+#elif defined(__arm__)
+
+#include <architecture/arm/asm_help.h>
+#include <mach/arm/syscall_sw.h>
+
+/*
+ * ARM system call interface:
+ *
+ * swi 0x80
+ * args: r0-r6
+ * return code: r0
+ * on error, carry bit is set in the psr, otherwise carry bit is cleared.
+ */
+
+/*
+ * Macros.
+ */
+
+/*
+ * until we update the architecture project, these live here
+ */
+
+#if defined(__DYNAMIC__)
+#define MI_GET_ADDRESS(reg,var) \
+ ldr reg, 4f ;\
+3: ldr reg, [pc, reg] ;\
+ b 5f ;\
+4: .long 6f - (3b + 8) ;\
+5: ;\
+ .non_lazy_symbol_pointer ;\
+6: ;\
+ .indirect_symbol var ;\
+ .long 0 ;\
+ .text ;\
+ .align 2
+#else
+#define MI_GET_ADDRESS(reg,var) \
+ ldr reg, 3f ;\
+ b 4f ;\
+3: .long var ;\
+4:
+#endif
+
+#if defined(__DYNAMIC__)
+#define MI_BRANCH_EXTERNAL(var) \
+ .globl var ;\
+ MI_GET_ADDRESS(ip, var) ;\
+ bx ip
+#else
+#define MI_BRANCH_EXTERNAL(var) ;\
+ .globl var ;\
+ b var
+#endif
+
+#if defined(__DYNAMIC__)
+#define MI_CALL_EXTERNAL(var) \
+ .globl var ;\
+ MI_GET_ADDRESS(ip,var) ;\
+ blx ip
+#else
+#define MI_CALL_EXTERNAL(var) \
+ .globl var ;\
+ bl var
+#endif
+
+#define MI_ENTRY_POINT(name) \
+ .text ;\
+ .align 2 ;\
+ .globl name ;\
+name:
+
+/* load the syscall number into r12 and trap */
+#define DO_SYSCALL(num) \
+ .if (((num) & 0xff) == (num)) ;\
+ mov r12, #(num) ;\
+ .elseif (((num) & 0x3fc) == (num)) ;\
+ mov r12, #(num) ;\
+ .else ;\
+ mov r12, #((num) & 0xffffff00) /* top half of the syscall number */ ;\
+ orr r12, r12, #((num) & 0xff) /* bottom half */ ;\
+ .endif ;\
+ swi #SWI_SYSCALL
+
+/* simple syscalls (0 to 4 args) */
+#define SYSCALL_0to4(name, cerror) \
+ MI_ENTRY_POINT(_##name) ;\
+ DO_SYSCALL(SYS_##name) ;\
+ bxcc lr /* return if carry is clear (no error) */ ; \
+1: MI_BRANCH_EXTERNAL(_##cerror)
+
+/* syscalls with 5 args is different, because of the single arg register load */
+#define SYSCALL_5(name, cerror) \
+ MI_ENTRY_POINT(_##name) ;\
+ mov ip, sp /* save a pointer to the args */ ; \
+ stmfd sp!, { r4-r5 } /* save r4-r5 */ ;\
+ ldr r4, [ip] /* load 5th arg */ ; \
+ DO_SYSCALL(SYS_##name) ;\
+ ldmfd sp!, { r4-r5 } /* restore r4-r5 */ ; \
+ bxcc lr /* return if carry is clear (no error) */ ; \
+1: MI_BRANCH_EXTERNAL(_##cerror)
+
+/* syscalls with 6 to 12 args. kernel may have to read from stack */
+#define SYSCALL_6to12(name, save_regs, arg_regs, cerror) \
+ MI_ENTRY_POINT(_##name) ;\
+ mov ip, sp /* save a pointer to the args */ ; \
+ stmfd sp!, { save_regs } /* callee saved regs */ ;\
+ ldmia ip, { arg_regs } /* load arg regs */ ; \
+ DO_SYSCALL(SYS_##name) ;\
+ ldmfd sp!, { save_regs } /* restore callee saved regs */ ; \
+ bxcc lr /* return if carry is clear (no error) */ ; \
+1: MI_BRANCH_EXTERNAL(_##cerror)
+
