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-rw-r--r--libc/sysdeps/linux/arm/bits/syscalls.h16
1 files changed, 10 insertions, 6 deletions
diff --git a/libc/sysdeps/linux/arm/bits/syscalls.h b/libc/sysdeps/linux/arm/bits/syscalls.h
index af6cf843d..45180b636 100644
--- a/libc/sysdeps/linux/arm/bits/syscalls.h
+++ b/libc/sysdeps/linux/arm/bits/syscalls.h
@@ -137,17 +137,21 @@ return (type) (INLINE_SYSCALL(name, 7, arg1, arg2, arg3, arg4, arg5, arg6, arg7)
(int) __sys_result; })
#endif
#else /* !defined(__thumb__) */
-
+/* We can't use push/pop inside the asm because that breaks
+ unwinding (ie. thread cancellation).
+ */
#define INTERNAL_SYSCALL(name, err, nr, args...) \
({ unsigned int __sys_result; \
{ \
+ int _sys_buf[2]; \
register int _a1 __asm__ ("a1"); \
+ register int *_v3 __asm__ ("v3") = _sys_buf; \
+ *_v3 = (int) (SYS_ify(name)); \
LOAD_ARGS_##nr (args) \
- register int _v3 __asm__ ("v3") = (int) (SYS_ify(name)); \
- __asm__ __volatile__ ("push {r7}\n" \
- "\tmov r7, v3\n" \
- "\tswi 0 @ syscall " #name "\n" \
- "\tpop {r7}" \
+ __asm__ __volatile__ ("str r7, [v3, #4]\n" \
+ "\tldr r7, [v3]\n" \
+ "\tswi 0 @ syscall " #name "\n" \
+ "\tldr r7, [v3, #4]" \
: "=r" (_a1) \
: "r" (_v3) ASM_ARGS_##nr \
: "memory"); \