range. Change to page fault.
- * %esi holds failing address.
- * Register use on entry:
- * ebx contains user regs pointer
- */
-mach_call_addr_push:
- movl %edx,%esp /* clean parameters from stack */
-mach_call_addr:
- movl %esi,R_CR2(%ebx) /* set fault address */
- movl $(T_PAGE_FAULT),R_TRAPNO(%ebx)
- /* set page-fault trap */
- movl $(T_PF_USER),R_ERR(%ebx)
- /* set error code - read user space */
- CAH(call_addr)
- jmp EXT(take_trap) /* treat as a trap */
+ CCALL1(mach_call_munger64, %ebx)
+ /*
+ * always returns through thread_exception_return
+ */
-/*
- * System call out of range. Treat as invalid-instruction trap.
- * (? general protection?)
- * Register use on entry:
- * eax contains syscall number
- */
-mach_call_range:
- push %eax
- movl %esp,%edx
- push $1 /* code_cnt = 1 */
- push %edx /* exception_type_t (see i/f docky) */
- push $ EXC_SYSCALL
- CAH(call_range)
- call EXT(exception_triage)
- /* no return */
+
+Entry(lo64_mdep_scall)
+ TIME_TRAP_UENTRY
- .globl EXT(syscall_failed)
-LEXT(syscall_failed)
- movl %esp,%ecx /* get kernel stack */
- or $(KERNEL_STACK_SIZE-1),%ecx
- movl -3-IKS_SIZE(%ecx),%esp /* switch back to PCB stack */
movl %gs:CPU_KERNEL_STACK,%ebx
- /* get current kernel stack */
- xchgl %ebx,%esp /* switch stacks - %ebx points to */
- /* user registers. */
- /* user regs pointer already set */
+ xchgl %ebx,%esp /* switch to kernel stack */
+
+ sti
+
+ CCALL1(machdep_syscall64, %ebx)
+ /*
+ * always returns through thread_exception_return
+ */
+
+
+Entry(lo64_diag_scall)
+ TIME_TRAP_UENTRY
- movl $(T_INVALID_OPCODE),R_TRAPNO(%ebx)
- /* set invalid-operation trap */
- movl $0,R_ERR(%ebx) /* clear error code */
- CAH(failed)
- jmp EXT(take_trap) /* treat as a trap */
+ movl %gs:CPU_KERNEL_STACK,%ebx // Get the address of the kernel stack
+ xchgl %ebx,%esp // Switch to it, saving the previous
+
+ pushl %ebx // Push the previous stack
+ CCALL1(diagCall64, %ebx) // Call diagnostics
+ cli // Disable interruptions just in case they were enabled
+ popl %esp // Get back the original stack
+
+ cmpl $0,%eax // What kind of return is this?
+ jne EXT(return_to_user) // Normal return, do not check asts...
+
+ CCALL3(i386_exception, $EXC_SYSCALL, $0x6000, $1)
+ /* no return */
+
+
+/******************************************************************************************************
+
/*\f*/
/*
* Utility routines.
/*
- * Copy from user address space.
- * arg0: user address
+ * Copy from user/kernel address space.
+ * arg0: window offset or kernel address
* arg1: kernel address
* arg2: byte count
*/
-Entry(copyinmsg)
-ENTRY(copyin)
+ENTRY(copyinphys_user)
+ movl $(USER_WINDOW_SEL),%ecx /* user data segment access through kernel window */
+ mov %cx,%ds
+
+ENTRY(copyinphys_kern)
+ movl $(PHYS_WINDOW_SEL),%ecx /* physical access through kernel window */
+ mov %cx,%es
+ jmp copyin_common
+
+ENTRY(copyin_user)
+ movl $(USER_WINDOW_SEL),%ecx /* user data segment access through kernel window */
+ mov %cx,%ds
+
+ENTRY(copyin_kern)
+
+copyin_common:
pushl %esi
pushl %edi /* save registers */
- movl 8+S_ARG0,%esi /* get user start address */
- movl 8+S_ARG1,%edi /* get kernel destination address */
+ movl 8+S_ARG0,%esi /* get source - window offset or kernel address */
+ movl 8+S_ARG1,%edi /* get destination - kernel address */
movl 8+S_ARG2,%edx /* get count */
- lea 0(%esi,%edx),%eax /* get user end address + 1 */
-
- movl %gs:CPU_ACTIVE_THREAD,%ecx /* get active thread */
- movl ACT_MAP(%ecx),%ecx /* get act->map */
- movl MAP_PMAP(%ecx),%ecx /* get map->pmap */
- cmpl EXT(kernel_pmap), %ecx
- jz 1f
- movl $ USER_DS,%ecx /* user data segment access */
- mov %cx,%ds
-1:
- cmpl %esi,%eax
- jb copyin_fail /* fail if wrap-around */
cld /* count up */
movl %edx,%ecx /* move by longwords first */
shrl $2,%ecx
rep
movsb
xorl %eax,%eax /* return 0 for success */
-copy_ret:
- mov %ss,%di /* restore kernel data segment */
- mov %di,%ds
+copyin_ret:
+ mov %ss,%cx /* restore kernel data and extended segments */
+ mov %cx,%ds
+ mov %cx,%es
popl %edi /* restore registers */
popl %esi
ret /* and return */
copyin_fail:
- movl $ EFAULT,%eax /* return error for failure */
- jmp copy_ret /* pop frame and return */
+ movl $(EFAULT),%eax /* return error for failure */
+ jmp copyin_ret /* pop frame and return */
+
+
/*
- * Copy string from user address space.