+#define COMMA ,
+
+#if __BIGGEST_ALIGNMENT__ > 4
+
+/* For the armv7k ABI, the alignment requirements may add padding. So we
+ * let the kernel figure it out and push extra on the stack to avoid un-needed
+ * copy-ins */
+
+ /* We'll also use r8 for moving arguments */
+
+#define SYSCALL_0(name) SYSCALL_0to4(name)
+#define SYSCALL_1(name) SYSCALL_0to4(name)
+#define SYSCALL_2(name) SYSCALL_0to4(name)
+#define SYSCALL_3(name) SYSCALL_0to4(name)
+#define SYSCALL_4(name) SYSCALL_6to12(name, r4-r5, r4-r5)
+#undef SYSCALL_5
+#define SYSCALL_5(name) SYSCALL_6to12(name, r4-r5, r4-r5)
+#define SYSCALL_6(name) SYSCALL_6to12(name, r4-r6 COMMA r8, r4-r6 COMMA r8)
+#define SYSCALL_7(name) SYSCALL_6to12(name, r4-r6 COMMA r8, r4-r6 COMMA r8)
+#define SYSCALL_8(name) SYSCALL_6to12(name, r4-r6 COMMA r8, r4-r6 COMMA r8)
+#define SYSCALL_12(name) SYSCALL_6to12(name, r4-r6 COMMA r8, r4-r6 COMMA r8)
+
+#else // !(__BIGGEST_ALIGNMENT__ > 4) (the normal arm32 ABI case)
+
+#define SYSCALL_0(name) SYSCALL_0to4(name)
+#define SYSCALL_1(name) SYSCALL_0to4(name)
+#define SYSCALL_2(name) SYSCALL_0to4(name)
+#define SYSCALL_3(name) SYSCALL_0to4(name)
+#define SYSCALL_4(name) SYSCALL_0to4(name)
+/* SYSCALL_5 declared above */
+#define SYSCALL_6(name) SYSCALL_6to12(name, r4-r5, r4-r5)
+#define SYSCALL_7(name) SYSCALL_6to12(name, r4-r6 COMMA r8, r4-r6)
+#define SYSCALL_8(name) SYSCALL_6to12(name, r4-r6 COMMA r8, r4-r6) /* 8th on stack */
+#define SYSCALL_12(name) SYSCALL_6to12(name, r4-r6 COMMA r8, r4-r6) /* 8th-12th on stack */
+
+#endif // __BIGGEST_ALIGNMENT__ > 4
+
+/* select the appropriate syscall code, based on the number of arguments */
+#ifndef __SYSCALL_32BIT_ARG_BYTES
+#define SYSCALL(name, nargs, cerror) SYSCALL_##nargs(name, cerror)
+#define SYSCALL_NONAME(name, nargs, cerror) SYSCALL_NONAME_##nargs(name, cerror)
+#else
+#if __SYSCALL_32BIT_ARG_BYTES < 20
+#define SYSCALL(name, nargs, cerror) SYSCALL_0to4(name, cerror)
+#define SYSCALL_NONAME(name, nargs, cerror) SYSCALL_NONAME_0to4(name, cerror)
+#elif __SYSCALL_32BIT_ARG_BYTES == 20
+#define SYSCALL(name, nargs, cerror) SYSCALL_5(name, cerror)
+#define SYSCALL_NONAME(name, nargs, cerror) SYSCALL_NONAME_5(name, cerror)
+#elif __SYSCALL_32BIT_ARG_BYTES == 24
+#define SYSCALL(name, nargs, cerror) SYSCALL_6(name, cerror)
+#define SYSCALL_NONAME(name, nargs, cerror) SYSCALL_NONAME_6(name, cerror)
+#elif __SYSCALL_32BIT_ARG_BYTES == 28
+#define SYSCALL(name, nargs, cerror) SYSCALL_7(name, cerror)
+#define SYSCALL_NONAME(name, nargs, cerror) SYSCALL_NONAME_7(name, cerror)
+#elif __SYSCALL_32BIT_ARG_BYTES == 32
+#define SYSCALL(name, nargs, cerror) SYSCALL_8(name, cerror)
+#define SYSCALL_NONAME(name, nargs, cerror) SYSCALL_NONAME_8(name, cerror)
