AuroraMiddleware/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2024-11-25 14:30:06 +00:00
Code Issues Packages Projects Releases Wiki Activity

powerpc64[le]: Allocate extra stack frame on syscall.S

Browse Source 
The syscall function does not allocate the extra stack frame for scv like other
assembly syscalls using DO_CALL_SCV. So after commit d120fb9941 changed the
offset that is used to save LR, syscall ended up using an invalid offset,
causing regressions on powerpc64. So make sure the extra stack frame is
allocated in syscall.S as well to make it consistent with other uses of
DO_CALL_SCV and avoid similar issues in the future.

Tested on powerpc, powerpc64, and powerpc64le (with and without scv)

Reviewed-by: Raphael M Zinsly <rzinsly@linux.ibm.com>
This commit is contained in:
Matheus Castanho 2021-12-01 11:14:40 -03:00
parent c16dc431c8
commit ae91d3df24
1 changed files with 4 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
sysdeps/unix/sysv/linux/powerpc/syscall.S
View File

@ -27,7 +27,11 @@ ENTRY (syscall)
mr r8,r9
#if defined(USE_PPC_SCV) && !IS_IN(rtld) && (defined(__PPC64__) || defined(__powerpc64__))
CHECK_SCV_SUPPORT r9 0f
stdu r1,-SCV_FRAME_SIZE(r1)
cfi_adjust_cfa_offset(SCV_FRAME_SIZE)
DO_CALL_SCV
addi r1,r1,SCV_FRAME_SIZE
cfi_adjust_cfa_offset(-SCV_FRAME_SIZE)
RET_SCV
b 1f
#endif