- * arg0: user address
+ * Copy string from user/kern address space.
+ * arg0: window offset or kernel address
* arg1: kernel address
* arg2: max byte count
* arg3: actual byte count (OUT)
*/
-Entry(copyinstr)
+Entry(copyinstr_kern)
+ mov %ds,%cx
+ jmp copyinstr_common
+
+Entry(copyinstr_user)
+ movl $(USER_WINDOW_SEL),%ecx /* user data segment access through kernel window */
+
+copyinstr_common:
+ mov %cx,%fs
+
pushl %esi
pushl %edi /* save registers */
- movl 8+S_ARG0,%esi /* get user start address */
- movl 8+S_ARG1,%edi /* get kernel destination address */
+ movl 8+S_ARG0,%esi /* get source - window offset or kernel address */
+ movl 8+S_ARG1,%edi /* get destination - kernel address */
movl 8+S_ARG2,%edx /* get count */
- lea 0(%esi,%edx),%eax /* get user end address + 1 */
-
- movl %gs:CPU_ACTIVE_THREAD,%ecx /* get active thread */
- movl ACT_MAP(%ecx),%ecx /* get act->map */
- movl MAP_PMAP(%ecx),%ecx /* get map->pmap */
- cmpl EXT(kernel_pmap), %ecx
- jne 0f
- mov %ds,%cx /* kernel data segment access */
- jmp 1f
-0:
- movl $ USER_DS,%ecx /* user data segment access */
-1:
- mov %cx,%fs
- xorl %eax,%eax
- cmpl $0,%edx
- je 4f
+ xorl %eax,%eax /* set to 0 here so that the high 24 bits */
+ /* are 0 for the cmpl against 0 */
2:
RECOVERY_SECTION
RECOVER(copystr_fail) /* copy bytes... */
movb %al,(%edi) /* copy the byte */
incl %edi
3:
- decl %edx
- je 5f /* Zero count.. error out */
- cmpl $0,%eax
- jne 2b /* .. a NUL found? */
- jmp 4f /* return zero (%eax) */
-5:
- movl $ ENAMETOOLONG,%eax /* String is too long.. */
+ testl %eax,%eax /* did we just stuff the 0-byte? */
+ jz 4f /* yes, return 0 status already in %eax */
+ decl %edx /* decrement #bytes left in buffer */
+ jnz 2b /* buffer not full so copy in another byte */
+ movl $(ENAMETOOLONG),%eax /* buffer full but no 0-byte: ENAMETOOLONG */
4:
movl 8+S_ARG3,%edi /* get OUT len ptr */
cmpl $0,%edi
ret /* and return */
copystr_fail:
- movl $ EFAULT,%eax /* return error for failure */
- jmp copy_ret /* pop frame and return */
+ movl $(EFAULT),%eax /* return error for failure */
+ jmp copystr_ret /* pop frame and return */
+
/*
- * Copy to user address space.
+ * Copy to user/kern address space.
