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#include "psm.h"
/* NOTE: sysv64 calling convention is used on all x86_64 targets, including Windows! */
.text
#if CFG_TARGET_OS_darwin || CFG_TARGET_OS_macos || CFG_TARGET_OS_ios
#define GLOBL(fnname) .globl _##fnname
#define TYPE(fnname)
#define FUNCTION(fnname) _##fnname
#define SIZE(fnname,endlabel)
#else
#define GLOBL(fnname) .globl fnname
#define TYPE(fnname) .type fnname,@function
#define FUNCTION(fnname) fnname
#define SIZE(fnname,endlabel) .size fnname,endlabel-fnname
#endif
GLOBL(rust_psm_stack_direction)
.p2align 4
TYPE(rust_psm_stack_direction)
FUNCTION(rust_psm_stack_direction):
/* extern "sysv64" fn() -> u8 (%al) */
.cfi_startproc
movb $STACK_DIRECTION_DESCENDING, %al # always descending on x86_64
retq
.rust_psm_stack_direction_end:
SIZE(rust_psm_stack_direction,.rust_psm_stack_direction_end)
.cfi_endproc
GLOBL(rust_psm_stack_pointer)
.p2align 4
TYPE(rust_psm_stack_pointer)
FUNCTION(rust_psm_stack_pointer):
/* extern "sysv64" fn() -> *mut u8 (%rax) */
.cfi_startproc
leaq 8(%rsp), %rax
retq
.rust_psm_stack_pointer_end:
SIZE(rust_psm_stack_pointer,.rust_psm_stack_pointer_end)
.cfi_endproc
GLOBL(rust_psm_replace_stack)
.p2align 4
TYPE(rust_psm_replace_stack)
FUNCTION(rust_psm_replace_stack):
/* extern "sysv64" fn(%rdi: usize, %rsi: extern "sysv64" fn(usize), %rdx: *mut u8) */
.cfi_startproc
/*
All we gotta do is set the stack pointer to %rdx & tail-call the callback in %rsi.
8-byte offset necessary to account for the "return" pointer that would otherwise be placed onto
stack with a regular call
*/
leaq -8(%rdx), %rsp
jmpq *%rsi
.rust_psm_replace_stack_end:
SIZE(rust_psm_replace_stack,.rust_psm_replace_stack_end)
.cfi_endproc
GLOBL(rust_psm_on_stack)
.p2align 4
TYPE(rust_psm_on_stack)
FUNCTION(rust_psm_on_stack):
/* extern "sysv64" fn(%rdi: usize, %rsi: usize, %rdx: extern "sysv64" fn(usize, usize), %rcx: *mut u8) */
.cfi_startproc
pushq %rbp
.cfi_def_cfa %rsp, 16
.cfi_offset %rbp, -16
movq %rsp, %rbp
.cfi_def_cfa_register %rbp
movq %rcx, %rsp
callq *%rdx
movq %rbp, %rsp
popq %rbp
.cfi_def_cfa %rsp, 8
retq
.rust_psm_on_stack_end:
SIZE(rust_psm_on_stack,.rust_psm_on_stack_end)
.cfi_endproc
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