/*
- * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2016 Apple Inc. All rights reserved.
*
* @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
* 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,
* 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_OSREFERENCE_LICENSE_HEADER_END@
*/
#include <kern/task.h>
#include <kern/clock.h>
#include <kern/locks.h>
#include <kern/sched_prim.h>
+#include <kern/debug.h>
#include <mach/machine/thread_status.h>
#include <mach/thread_act.h>
#include <sys/systm.h>
#include <sys/user.h>
#include <sys/errno.h>
-#include <sys/ktrace.h>
#include <sys/kdebug.h>
#include <sys/sysent.h>
#include <sys/sysproto.h>
#include <sys/kauth.h>
#include <sys/systm.h>
+#include <sys/bitstring.h>
-#include <bsm/audit_kernel.h>
+#include <security/audit/audit.h>
#include <i386/seg.h>
#include <i386/machine_routines.h>
#include <mach/i386/syscall_sw.h>
+#include <machine/pal_routines.h>
+
+#if CONFIG_MACF
+#include <security/mac_framework.h>
+#endif
+
+#if CONFIG_DTRACE
+extern int32_t dtrace_systrace_syscall(struct proc *, void *, int *);
+extern void dtrace_systrace_syscall_return(unsigned short, int, int *);
+#endif
+
extern void unix_syscall(x86_saved_state_t *);
extern void unix_syscall64(x86_saved_state_t *);
-extern void unix_syscall_return(int);
extern void *find_user_regs(thread_t);
-extern void IOSleep(int);
-extern void exit_funnel_section(void);
-extern void Debugger(const char * message);
+/* dynamically generated at build time based on syscalls.master */
+extern const char *syscallnames[];
+
+#define code_is_kdebug_trace(code) (((code) == SYS_kdebug_trace) || \
+ ((code) == SYS_kdebug_trace64) || \
+ ((code) == SYS_kdebug_trace_string))
/*
* Function: unix_syscall
*
* Outputs: none
*/
+__attribute__((noreturn))
void
unix_syscall(x86_saved_state_t *state)
{
- thread_t thread;
- void *vt;
- unsigned short code;
- struct sysent *callp;
- int nargs;
- int error;
- int funnel_type;
- vm_offset_t params;
- struct proc *p;
- struct uthread *uthread;
- unsigned int cancel_enable;
- x86_saved_state32_t *regs;
+ thread_t thread;
+ void *vt;
+ unsigned int code, syscode;
+ struct sysent *callp;
+
+ int error;
+ vm_offset_t params;
+ struct proc *p;
+ struct uthread *uthread;
+ x86_saved_state32_t *regs;
+ boolean_t is_vfork;
+ pid_t pid;
assert(is_saved_state32(state));
regs = saved_state32(state);
-
- if (regs->eax == 0x800)
+#if DEBUG
+ if (regs->eax == 0x800) {
thread_exception_return();
-
+ }
+#endif
thread = current_thread();
uthread = get_bsdthread_info(thread);
+ uthread_reset_proc_refcount(uthread);
+
/* Get the approriate proc; may be different from task's for vfork() */
- if (!(uthread->uu_flag & UT_VFORK))
- p = (struct proc *)get_bsdtask_info(current_task());
- else
+ is_vfork = uthread->uu_flag & UT_VFORK;
+ if (__improbable(is_vfork != 0)) {
p = current_proc();
-
- /* Verify that we are not being called from a task without a proc */
- if (p == NULL) {
- regs->eax = EPERM;
- regs->efl |= EFL_CF;
- task_terminate_internal(current_task());
- thread_exception_return();
- /* NOTREACHED */
+ } else {
