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am a1d1a46e: am 1c057607: Merge "Fix _exit_with_stack_teardown for x86."

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* commit 'a1d1a46ef635e559bbc4a4548ae28c84102d6f0b':
  Fix _exit_with_stack_teardown for x86.
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Elliott Hughes 2013-11-27 16:55:34 +00:00 committed by Android Git Automerger
commit 15a7a13ecf
1 changed files with 2 additions and 1 deletions
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libc/arch-x86/bionic/_exit_with_stack_teardown.S
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@ -3,12 +3,13 @@
// void _exit_with_stack_teardown(void* stackBase, size_t stackSize, int status) // void _exit_with_stack_teardown(void* stackBase, size_t stackSize, int status)
ENTRY(_exit_with_stack_teardown) ENTRY(_exit_with_stack_teardown)
// We can trash %ebx here since this call should never return. // We can trash registers because this function never returns.
// We can also take advantage of the fact that the linux syscall trap // We can also take advantage of the fact that the linux syscall trap
// handler saves all the registers, so we don't need a stack to keep // handler saves all the registers, so we don't need a stack to keep
// the status argument for exit while doing the munmap. // the status argument for exit while doing the munmap.
mov 4(%esp), %ebx // stackBase mov 4(%esp), %ebx // stackBase
mov 8(%esp), %ecx // stackSize mov 8(%esp), %ecx // stackSize
mov 12(%esp), %edx // Also copy 'status' off the stack we're about to unmap.
mov $__NR_munmap, %eax mov $__NR_munmap, %eax
int $0x80 int $0x80
// If munmap failed, we ignore the failure and exit anyway. // If munmap failed, we ignore the failure and exit anyway.