+#elif __SYSCALL_32BIT_ARG_BYTES == 36
+#define SYSCALL(name, nargs, cerror) SYSCALL_8(name, cerror)
+#define SYSCALL_NONAME(name, nargs, cerror) SYSCALL_NONAME_8(name, cerror)
+#elif __SYSCALL_32BIT_ARG_BYTES == 44
+#define SYSCALL(name, nargs, cerror) SYSCALL_8(name, cerror)
+#define SYSCALL_NONAME(name, nargs, cerror) SYSCALL_NONAME_8(name, cerror)
+#elif __SYSCALL_32BIT_ARG_BYTES == 48
+#define SYSCALL(name, nargs, cerror) SYSCALL_12(name, cerror)
+#define SYSCALL_NONAME(name, nargs, cerror) SYSCALL_NONAME_12(name, cerror)
+#endif
+#endif
+
+#define SYSCALL_NONAME_0to4(name, cerror) \
+ DO_SYSCALL(SYS_##name) ;\
+ bcc 1f /* branch if carry bit is clear (no error) */ ; \
+ MI_BRANCH_EXTERNAL(_##cerror) /* call cerror */ ; \
+1:
+
+#define SYSCALL_NONAME_5(name, cerror) \
+ mov ip, sp /* save a pointer to the args */ ; \
+ stmfd sp!, { r4-r5 } /* save r4-r5 */ ;\
+ ldr r4, [ip] /* load 5th arg */ ; \
+ DO_SYSCALL(SYS_##name) ;\
+ ldmfd sp!, { r4-r5 } /* restore r4-r7 */ ; \
+ bcc 1f /* branch if carry bit is clear (no error) */ ; \
+ MI_BRANCH_EXTERNAL(_##cerror) /* call cerror */ ; \
+1:
+
+#define SYSCALL_NONAME_6to12(name, save_regs, arg_regs, cerror) \
+ mov ip, sp /* save a pointer to the args */ ; \
+ stmfd sp!, { save_regs } /* callee save regs */ ;\
+ ldmia ip, { arg_regs } /* load arguments */ ; \
+ DO_SYSCALL(SYS_##name) ;\
+ ldmfd sp!, { save_regs } /* restore callee saved regs */ ; \
+ bcc 1f /* branch if carry bit is clear (no error) */ ; \
+ MI_BRANCH_EXTERNAL(_##cerror) /* call cerror */ ; \
+1:
+
+
+#if __BIGGEST_ALIGNMENT__ > 4
+
+/* For the armv7k ABI, the alignment requirements may add padding. So we
+ * let the kernel figure it out and push extra on the stack to avoid un-needed
+ * copy-ins. We are relying on arguments that aren't in registers starting
+ * 32 bytes from sp. We also use r8 like in the mach case. */
+
+#define SYSCALL_NONAME_0(name, cerror) SYSCALL_NONAME_0to4(name, cerror)
+#define SYSCALL_NONAME_1(name, cerror) SYSCALL_NONAME_0to4(name, cerror)
+#define SYSCALL_NONAME_2(name, cerror) SYSCALL_NONAME_0to4(name, cerror)
+#define SYSCALL_NONAME_3(name, cerror) SYSCALL_NONAME_0to4(name, cerror)
+#define SYSCALL_NONAME_4(name, cerror) SYSCALL_NONAME_6to12(name, r4-r5, r4-r5, cerror)
+#undef SYSCALL_NONAME_5
+#define SYSCALL_NONAME_5(name, cerror) SYSCALL_NONAME_6to12(name, r4-r5, r4-r5, cerror)
+#define SYSCALL_NONAME_6(name, cerror) SYSCALL_NONAME_6to12(name, r4-r6 COMMA r8, r4-r6 COMMA r8, cerror)
+#define SYSCALL_NONAME_7(name, cerror) SYSCALL_NONAME_6to12(name, r4-r6 COMMA r8, r4-r6 COMMA r8, cerror)
+#define SYSCALL_NONAME_8(name, cerror) SYSCALL_NONAME_6to12(name, r4-r6 COMMA r8, r4-r6 COMMA r8, cerror)
