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Merge "Remove the bogus exit status from _exit_with_stack_teardown."

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Elliott Hughes 2013-12-22 19:36:55 +00:00 committed by Gerrit Code Review
commit 470334333e
6 changed files with 43 additions and 58 deletions
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16
libc/arch-aarch64/bionic/_exit_with_stack_teardown.S
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@ -26,18 +26,16 @@
* SUCH DAMAGE.
*/
#include <asm/unistd.h>
#include <machine/asm.h>
#include <private/bionic_asm.h>
// void _exit_with_stack_teardown(void* stackBase, size_t stackSize, int status)
// void _exit_with_stack_teardown(void* stackBase, size_t stackSize)
ENTRY(_exit_with_stack_teardown)
mov w28, w2
mov w8, __NR_munmap
svc #0
mov w8, __NR_munmap
svc #0
// If munmap failed, we ignore the failure and exit anyway.
sxtw x0, w28
mov w8, __NR_exit
svc #0
mov x0, #0
mov w8, __NR_exit
svc #0
// The exit syscall does not return.
END(_exit_with_stack_teardown)

20
libc/arch-arm/bionic/_exit_with_stack_teardown.S
View file

@ -26,18 +26,16 @@
* SUCH DAMAGE.
*/
#include <machine/asm.h>
#include <asm/unistd.h>
#include <private/bionic_asm.h>
// void _exit_with_stack_teardown(void* stackBase, size_t stackSize, int status)
// void _exit_with_stack_teardown(void* stackBase, size_t stackSize)
ENTRY(_exit_with_stack_teardown)
mov lr, r2
ldr r7, =__NR_munmap
swi #0
// If munmap failed, we ignore the failure and exit anyway.
ldr r7, =__NR_munmap
swi #0
// If munmap failed, we ignore the failure and exit anyway.
mov r0, lr
ldr r7, =__NR_exit
swi #0
// The exit syscall does not return.
mov r0, #0
ldr r7, =__NR_exit
swi #0
// The exit syscall does not return.
END(_exit_with_stack_teardown)

10
libc/arch-mips/bionic/_exit_with_stack_teardown.S
View file

@ -30,21 +30,19 @@
.text
// void _exit_with_stack_teardown(void* stackBase, size_t stackSize, int status)
// void _exit_with_stack_teardown(void* stackBase, size_t stackSize)
.type _exit_with_stack_teardown, @function
.global _exit_with_stack_teardown
.align 4
.ent _exit_with_stack_teardown
_exit_with_stack_teardown:
move $s0,$a2 /* preserve status for exit() call */
li $v0,__NR_munmap
li $v0, __NR_munmap
syscall
// If munmap failed, we ignore the failure and exit anyway.
move $a0,$s0
li $v0,__NR_exit
move $a0, 0
li $v0, __NR_exit
syscall
// The exit syscall does not return.
.end _exit_with_stack_teardown

29
libc/arch-x86/bionic/_exit_with_stack_teardown.S
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@ -1,21 +1,16 @@
#include <asm/unistd.h>
#include <machine/asm.h>
#include <private/bionic_asm.h>
// void _exit_with_stack_teardown(void* stackBase, size_t stackSize, int status)
// void _exit_with_stack_teardown(void* stackBase, size_t stackSize)
ENTRY(_exit_with_stack_teardown)
// We can trash registers because this function never returns.
// 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
// the status argument for exit while doing the munmap.
mov 4(%esp), %ebx // stackBase
mov 8(%esp), %ecx // stackSize
mov 12(%esp), %edx // Also copy 'status' off the stack we're about to unmap.
mov $__NR_munmap, %eax
int $0x80
// If munmap failed, we ignore the failure and exit anyway.
// We can trash registers because this function never returns.
mov 4(%esp), %ebx // stackBase
mov 8(%esp), %ecx // stackSize
mov $__NR_munmap, %eax
int $0x80
// If munmap failed, we ignore the failure and exit anyway.
mov %edx, %ebx // status
movl $__NR_exit, %eax
int $0x80
// The exit syscall does not return.
mov $0, %ebx // status
movl $__NR_exit, %eax
int $0x80
// The exit syscall does not return.
END(_exit_with_stack_teardown)

22
libc/arch-x86_64/bionic/_exit_with_stack_teardown.S
View file

@ -26,20 +26,16 @@
* SUCH DAMAGE.
*/
#include <asm/unistd.h>
#include <machine/asm.h>
#include <private/bionic_asm.h>
// void _exit_with_stack_teardown(void* stackBase, size_t stackSize, int status)
// void _exit_with_stack_teardown(void* stackBase, size_t stackSize)
ENTRY(_exit_with_stack_teardown)
// We take advantage of the fact that the linux syscall trap
// handler saves all the registers, so we don't need to save
// the status argument for exit(2) while doing the munmap(2).
mov $__NR_munmap, %eax
syscall
// If munmap failed, we ignore the failure and exit anyway.
mov $__NR_munmap, %eax
syscall
// If munmap failed, we ignore the failure and exit anyway.
mov %rdx, %rdi // status
mov $__NR_exit, %eax
syscall
// The exit syscall does not return.
mov $0, %rdi
mov $__NR_exit, %eax
syscall
// The exit syscall does not return.
END(_exit_with_stack_teardown)

4
libc/bionic/pthread_exit.cpp
View file

@ -34,7 +34,7 @@
#include "pthread_internal.h"
extern "C" void _exit_with_stack_teardown(void*, size_t, int);
extern "C" void _exit_with_stack_teardown(void*, size_t);
extern "C" void __exit(int);
extern "C" int __set_tid_address(int*);
@ -125,7 +125,7 @@ void pthread_exit(void* return_value) {
sigfillset(&mask);
sigprocmask(SIG_SETMASK, &mask, NULL);
_exit_with_stack_teardown(stack_base, stack_size, 0);
_exit_with_stack_teardown(stack_base, stack_size);
}
// NOTREACHED, but we told the compiler this function is noreturn, and it doesn't believe us.