+ p = (struct proc *)get_bsdtask_info(current_task());
}
- //printf("[scall : eax %x]", regs->eax);
- code = regs->eax;
- params = (vm_offset_t) ((caddr_t)regs->uesp + sizeof (int));
- callp = (code >= nsysent) ? &sysent[63] : &sysent[code];
+ code = regs->eax & I386_SYSCALL_NUMBER_MASK;
+ syscode = (code < nsysent) ? code : SYS_invalid;
+ DEBUG_KPRINT_SYSCALL_UNIX("unix_syscall: code=%d(%s) eip=%u\n",
+ code, syscallnames[syscode], (uint32_t)regs->eip);
+ params = (vm_offset_t) (regs->uesp + sizeof(int));
+
+ regs->efl &= ~(EFL_CF);
+
+ callp = &sysent[syscode];
- if (callp == sysent) {
+ if (__improbable(callp == sysent)) {
code = fuword(params);
- params += sizeof (int);
- callp = (code >= nsysent) ? &sysent[63] : &sysent[code];
+ params += sizeof(int);
+ syscode = (code < nsysent) ? code : SYS_invalid;
+ callp = &sysent[syscode];
}
- vt = (void *)uthread->uu_arg;
- nargs = callp->sy_narg * sizeof (syscall_arg_t);
- if (nargs != 0) {
- sy_munge_t *mungerp;
+ vt = (void *)uthread->uu_arg;
- assert(nargs <= 8);
+ if (callp->sy_arg_bytes != 0) {
+#if CONFIG_REQUIRES_U32_MUNGING
+ sy_munge_t *mungerp;
+#else
+#error U32 syscalls on x86_64 kernel requires munging
+#endif
+ uint32_t nargs;
+ assert((unsigned) callp->sy_arg_bytes <= sizeof(uthread->uu_arg));
+ nargs = callp->sy_arg_bytes;
error = copyin((user_addr_t) params, (char *) vt, nargs);
if (error) {
regs->eax = error;
thread_exception_return();
/* NOTREACHED */
}
- if (code != 180) {
- int *ip = (int *)vt;
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START,
- *ip, *(ip+1), *(ip+2), *(ip+3), 0);
+ if (__probable(!code_is_kdebug_trace(code))) {
+ uint32_t *uip = vt;
+ KDBG_RELEASE(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START,
+ uip[0], uip[1], uip[2], uip[3]);
}
+
+#if CONFIG_REQUIRES_U32_MUNGING
mungerp = callp->sy_arg_munge32;
- /*
- * If non-NULL, then call the syscall argument munger to
- * copy in arguments (see xnu/bsd/dev/i386/munge.s); the
- * first argument is NULL because we are munging in place
- * after a copyin because the ABI currently doesn't use
- * registers to pass system call arguments.
- */
- if (mungerp != NULL)
- (*mungerp)(NULL, vt);
- } else
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START,
- 0, 0, 0, 0, 0);
+ if (mungerp != NULL) {
+ (*mungerp)(vt);
+ }
+#endif
+ } else {
+ KDBG_RELEASE(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START);
+ }
+
/*
* Delayed binding of thread credential to process credential, if we
* are not running with an explicitly set thread credential.
*/
- if (uthread->uu_ucred != p->p_ucred &&
- (uthread->uu_flag & UT_SETUID) == 0) {
- kauth_cred_t old = uthread->uu_ucred;
- uthread->uu_ucred = kauth_cred_proc_ref(p);
- if (IS_VALID_CRED(old))
- kauth_cred_unref(&old);
- }
+ kauth_cred_uthread_update(uthread, p);
uthread->uu_rval[0] = 0;
- uthread->uu_rval[1] = regs->edx;
-
- cancel_enable = callp->sy_cancel;
-
- if (cancel_enable == _SYSCALL_CANCEL_NONE) {
- uthread->uu_flag |= UT_NOTCANCELPT;
- } else {
- if ((uthread->uu_flag & (UT_CANCELDISABLE | UT_CANCEL | UT_CANCELED)) == UT_CANCEL) {