+#define SYSCALL_NONAME_12(name, cerror) SYSCALL_NONAME_6to12(name, r4-r6 COMMA r8, r4-r6 COMMA r8, cerror)
+
+#else // !(__BIGGEST_ALIGNMENT__ > 4) (the normal arm32 ABI case)
+
+#define SYSCALL_NONAME_0(name, cerror) SYSCALL_NONAME_0to4(name, cerror)
+#define SYSCALL_NONAME_1(name, cerror) SYSCALL_NONAME_0to4(name, cerror)
+#define SYSCALL_NONAME_2(name, cerror) SYSCALL_NONAME_0to4(name, cerror)
+#define SYSCALL_NONAME_3(name, cerror) SYSCALL_NONAME_0to4(name, cerror)
+#define SYSCALL_NONAME_4(name, cerror) SYSCALL_NONAME_0to4(name, cerror)
+/* SYSCALL_NONAME_5 declared above */
+#define SYSCALL_NONAME_6(name, cerror) SYSCALL_NONAME_6to12(name, r4-r5, r4-r5, cerror)
+#define SYSCALL_NONAME_7(name, cerror) SYSCALL_NONAME_6to12(name, r4-r6 COMMA r8, r4-r6, cerror)
+#define SYSCALL_NONAME_8(name, cerror) SYSCALL_NONAME_6to12(name, r4-r6 COMMA r8, r4-r6, cerror)
+#define SYSCALL_NONAME_12(name, cerror) SYSCALL_NONAME_6to12(name, r4-r6 COMMA r8, r4-r6, cerror)
+
+#endif // __BIGGEST_ALIGNMENT__ > 4
+
+#define PSEUDO(pseudo, name, nargs, cerror) \
+ .globl pseudo ;\
+ .text ;\
+ .align 2 ;\
+pseudo: ;\
+ SYSCALL_NONAME(name, nargs, cerror)
+
+#define __SYSCALL2(pseudo, name, nargs, cerror) \
+ PSEUDO(pseudo, name, nargs, cerror) ;\
+ bx lr
+
+#define __SYSCALL(pseudo, name, nargs) \
+ PSEUDO(pseudo, name, nargs, cerror) ;\
+ bx lr
+
+#elif defined(__arm64__)
+
+#include <mach/arm/syscall_sw.h>
+#include <mach/arm/vm_param.h>
+#include <mach/arm64/asm.h>
+
+#if defined(__arm64__) && !defined(__LP64__)
+#define ZERO_EXTEND(argnum) uxtw x ## argnum, w ## argnum
+#else
+#define ZERO_EXTEND(argnum)
+#endif
+
+#if defined(__arm64__) && !defined(__LP64__)
+#define SIGN_EXTEND(argnum) sxtw x ## argnum, w ## argnum
+#else
+#define SIGN_EXTEND(argnum)
+#endif
+
+/*
+ * ARM64 system call interface:
+ *
+ * TBD
+ */
+
+#define DO_SYSCALL(num, cerror) \
+ mov x16, #(num) %%\
+ svc #SWI_SYSCALL %%\
+ b.cc 2f %%\
+ PUSH_FRAME %%\
+ bl _##cerror %%\
+ POP_FRAME %%\
+ ret %%\
+2:
+
+#define MI_GET_ADDRESS(reg,var) \
+ adrp reg, var@page %%\
+ add reg, reg, var@pageoff %%
+
+#define MI_CALL_EXTERNAL(sym) \
+ .globl sym %% \
+ bl sym
+
+#define SYSCALL_NONAME(name, nargs, cerror) \
+ DO_SYSCALL(SYS_##name, cerror) %% \
+1:
+
+#define MI_ENTRY_POINT(name) \
+ .text %% \
+ .align 2 %% \
+ .globl name %% \
+name:
+
+#define PSEUDO(pseudo, name, nargs, cerror) \
+ .text %% \
+ .align 2 %% \
+ .globl pseudo %% \
+ pseudo: %% \
+ SYSCALL_NONAME(name, nargs, cerror)
+
+#define __SYSCALL(pseudo, name, nargs) \
+ PSEUDO(pseudo, name, nargs, cerror) %% \
+ ret
+
+#define __SYSCALL2(pseudo, name, nargs, cerror) \
+ PSEUDO(pseudo, name, nargs, cerror) %% \
+ ret
+
projects / apple / xnu.git / blobdiff