* arg0: kernel address
- * arg1: user address
+ * arg1: window offset or kernel address
* arg2: byte count
*/
-Entry(copyoutmsg)
-ENTRY(copyout)
- pushl %esi
- pushl %edi /* save registers */
- pushl %ebx
-
- movl 12+S_ARG0,%esi /* get kernel start address */
- movl 12+S_ARG1,%edi /* get user start address */
- movl 12+S_ARG2,%edx /* get count */
+ENTRY(copyoutphys_user)
+ movl $(USER_WINDOW_SEL),%ecx /* user data segment access through kernel window */
+ mov %cx,%es
- leal 0(%edi,%edx),%eax /* get user end address + 1 */
+ENTRY(copyoutphys_kern)
+ movl $(PHYS_WINDOW_SEL),%ecx /* physical access through kernel window */
+ mov %cx,%ds
+ jmp copyout_common
- movl %gs:CPU_ACTIVE_THREAD,%ecx /* get active thread */
- movl ACT_MAP(%ecx),%ecx /* get act->map */
- movl MAP_PMAP(%ecx),%ecx /* get map->pmap */
- cmpl EXT(kernel_pmap), %ecx
- jne 0f
- mov %ds,%cx /* else kernel data segment access */
- jmp 1f
-0:
- movl $ USER_DS,%ecx
-1:
+ENTRY(copyout_user)
+ movl $(USER_WINDOW_SEL),%ecx /* user data segment access through kernel window */
mov %cx,%es
-/*
- * Check whether user address space is writable
- * before writing to it - hardware is broken.
- *
- * Skip check if "user" address is really in
- * kernel space (i.e., if it's in a kernel-loaded
- * task).
- *
- * Register usage:
- * esi/edi source/dest pointers for rep/mov
- * ecx counter for rep/mov
- * edx counts down from 3rd arg
- * eax count of bytes for each (partial) page copy
- * ebx shadows edi, used to adjust edx
- */
- movl %edi,%ebx /* copy edi for syncing up */
-copyout_retry:
- /* if restarting after a partial copy, put edx back in sync, */
- addl %ebx,%edx /* edx -= (edi - ebx); */
- subl %edi,%edx
- movl %edi,%ebx /* ebx = edi; */
+ENTRY(copyout_kern)
+
+copyout_common:
+ pushl %esi
+ pushl %edi /* save registers */
+
+ movl 8+S_ARG0,%esi /* get source - kernel address */
+ movl 8+S_ARG1,%edi /* get destination - window offset or kernel address */
+ movl 8+S_ARG2,%edx /* get count */
-/*
- * Copy only what fits on the current destination page.
- * Check for write-fault again on the next page.
- */
- leal NBPG(%edi),%eax /* point to */
- andl $(-NBPG),%eax /* start of next page */
- subl %edi,%eax /* get number of bytes to that point */
- cmpl %edx,%eax /* bigger than count? */
- jle 1f /* if so, */
- movl %edx,%eax /* use count */
-1:
cld /* count up */
- movl %eax,%ecx /* move by longwords first */
+ movl %edx,%ecx /* move by longwords first */
shrl $2,%ecx
RECOVERY_SECTION
RECOVER(copyout_fail)
- RETRY_SECTION
- RETRY(copyout_retry)
rep
movsl
- movl %eax,%ecx /* now move remaining bytes */
+ movl %edx,%ecx /* now move remaining bytes */
andl $3,%ecx
RECOVERY_SECTION
RECOVER(copyout_fail)
- RETRY_SECTION
- RETRY(copyout_retry)
rep
movsb /* move */
- movl %edi,%ebx /* copy edi for syncing up */
- subl %eax,%edx /* and decrement count */
- jg copyout_retry /* restart on next page if not done */
xorl %eax,%eax /* return 0 for success */
copyout_ret:
- mov %ss,%di /* restore kernel segment */
- mov %di,%es
+ mov %ss,%cx /* restore kernel segment */
+ mov %cx,%es
+ mov %cx,%ds
- popl %ebx
popl %edi /* restore registers */
popl %esi
ret /* and return */
copyout_fail:
- movl $ EFAULT,%eax /* return error for failure */
+ movl $(EFAULT),%eax /* return error for failure */
jmp copyout_ret /* pop frame and return */
-/*
- * FPU routines.
- */
-
-/*
- * Initialize FPU.
- */
-ENTRY(_fninit)
- fninit
- ret
-
-/*
- * Read control word
- */
-ENTRY(_fstcw)
- pushl %eax /* get stack space */
- fstcw (%esp)
- popl %eax
- ret
-
-/*
- * Set control word
- */
-ENTRY(_fldcw)
- fldcw 4(%esp)
- ret
-
-/*
- * Read status word
- */
-ENTRY(_fnstsw)
- xor %eax,%eax /* clear high 16 bits of eax */
- fnstsw %ax /* read FP status */
- ret
-
-/*
- * Clear FPU exceptions
- */
-ENTRY(_fnclex)
- fnclex
- ret
-
-/*
- * Clear task-switched flag.