- if (cancel_enable == _SYSCALL_CANCEL_PRE) {
- /* system call cancelled; return to handle cancellation */
- regs->eax = (long long)EINTR;
- regs->efl |= EFL_CF;
- thread_exception_return();
- /* NOTREACHED */
- } else {
- thread_abort_safely(thread);
- }
+ uthread->uu_rval[1] = 0;
+ uthread->uu_flag |= UT_NOTCANCELPT;
+ uthread->syscall_code = code;
+ pid = proc_pid(p);
+
+#ifdef JOE_DEBUG
+ uthread->uu_iocount = 0;
+ uthread->uu_vpindex = 0;
+#endif
+
+#if CONFIG_MACF
+ if (__improbable(p->syscall_filter_mask != NULL && !bitstr_test(p->syscall_filter_mask, syscode))) {
+ error = mac_proc_check_syscall_unix(p, syscode);
+ if (error) {
+ goto skip_syscall;
}
}
-
- funnel_type = (callp->sy_funnel & FUNNEL_MASK);
- if (funnel_type == KERNEL_FUNNEL)
- thread_funnel_set(kernel_flock, TRUE);
-
- if (KTRPOINT(p, KTR_SYSCALL))
- ktrsyscall(p, code, callp->sy_narg, vt);
+#endif /* CONFIG_MACF */
AUDIT_SYSCALL_ENTER(code, p, uthread);
error = (*(callp->sy_call))((void *) p, (void *) vt, &(uthread->uu_rval[0]));
- AUDIT_SYSCALL_EXIT(error, p, uthread);
-
- if (error == ERESTART) {
+ AUDIT_SYSCALL_EXIT(code, p, uthread, error);
+
+#if CONFIG_MACF
+skip_syscall:
+#endif /* CONFIG_MACF */
+
+#ifdef JOE_DEBUG
+ if (uthread->uu_iocount) {
+ printf("system call returned with uu_iocount != 0\n");
+ }
+#endif
+#if CONFIG_DTRACE
+ uthread->t_dtrace_errno = error;
+#endif /* CONFIG_DTRACE */
+
+ if (__improbable(error == ERESTART)) {
/*
* Move the user's pc back to repeat the syscall:
* 5 bytes for a sysenter, or 2 for an int 8x.
* The SYSENTER_TF_CS covers single-stepping over a sysenter
* - see debug trap handler in idt.s/idt64.s
*/
- if (regs->cs == SYSENTER_CS || regs->cs == SYSENTER_TF_CS)
- regs->eip -= 5;
- else
- regs->eip -= 2;
- }
- else if (error != EJUSTRETURN) {
- if (error) {
- regs->eax = error;
- regs->efl |= EFL_CF; /* carry bit */
+
+ pal_syscall_restart(thread, state);
+ } else if (error != EJUSTRETURN) {
+ if (__improbable(error)) {
+ regs->eax = error;
+ regs->efl |= EFL_CF; /* carry bit */
} else { /* (not error) */
- regs->eax = uthread->uu_rval[0];
- regs->edx = uthread->uu_rval[1];
- regs->efl &= ~EFL_CF;
- }
+ /*
+ * We split retval across two registers, in case the
+ * syscall had a 64-bit return value, in which case
+ * eax/edx matches the function call ABI.
+ */
+ regs->eax = uthread->uu_rval[0];
+ regs->edx = uthread->uu_rval[1];
+ }
}
- if (KTRPOINT(p, KTR_SYSRET))
- ktrsysret(p, code, error, uthread->uu_rval[0]);
+ DEBUG_KPRINT_SYSCALL_UNIX(
+ "unix_syscall: error=%d retval=(%u,%u)\n",
+ error, regs->eax, regs->edx);
- if (cancel_enable == _SYSCALL_CANCEL_NONE)
- uthread->uu_flag &= ~UT_NOTCANCELPT;
+ uthread->uu_flag &= ~UT_NOTCANCELPT;
+ uthread->syscall_code = 0;
- /*
- * if we're holding the funnel
- * than drop it regardless of whether
- * we took it on system call entry
- */
- exit_funnel_section();
+#if DEBUG || DEVELOPMENT
+ kern_allocation_name_t
+ prior __assert_only = thread_set_allocation_name(NULL);
+ assertf(prior == NULL, "thread_set_allocation_name(\"%s\") not cleared", kern_allocation_get_name(prior));
+#endif /* DEBUG || DEVELOPMENT */
