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ia32/vfork: simplify assembly #314

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Nov 30, 2023
Merged

ia32/vfork: simplify assembly #314

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20 changes: 5 additions & 15 deletions arch/ia32/syscalls.S
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Original file line number Diff line number Diff line change
Expand Up @@ -32,27 +32,17 @@ sym: \
.size sym, .-sym


.bss
vfork_address:
.space 4
.text
.globl vfork
.type vfork, @function
.align 4, 0x90
vfork:
mov (%esp), %eax
mov %eax, (vfork_address)
/* Save the return address as child will override parent's stack.
* Syscalls restore all registers but %eax thus %edx will not be overwritten.
* %edx is used as it need not to be restored before function exit. */
mov (%esp), %edx
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movl $4, %eax
int $0x80
cmp $0, %eax
jz vfork_child
push %eax
mov (vfork_address), %eax
mov %eax, 4(%esp)
pop %eax
ret
vfork_child:
mov $0, %eax
mov %edx, (%esp)
ret
.size vfork, .-vfork

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