- */
-ENTRY(_clts)
- clts
- ret
-
-/*
- * Save complete FPU state. Save error for later.
- */
-ENTRY(_fpsave)
- movl 4(%esp),%eax /* get save area pointer */
- fnsave (%eax) /* save complete state, including */
- /* errors */
- ret
-
-/*
- * Restore FPU state.
- */
-ENTRY(_fprestore)
- movl 4(%esp),%eax /* get save area pointer */
- frstor (%eax) /* restore complete state */
- ret
-
-/*
- * Set cr3
- */
-ENTRY(set_cr3)
- CPU_NUMBER(%eax)
- orl 4(%esp), %eax
- /*
- * Don't set PDBR to a new value (hence invalidating the
- * "paging cache") if the new value matches the current one.
- */
- movl %cr3,%edx /* get current cr3 value */
- cmpl %eax,%edx
- je 0f /* if two are equal, don't set */
- movl %eax,%cr3 /* load it (and flush cache) */
-0:
- ret
-
-/*
- * Read cr3
- */
-ENTRY(get_cr3)
- movl %cr3,%eax
- andl $(~0x7), %eax /* remove cpu number */
- ret
-
-/*
- * Flush TLB
- */
-ENTRY(flush_tlb)
- movl %cr3,%eax /* flush tlb by reloading CR3 */
- movl %eax,%cr3 /* with itself */
- ret
-
-/*
- * Read cr2
- */
-ENTRY(get_cr2)
- movl %cr2,%eax
- ret
-
-/*
- * Read cr4
- */
-ENTRY(get_cr4)
- .byte 0x0f,0x20,0xe0 /* movl %cr4, %eax */
- ret
-
-/*
- * Write cr4
- */
-ENTRY(set_cr4)
- movl 4(%esp), %eax
- .byte 0x0f,0x22,0xe0 /* movl %eax, %cr4 */
- ret
-
-/*
- * Read ldtr
- */
-Entry(get_ldt)
- xorl %eax,%eax
- sldt %ax
- ret
-
-/*
- * Set ldtr
- */
-Entry(set_ldt)
- lldt 4(%esp)
- ret
-
-/*
- * Read task register.
- */
-ENTRY(get_tr)
- xorl %eax,%eax
- str %ax
- ret
-
-/*
- * Set task register. Also clears busy bit of task descriptor.
- */
-ENTRY(set_tr)
- movl S_ARG0,%eax /* get task segment number */
- subl $8,%esp /* push space for SGDT */
- sgdt 2(%esp) /* store GDT limit and base (linear) */
- movl 4(%esp),%edx /* address GDT */
- movb $(K_TSS),5(%edx,%eax) /* fix access byte in task descriptor */
- ltr %ax /* load task register */
- addl $8,%esp /* clear stack */
- ret /* and return */
-
-/*
- * Set task-switched flag.
- */
-ENTRY(_setts)
- movl %cr0,%eax /* get cr0 */
- orl $(CR0_TS),%eax /* or in TS bit */
- movl %eax,%cr0 /* set cr0 */
- ret
/*
* io register must not be used on slaves (no AT bus)
POP_FRAME
ret
-
-/*
- * int inst_fetch(int eip, int cs);
- *
- * Fetch instruction byte. Return -1 if invalid address.
- */
- .globl EXT(inst_fetch)
-LEXT(inst_fetch)
- movl S_ARG1, %eax /* get segment */
- movw %ax,%fs /* into FS */
- movl S_ARG0, %eax /* get offset */
- RETRY_SECTION
- RETRY(EXT(inst_fetch)) /* re-load FS on retry */
- RECOVERY_SECTION
- RECOVER(EXT(inst_fetch_fault))
- movzbl %fs:(%eax),%eax /* load instruction byte */
- ret
-
-LEXT(inst_fetch_fault)
- movl $-1,%eax /* return -1 if error */
- ret
-
-
-#if MACH_KDP
-/*
- * kdp_copy_kmem(char *src, char *dst, int count)
- *
- * Similar to copyin except that both addresses are kernel addresses.