- if (uthread->uu_lowpri_delay) {
- /*
+ if (__improbable(uthread->uu_lowpri_window)) {
+ /*
* task is marked as a low priority I/O type
* and the I/O we issued while in this system call
* collided with normal I/O operations... we'll
* delay in order to mitigate the impact of this
* task on the normal operation of the system
*/
- IOSleep(uthread->uu_lowpri_delay);
- uthread->uu_lowpri_delay = 0;
+ throttle_lowpri_io(1);
+ }
+ if (__probable(!code_is_kdebug_trace(code))) {
+ KDBG_RELEASE(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END,
+ error, uthread->uu_rval[0], uthread->uu_rval[1], pid);
+ }
+
+ if (__improbable(!is_vfork && callp->sy_call == (sy_call_t *)execve && !error)) {
+ pal_execve_return(thread);
}
- if (code != 180)
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END,
- error, uthread->uu_rval[0], uthread->uu_rval[1], 0, 0);
+
+#if PROC_REF_DEBUG
+ if (__improbable(uthread_get_proc_refcount(uthread) != 0)) {
+ panic("system call returned with uu_proc_refcount != 0");
+ }
+#endif
thread_exception_return();
/* NOTREACHED */
}
-
+__attribute__((noreturn))
void
unix_syscall64(x86_saved_state_t *state)
{
- thread_t thread;
- unsigned short code;
- struct sysent *callp;
- void *uargp;
- int args_in_regs;
- int error;
- int funnel_type;
- struct proc *p;
- struct uthread *uthread;
- unsigned int cancel_enable;
+ thread_t thread;
+ void *vt;
+ unsigned int code, syscode;
+ struct sysent *callp;
+ int args_in_regs;
+ boolean_t args_start_at_rdi;
+ int error;
+ struct proc *p;
+ struct uthread *uthread;
x86_saved_state64_t *regs;
+ pid_t pid;
assert(is_saved_state64(state));
regs = saved_state64(state);
-
- if (regs->rax == 0x2000800)
+#if DEBUG
+ if (regs->rax == 0x2000800) {
thread_exception_return();
-
+ }
+#endif
thread = current_thread();
uthread = get_bsdthread_info(thread);
+ uthread_reset_proc_refcount(uthread);
+
/* Get the approriate proc; may be different from task's for vfork() */
- if (!(uthread->uu_flag & UT_VFORK))
+ if (__probable(!(uthread->uu_flag & UT_VFORK))) {
p = (struct proc *)get_bsdtask_info(current_task());
- else
+ } else {
p = current_proc();
+ }
/* Verify that we are not being called from a task without a proc */
- if (p == NULL) {
+ if (__improbable(p == NULL)) {
regs->rax = EPERM;
regs->isf.rflags |= EFL_CF;
task_terminate_internal(current_task());
thread_exception_return();
/* NOTREACHED */
}
- args_in_regs = 6;
- code = regs->rax & SYSCALL_NUMBER_MASK;
- callp = (code >= nsysent) ? &sysent[63] : &sysent[code];
- uargp = (void *)(®s->rdi);
+ code = regs->rax & SYSCALL_NUMBER_MASK;
+ syscode = (code < nsysent) ? code : SYS_invalid;
+ DEBUG_KPRINT_SYSCALL_UNIX(
+ "unix_syscall64: code=%d(%s) rip=%llx\n",
+ code, syscallnames[syscode], regs->isf.rip);
+ callp = &sysent[syscode];
+
+ vt = (void *)uthread->uu_arg;
- if (callp == sysent) {
- /*
+ if (__improbable(callp == sysent)) {
+ /*
* indirect system call... system call number
* passed as 'arg0'
*/
- code = regs->rdi;
- callp = (code >= nsysent) ? &sysent[63] : &sysent[code];
- uargp = (void *)(®s->rsi);
+ code = regs->rdi;
