rust/src/rt/arch/x86_64/ccall.S

/*
	The function for switching to the C stack.  It is called
	__morestack because gdb allows any frame with that name to
	move the stack pointer to a different stack, which it usually
	considers an error.
*/

#include "regs.h"

#define ARG0 RUSTRT_ARG0_S
#define ARG1 RUSTRT_ARG1_S
#define ARG2 RUSTRT_ARG2_S
        
        .text

#if defined(__APPLE__) || defined(_WIN32)
.globl ___morestack
.private_extern MORESTACK
___morestack:
#else
.globl __morestack
.hidden __morestack
__morestack:
#endif

#if defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__)
	.cfi_startproc
#endif

	push %rbp
#if defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__)
	.cfi_def_cfa_offset 16
	.cfi_offset %rbp, -16
#endif

	mov %rsp,%rbp          // save rsp

#if defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__)
	.cfi_def_cfa_register %rbp
#endif

	mov ARG2,%rsp          // switch stack
	call *ARG1             // invoke target address
	mov %rbp,%rsp
	pop %rbp

	ret

#if defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__)
	.cfi_endproc
#endif
rt: Rename asm_call_on_stack to __morestack Newer gdb's will backtrace through functions named __morestack even if they change the stack. 2011-12-19 21:50:52 -06:00			`/*`
			`The function for switching to the C stack. It is called`
			`__morestack because gdb allows any frame with that name to`
			`move the stack pointer to a different stack, which it usually`
			`considers an error.`
			`*/`

hack around the problem that x86_64 expects first few args in regs. call on c-stack expects all data to be delivered on the stack. 2011-11-09 13:01:12 -06:00			`#include "regs.h"`

			`#define ARG0 RUSTRT_ARG0_S`
			`#define ARG1 RUSTRT_ARG1_S`
get pure wrappers approach running 2011-11-18 17:40:23 -06:00			`#define ARG2 RUSTRT_ARG2_S`
hack around the problem that x86_64 expects first few args in regs. call on c-stack expects all data to be delivered on the stack. 2011-11-09 13:01:12 -06:00
			`.text`
copy over x86-specific code 2011-10-12 17:45:17 -05:00
get pure wrappers approach running 2011-11-18 17:40:23 -06:00			`#if defined(__APPLE__) \|\| defined(_WIN32)`
rt: Rename asm_call_on_stack to __morestack Newer gdb's will backtrace through functions named __morestack even if they change the stack. 2011-12-19 21:50:52 -06:00			`.globl ___morestack`
			`.private_extern MORESTACK`
			`___morestack:`
get pure wrappers approach running 2011-11-18 17:40:23 -06:00			`#else`
rt: Rename asm_call_on_stack to __morestack Newer gdb's will backtrace through functions named __morestack even if they change the stack. 2011-12-19 21:50:52 -06:00			`.globl __morestack`
			`.hidden __morestack`
			`__morestack:`
get pure wrappers approach running 2011-11-18 17:40:23 -06:00			`#endif`
rt: Add DWARF CFI info to asm_call_on_stack This will allow the unwinder to unwind this function so we can call upcall_fail on the C stack. 2011-12-11 15:38:04 -06:00
freebsd support 2011-12-30 02:18:55 -06:00			`#if defined(__linux__) \|\| defined(__APPLE__) \|\| defined(__FreeBSD__)`
rt: Add DWARF CFI info to asm_call_on_stack This will allow the unwinder to unwind this function so we can call upcall_fail on the C stack. 2011-12-11 15:38:04 -06:00			`.cfi_startproc`
			`#endif`

			`push %rbp`
freebsd support 2011-12-30 02:18:55 -06:00			`#if defined(__linux__) \|\| defined(__APPLE__) \|\| defined(__FreeBSD__)`
rt: Add DWARF CFI info to asm_call_on_stack This will allow the unwinder to unwind this function so we can call upcall_fail on the C stack. 2011-12-11 15:38:04 -06:00			`.cfi_def_cfa_offset 16`
			`.cfi_offset %rbp, -16`
			`#endif`

			`mov %rsp,%rbp // save rsp`

freebsd support 2011-12-30 02:18:55 -06:00			`#if defined(__linux__) \|\| defined(__APPLE__) \|\| defined(__FreeBSD__)`
rt: Add DWARF CFI info to asm_call_on_stack This will allow the unwinder to unwind this function so we can call upcall_fail on the C stack. 2011-12-11 15:38:04 -06:00			`.cfi_def_cfa_register %rbp`
			`#endif`

			`mov ARG2,%rsp // switch stack`
			`call *ARG1 // invoke target address`
			`mov %rbp,%rsp`
			`pop %rbp`

			`ret`

freebsd support 2011-12-30 02:18:55 -06:00			`#if defined(__linux__) \|\| defined(__APPLE__) \|\| defined(__FreeBSD__)`
rt: Add DWARF CFI info to asm_call_on_stack This will allow the unwinder to unwind this function so we can call upcall_fail on the C stack. 2011-12-11 15:38:04 -06:00			`.cfi_endproc`
			`#endif`