- */
-
-ENTRY(kdp_copy_kmem)
- pushl %esi
- pushl %edi /* save registers */
-
- movl 8+S_ARG0,%esi /* get kernel start address */
- movl 8+S_ARG1,%edi /* get kernel destination address */
-
- movl 8+S_ARG2,%edx /* get count */
-
- lea 0(%esi,%edx),%eax /* get kernel end address + 1 */
-
- cmpl %esi,%eax
- jb kdp_vm_read_fail /* fail if wrap-around */
- cld /* count up */
- movl %edx,%ecx /* move by longwords first */
- shrl $2,%ecx
- RECOVERY_SECTION
- RECOVER(kdp_vm_read_fail)
- rep
- movsl /* move longwords */
- movl %edx,%ecx /* now move remaining bytes */
- andl $3,%ecx
- RECOVERY_SECTION
- RECOVER(kdp_vm_read_fail)
- rep
- movsb
-kdp_vm_read_done:
- movl 8+S_ARG2,%edx /* get count */
- subl %ecx,%edx /* Return number of bytes transfered */
- movl %edx,%eax
-
- popl %edi /* restore registers */
- popl %esi
- ret /* and return */
-
-kdp_vm_read_fail:
- xorl %eax,%eax /* didn't copy a thing. */
-
- popl %edi
- popl %esi
- ret
-#endif
-
/*
* int rdmsr_carefully(uint32_t msr, uint32_t *lo, uint32_t *hi)
*/
ret
/*
- * Done with recovery and retry tables.
+ * Done with recovery table.
*/
RECOVERY_SECTION
RECOVER_TABLE_END
- RETRY_SECTION
- RETRY_TABLE_END
ENTRY(dr_addr)
.long 0,0,0,0
.long 0,0,0,0
+
.text
ENTRY(get_cr0)
movl 4(%ebp),%eax
ret
-#if ETAP
-
-ENTRY(etap_get_pc)
- movl 4(%ebp), %eax /* fetch pc of caller */
- ret
-
-ENTRY(tvals_to_etap)
- movl S_ARG0, %eax
- movl $1000000000, %ecx
- mull %ecx
- addl S_ARG1, %eax
- adc $0, %edx
- ret
-
-/* etap_time_t
- * etap_time_sub(etap_time_t stop, etap_time_t start)
- *
- * 64bit subtract, returns stop - start
- */
-ENTRY(etap_time_sub)
- movl S_ARG0, %eax /* stop.low */
- movl S_ARG1, %edx /* stop.hi */
- subl S_ARG2, %eax /* stop.lo - start.lo */
- sbbl S_ARG3, %edx /* stop.hi - start.hi */
- ret
-
-#endif /* ETAP */
-
ENTRY(minsecurity)
pushl %ebp
movl %esp,%ebp
POP_FRAME
ret
-#ifdef MACH_BSD
-/*
- * BSD System call entry point..
- */
-
-Entry(trap_unix_syscall)
-trap_unix_addr:
- pushf /* save flags as soon as possible */
-trap_unix_2:
- pushl %eax /* save system call number */
- pushl $0 /* clear trap number slot */
-
- pusha /* save the general registers */
- pushl %ds /* and the segment registers */
- pushl %es
- pushl %fs
- pushl %gs
-
- mov %ss,%dx /* switch to kernel data segment */
- mov %dx,%ds
- mov %dx,%es
- mov $ CPU_DATA_GS,%dx
- mov %dx,%gs
-
-/*
- * Shuffle eflags,eip,cs into proper places
- */
-
- movl R_EIP(%esp),%ebx /* eflags are in EIP slot */
- movl R_CS(%esp),%ecx /* eip is in CS slot */
- movl R_EFLAGS(%esp),%edx /* cs is in EFLAGS slot */
- movl %ecx,R_EIP(%esp) /* fix eip */
- movl %edx,R_CS(%esp) /* fix cs */
- movl %ebx,R_EFLAGS(%esp) /* fix eflags */
-
- TIME_TRAP_UENTRY
-
- negl %eax /* get system call number */
- shll $4,%eax /* manual indexing */
-
- movl %gs:CPU_KERNEL_STACK,%ebx
- /* get current kernel stack */
- xchgl %ebx,%esp /* switch stacks - %ebx points to */
- /* user registers. */
-
-/*
- * Register use on entry:
- * eax contains syscall number
- * ebx contains user regs pointer
- */
- CAH(call_call)
- pushl %ebx /* Push the regs set onto stack */
- call EXT(unix_syscall)
- popl %ebx
- movl %esp,%ecx /* get kernel stack */
- or $(KERNEL_STACK_SIZE-1),%ecx
- movl -3-IKS_SIZE(%ecx),%esp /* switch back to PCB stack */
- movl %eax,R_EAX(%esp) /* save return value */
- jmp EXT(return_from_trap) /* return to user */
+
/*
- * Entry point for machdep system calls..