+ syscode = (code < nsysent) ? code : SYS_invalid;
+ callp = &sysent[syscode];
+ args_start_at_rdi = FALSE;
args_in_regs = 5;
+ } else {
+ args_start_at_rdi = TRUE;
+ args_in_regs = 6;
}
if (callp->sy_narg != 0) {
- if (code != 180) {
- uint64_t *ip = (uint64_t *)uargp;
+ assert(callp->sy_narg <= 8); /* size of uu_arg */
+
+ args_in_regs = MIN(args_in_regs, callp->sy_narg);
+ memcpy(vt, args_start_at_rdi ? ®s->rdi : ®s->rsi, args_in_regs * sizeof(syscall_arg_t));
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START,
- (int)(*ip), (int)(*(ip+1)), (int)(*(ip+2)), (int)(*(ip+3)), 0);
+ if (!code_is_kdebug_trace(code)) {
+ uint64_t *uip = vt;
+
+ KDBG_RELEASE(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START,
+ uip[0], uip[1], uip[2], uip[3]);
}
- assert(callp->sy_narg <= 8);
- if (callp->sy_narg > args_in_regs) {
- int copyin_count;
+ if (__improbable(callp->sy_narg > args_in_regs)) {
+ int copyin_count;
- copyin_count = (callp->sy_narg - args_in_regs) * sizeof(uint64_t);
+ copyin_count = (callp->sy_narg - args_in_regs) * sizeof(syscall_arg_t);
- error = copyin((user_addr_t)(regs->isf.rsp + sizeof(user_addr_t)), (char *)®s->v_arg6, copyin_count);
+ error = copyin((user_addr_t)(regs->isf.rsp + sizeof(user_addr_t)), (char *)&uthread->uu_arg[args_in_regs], copyin_count);
if (error) {
- regs->rax = error;
+ regs->rax = error;
regs->isf.rflags |= EFL_CF;
thread_exception_return();
/* NOTREACHED */
}
}
- /*
- * XXX Turn 64 bit unsafe calls into nosys()
- */
- if (callp->sy_funnel & UNSAFE_64BIT) {
- callp = &sysent[63];
- goto unsafe;
- }
-
- } else
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START,
- 0, 0, 0, 0, 0);
-unsafe:
+ } else {
+ KDBG_RELEASE(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START);
+ }
/*
* Delayed binding of thread credential to process credential, if we
* are not running with an explicitly set thread credential.
*/
- if (uthread->uu_ucred != p->p_ucred &&
- (uthread->uu_flag & UT_SETUID) == 0) {
- kauth_cred_t old = uthread->uu_ucred;
- uthread->uu_ucred = kauth_cred_proc_ref(p);
- if (IS_VALID_CRED(old))
- kauth_cred_unref(&old);
- }
+ kauth_cred_uthread_update(uthread, p);
uthread->uu_rval[0] = 0;
uthread->uu_rval[1] = 0;
-
- cancel_enable = callp->sy_cancel;
-
- if (cancel_enable == _SYSCALL_CANCEL_NONE) {
- uthread->uu_flag |= UT_NOTCANCELPT;
- } else {
- if ((uthread->uu_flag & (UT_CANCELDISABLE | UT_CANCEL | UT_CANCELED)) == UT_CANCEL) {
- if (cancel_enable == _SYSCALL_CANCEL_PRE) {
- /* system call cancelled; return to handle cancellation */
- regs->rax = EINTR;
- regs->isf.rflags |= EFL_CF;
- thread_exception_return();
- /* NOTREACHED */
- } else {
- thread_abort_safely(thread);
- }
+ uthread->uu_flag |= UT_NOTCANCELPT;
+ uthread->syscall_code = code;
+ pid = proc_pid(p);
+
+#ifdef JOE_DEBUG
+ uthread->uu_iocount = 0;
+ uthread->uu_vpindex = 0;
+#endif
+
+#if CONFIG_MACF
+ if (__improbable(p->syscall_filter_mask != NULL && !bitstr_test(p->syscall_filter_mask, syscode))) {
+ error = mac_proc_check_syscall_unix(p, syscode);
+ if (error) {
+ goto skip_syscall;
}
}
+#endif /* CONFIG_MACF */
