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| author | Patrick Oppenlander <patrick.oppenlander@gmail.com> | 2019-08-01 14:34:59 +1000 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2019-08-06 14:03:56 -0400 |
| commit | e0e8ae754cc7653fcff489a0e229adbbb49fde6c (patch) | |
| tree | 9c1fb95924eabf2c6e6b524dde515313ef611694 /src/thread | |
| parent | 49eacf29d29fa704b2feda879978ae64a825358c (diff) | |
| download | musl-e0e8ae754cc7653fcff489a0e229adbbb49fde6c.tar.gz musl-e0e8ae754cc7653fcff489a0e229adbbb49fde6c.tar.xz musl-e0e8ae754cc7653fcff489a0e229adbbb49fde6c.zip | |
in arm cancellation point asm, don't unnecessarily preserve link register
The only reason we needed to preserve the link register was because we were using a branch-link instruction to branch to __cp_cancel. Replacing this with a branch means we can avoid the save/restore as the link register is no longer modified.
Diffstat (limited to 'src/thread')
| -rw-r--r-- | src/thread/arm/syscall_cp.s | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/src/thread/arm/syscall_cp.s b/src/thread/arm/syscall_cp.s index a5730c08..e607dd42 100644 --- a/src/thread/arm/syscall_cp.s +++ b/src/thread/arm/syscall_cp.s @@ -11,19 +11,19 @@ .type __syscall_cp_asm,%function __syscall_cp_asm: mov ip,sp - stmfd sp!,{r4,r5,r6,r7,lr} + stmfd sp!,{r4,r5,r6,r7} __cp_begin: ldr r0,[r0] cmp r0,#0 - blne __cp_cancel + bne __cp_cancel mov r7,r1 mov r0,r2 mov r1,r3 ldmfd ip,{r2,r3,r4,r5,r6} svc 0 __cp_end: - ldmfd sp!,{r4,r5,r6,r7,lr} + ldmfd sp!,{r4,r5,r6,r7} bx lr __cp_cancel: - ldmfd sp!,{r4,r5,r6,r7,lr} + ldmfd sp!,{r4,r5,r6,r7} b __cancel |