+ * Double-fault exception handler task. The last gasp...
*/
+Entry(df_task_start)
+ CCALL1(panic_double_fault, $(T_DOUBLE_FAULT))
+ hlt
-Entry(trap_machdep_syscall)
- pushf /* save flags as soon as possible */
- pushl %eax /* save system call number */
- pushl $0 /* clear trap number slot */
-
- pusha /* save the general registers */
- pushl %ds /* and the segment registers */
- pushl %es
- pushl %fs
- pushl %gs
-
- mov %ss,%dx /* switch to kernel data segment */
- mov %dx,%ds
- mov %dx,%es
- mov $ CPU_DATA_GS,%dx
- mov %dx,%gs
/*
- * Shuffle eflags,eip,cs into proper places
+ * machine-check handler task. The last gasp...
*/
-
- movl R_EIP(%esp),%ebx /* eflags are in EIP slot */
- movl R_CS(%esp),%ecx /* eip is in CS slot */
- movl R_EFLAGS(%esp),%edx /* cs is in EFLAGS slot */
- movl %ecx,R_EIP(%esp) /* fix eip */
- movl %edx,R_CS(%esp) /* fix cs */
- movl %ebx,R_EFLAGS(%esp) /* fix eflags */
-
- TIME_TRAP_UENTRY
-
- negl %eax /* get system call number */
- shll $4,%eax /* manual indexing */
-
- movl %gs:CPU_KERNEL_STACK,%ebx
- /* get current kernel stack */
- xchgl %ebx,%esp /* switch stacks - %ebx points to */
- /* user registers. */
-
-/*
- * Register use on entry:
- * eax contains syscall number
- * ebx contains user regs pointer
- */
- CAH(call_call)
- pushl %ebx
- call EXT(machdep_syscall)
- popl %ebx
- movl %esp,%ecx /* get kernel stack */
- or $(KERNEL_STACK_SIZE-1),%ecx
- movl -3-IKS_SIZE(%ecx),%esp /* switch back to PCB stack */
- movl %eax,R_EAX(%esp) /* save return value */
- jmp EXT(return_from_trap) /* return to user */
-
-Entry(trap_mach25_syscall)
- pushf /* save flags as soon as possible */
- pushl %eax /* save system call number */
- pushl $0 /* clear trap number slot */
-
- pusha /* save the general registers */
- pushl %ds /* and the segment registers */
- pushl %es
- pushl %fs
- pushl %gs
-
- mov %ss,%dx /* switch to kernel data segment */
- mov %dx,%ds
- mov %dx,%es
- mov $ CPU_DATA_GS,%dx
- mov %dx,%gs
+Entry(mc_task_start)
+ CCALL1(panic_machine_check, $(T_MACHINE_CHECK))
+ hlt
/*
- * Shuffle eflags,eip,cs into proper places
+ * Compatibility mode's last gasp...
*/
+Entry(lo_df64)
+ movl %esp, %eax
+ CCALL1(panic_double_fault64, %eax)
+ hlt
- movl R_EIP(%esp),%ebx /* eflags are in EIP slot */
- movl R_CS(%esp),%ecx /* eip is in CS slot */
- movl R_EFLAGS(%esp),%edx /* cs is in EFLAGS slot */
- movl %ecx,R_EIP(%esp) /* fix eip */
- movl %edx,R_CS(%esp) /* fix cs */
- movl %ebx,R_EFLAGS(%esp) /* fix eflags */
+Entry(lo_mc64)
+ movl %esp, %eax
+ CCALL1(panic_machine_check64, %eax)
+ hlt
- TIME_TRAP_UENTRY
-
- negl %eax /* get system call number */
- shll $4,%eax /* manual indexing */
-
- movl %gs:CPU_KERNEL_STACK,%ebx
- /* get current kernel stack */
- xchgl %ebx,%esp /* switch stacks - %ebx points to */
- /* user registers. */
-
-/*
- * Register use on entry:
- * eax contains syscall number
- * ebx contains user regs pointer
- */
- CAH(call_call)
- pushl %ebx
- call EXT(mach25_syscall)
- popl %ebx
- movl %esp,%ecx /* get kernel stack */
- or $(KERNEL_STACK_SIZE-1),%ecx
- movl -3-IKS_SIZE(%ecx),%esp /* switch back to PCB stack */
- movl %eax,R_EAX(%esp) /* save return value */
- jmp EXT(return_from_trap) /* return to user */
-
-#endif
projects / apple / xnu.git / blobdiff