- funnel_type = (callp->sy_funnel & FUNNEL_MASK);
- if (funnel_type == KERNEL_FUNNEL)
- thread_funnel_set(kernel_flock, TRUE);
+ AUDIT_SYSCALL_ENTER(code, p, uthread);
+ error = (*(callp->sy_call))((void *) p, vt, &(uthread->uu_rval[0]));
+ AUDIT_SYSCALL_EXIT(code, p, uthread, error);
- if (KTRPOINT(p, KTR_SYSCALL))
- ktrsyscall(p, code, callp->sy_narg, uargp);
+#if CONFIG_MACF
+skip_syscall:
+#endif /* CONFIG_MACF */
- AUDIT_SYSCALL_ENTER(code, p, uthread);
- error = (*(callp->sy_call))((void *) p, uargp, &(uthread->uu_rval[0]));
- AUDIT_SYSCALL_EXIT(error, p, uthread);
-
- if (error == ERESTART) {
+#ifdef JOE_DEBUG
+ if (uthread->uu_iocount) {
+ printf("system call returned with uu_iocount != 0\n");
+ }
+#endif
+
+#if CONFIG_DTRACE
+ uthread->t_dtrace_errno = error;
+#endif /* CONFIG_DTRACE */
+
+ if (__improbable(error == ERESTART)) {
/*
* all system calls come through via the syscall instruction
* in 64 bit mode... its 2 bytes in length
* move the user's pc back to repeat the syscall:
*/
- regs->isf.rip -= 2;
- }
- else if (error != EJUSTRETURN) {
- if (error) {
- regs->rax = error;
- regs->isf.rflags |= EFL_CF; /* carry bit */
+ pal_syscall_restart( thread, state );
+ } else if (error != EJUSTRETURN) {
+ if (__improbable(error)) {
+ regs->rax = error;
+ regs->isf.rflags |= EFL_CF; /* carry bit */
} else { /* (not error) */
-
switch (callp->sy_return_type) {
case _SYSCALL_RET_INT_T:
regs->rax = uthread->uu_rval[0];
case _SYSCALL_RET_ADDR_T:
case _SYSCALL_RET_SIZE_T:
case _SYSCALL_RET_SSIZE_T:
- regs->rax = *((uint64_t *)(&uthread->uu_rval[0]));
+ case _SYSCALL_RET_UINT64_T:
+ regs->rax = *((uint64_t *)(&uthread->uu_rval[0]));
regs->rdx = 0;
break;
case _SYSCALL_RET_NONE:
break;
}
regs->isf.rflags &= ~EFL_CF;
- }
+ }
}
- if (KTRPOINT(p, KTR_SYSRET))
- ktrsysret(p, code, error, uthread->uu_rval[0]);
+ DEBUG_KPRINT_SYSCALL_UNIX(
+ "unix_syscall64: error=%d retval=(%llu,%llu)\n",
+ error, regs->rax, regs->rdx);
- if (cancel_enable == _SYSCALL_CANCEL_NONE)
- uthread->uu_flag &= ~UT_NOTCANCELPT;
+ uthread->uu_flag &= ~UT_NOTCANCELPT;
+ uthread->syscall_code = 0;
- /*
- * if we're holding the funnel
- * than drop it regardless of whether
- * we took it on system call entry
- */
- exit_funnel_section();
+#if DEBUG || DEVELOPMENT
+ kern_allocation_name_t
+ prior __assert_only = thread_set_allocation_name(NULL);
+ assertf(prior == NULL, "thread_set_allocation_name(\"%s\") not cleared", kern_allocation_get_name(prior));
+#endif /* DEBUG || DEVELOPMENT */
- if (uthread->uu_lowpri_delay) {
- /*
+ if (__improbable(uthread->uu_lowpri_window)) {
+ /*
* task is marked as a low priority I/O type
* and the I/O we issued while in this system call
* collided with normal I/O operations... we'll
* delay in order to mitigate the impact of this
* task on the normal operation of the system
*/
- IOSleep(uthread->uu_lowpri_delay);
- uthread->uu_lowpri_delay = 0;
+ throttle_lowpri_io(1);
+ }
+ if (__probable(!code_is_kdebug_trace(code))) {
+ KDBG_RELEASE(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END,
+ error, uthread->uu_rval[0], uthread->uu_rval[1], pid);
+ }
+
+#if PROC_REF_DEBUG
+ if (__improbable(uthread_get_proc_refcount(uthread))) {
+ panic("system call returned with uu_proc_refcount != 0");
}
- if (code != 180)
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END,
- error, uthread->uu_rval[0], uthread->uu_rval[1], 0, 0);
+#endif
thread_exception_return();
/* NOTREACHED */
void
unix_syscall_return(int error)
{
- thread_t thread;
- struct uthread *uthread;
+ thread_t thread;
+ struct uthread *uthread;
struct proc *p;
- unsigned short code;
- vm_offset_t params;
+ unsigned int code;
struct sysent *callp;
- unsigned int cancel_enable;
thread = current_thread();
uthread = get_bsdthread_info(thread);
+ pal_register_cache_state(thread, DIRTY);
+
p = current_proc();
if (proc_is64bit(p)) {
- x86_saved_state64_t *regs;
+ x86_saved_state64_t *regs;
regs = saved_state64(find_user_regs(thread));
- /* reconstruct code for tracing before blasting rax */
- code = regs->rax & SYSCALL_NUMBER_MASK;
- callp = (code >= nsysent) ? &sysent[63] : &sysent[code];
+ code = uthread->syscall_code;
+ callp = (code >= nsysent) ? &sysent[SYS_invalid] : &sysent[code];
- if (callp == sysent)
- /*
- * indirect system call... system call number
- * passed as 'arg0'
- */
- code = regs->rdi;
+#if CONFIG_DTRACE
+ if (callp->sy_call == dtrace_systrace_syscall) {
+ dtrace_systrace_syscall_return( code, error, uthread->uu_rval );
+ }
+#endif /* CONFIG_DTRACE */
+ AUDIT_SYSCALL_EXIT(code, p, uthread, error);
if (error == ERESTART) {
- /*
- * all system calls come through via the syscall instruction
- * in 64 bit mode... its 2 bytes in length
- * move the user's pc back to repeat the syscall:
+ /*
+ * repeat the syscall
*/
- regs->isf.rip -= 2;
- }
- else if (error != EJUSTRETURN) {
- if (error) {
- regs->rax = error;
- regs->isf.rflags |= EFL_CF; /* carry bit */
+ pal_syscall_restart( thread, find_user_regs(thread));
+ } else if (error != EJUSTRETURN) {
+ if (error) {
+ regs->rax = error;
+ regs->isf.rflags |= EFL_CF; /* carry bit */
} else { /* (not error) */
-
- switch (callp->sy_return_type) {
+ switch (callp->sy_return_type) {
case _SYSCALL_RET_INT_T:
- regs->rax = uthread->uu_rval[0];
+ regs->rax = uthread->uu_rval[0];
regs->rdx = uthread->uu_rval[1];
break;
case _SYSCALL_RET_UINT_T:
- regs->rax = ((u_int)uthread->uu_rval[0]);
+ regs->rax = ((u_int)uthread->uu_rval[0]);
regs->rdx = ((u_int)uthread->uu_rval[1]);
break;
case _SYSCALL_RET_OFF_T:
case _SYSCALL_RET_ADDR_T:
case _SYSCALL_RET_SIZE_T:
case _SYSCALL_RET_SSIZE_T:
- regs->rax = *((uint64_t *)(&uthread->uu_rval[0]));
+ case _SYSCALL_RET_UINT64_T:
+ regs->rax = *((uint64_t *)(&uthread->uu_rval[0]));
regs->rdx = 0;
break;
case _SYSCALL_RET_NONE:
- break;
+ break;
default:
- panic("unix_syscall: unknown return type");
+ panic("unix_syscall: unknown return type");
break;
}
regs->isf.rflags &= ~EFL_CF;
- }
+ }
}
+ DEBUG_KPRINT_SYSCALL_UNIX(
+ "unix_syscall_return: error=%d retval=(%llu,%llu)\n",
+ error, regs->rax, regs->rdx);
} else {
- x86_saved_state32_t *regs;
+ x86_saved_state32_t *regs;
regs = saved_state32(find_user_regs(thread));
- /* reconstruct code for tracing before blasting eax */
- code = regs->eax;
- callp = (code >= nsysent) ? &sysent[63] : &sysent[code];
+ regs->efl &= ~(EFL_CF);
- if (callp == sysent) {
- params = (vm_offset_t) ((caddr_t)regs->uesp + sizeof (int));
- code = fuword(params);
+ code = uthread->syscall_code;
+ callp = (code >= nsysent) ? &sysent[SYS_invalid] : &sysent[code];
+
+#if CONFIG_DTRACE
+ if (callp->sy_call == dtrace_systrace_syscall) {
+ dtrace_systrace_syscall_return( code, error, uthread->uu_rval );
}
+#endif /* CONFIG_DTRACE */
+ AUDIT_SYSCALL_EXIT(code, p, uthread, error);
+
if (error == ERESTART) {
- regs->eip -= ((regs->cs & 0xffff) == SYSENTER_CS) ? 5 : 2;
- }
- else if (error != EJUSTRETURN) {
- if (error) {
- regs->eax = error;
- regs->efl |= EFL_CF; /* carry bit */
+ pal_syscall_restart( thread, find_user_regs(thread));
+ } else if (error != EJUSTRETURN) {
+ if (error) {
+ regs->eax = error;
+ regs->efl |= EFL_CF; /* carry bit */
} else { /* (not error) */
- regs->eax = uthread->uu_rval[0];
+ regs->eax = uthread->uu_rval[0];
regs->edx = uthread->uu_rval[1];
- regs->efl &= ~EFL_CF;
- }
+ }
}
+ DEBUG_KPRINT_SYSCALL_UNIX(
+ "unix_syscall_return: error=%d retval=(%u,%u)\n",
+ error, regs->eax, regs->edx);
}
- if (KTRPOINT(p, KTR_SYSRET))
- ktrsysret(p, code, error, uthread->uu_rval[0]);
- cancel_enable = callp->sy_cancel;
- if (cancel_enable == _SYSCALL_CANCEL_NONE)
- uthread->uu_flag &= ~UT_NOTCANCELPT;
+ uthread->uu_flag &= ~UT_NOTCANCELPT;
- /*
- * if we're holding the funnel
- * than drop it regardless of whether
- * we took it on system call entry
- */
- exit_funnel_section();
+#if DEBUG || DEVELOPMENT
+ kern_allocation_name_t
+ prior __assert_only = thread_set_allocation_name(NULL);
+ assertf(prior == NULL, "thread_set_allocation_name(\"%s\") not cleared", kern_allocation_get_name(prior));
+#endif /* DEBUG || DEVELOPMENT */
- if (uthread->uu_lowpri_delay) {
- /*
+ if (uthread->uu_lowpri_window) {
+ /*
* task is marked as a low priority I/O type
* and the I/O we issued while in this system call
* collided with normal I/O operations... we'll
* delay in order to mitigate the impact of this
* task on the normal operation of the system
*/
- IOSleep(uthread->uu_lowpri_delay);
- uthread->uu_lowpri_delay = 0;
+ throttle_lowpri_io(1);
+ }
+ if (!code_is_kdebug_trace(code)) {
+ KDBG_RELEASE(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END,
+ error, uthread->uu_rval[0], uthread->uu_rval[1], p->p_pid);
}
- if (code != 180)
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END,
- error, uthread->uu_rval[0], uthread->uu_rval[1], 0, 0);
thread_exception_return();
/* NOTREACHED */
}
-
-void
-munge_wwwlww(
- __unused const void *in32,
- void *out64)
-{
- uint32_t *arg32;
- uint64_t *arg64;
-
- /* we convert in place in out64 */
- arg32 = (uint32_t *) out64;
- arg64 = (uint64_t *) out64;
-
- arg64[5] = arg32[6]; /* wwwlwW */
- arg64[4] = arg32[5]; /* wwwlWw */
- arg32[7] = arg32[4]; /* wwwLww (hi) */
- arg32[6] = arg32[3]; /* wwwLww (lo) */
- arg64[2] = arg32[2]; /* wwWlww */
- arg64[1] = arg32[1]; /* wWwlww */
- arg64[0] = arg32[0]; /* Wwwlww */
-}
projects / apple / xnu.git / blobdiff