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commit 5daf13b1e637eec0f7a2de05b177cb0d76479aa2
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Author: Matheus Castanho <msc@linux.ibm.com>
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Date: Wed Dec 1 11:14:40 2021 -0300
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powerpc64[le]: Allocate extra stack frame on syscall.S
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The syscall function does not allocate the extra stack frame for scv like other
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assembly syscalls using DO_CALL_SCV. So after commit d120fb9941 changed the
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offset that is used to save LR, syscall ended up using an invalid offset,
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causing regressions on powerpc64. So make sure the extra stack frame is
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allocated in syscall.S as well to make it consistent with other uses of
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DO_CALL_SCV and avoid similar issues in the future.
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Tested on powerpc, powerpc64, and powerpc64le (with and without scv)
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Reviewed-by: Raphael M Zinsly <rzinsly@linux.ibm.com>
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(cherry picked from commit ae91d3df24a4a1b1f264d101a71a298bff310d14)
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diff --git a/sysdeps/unix/sysv/linux/powerpc/syscall.S b/sysdeps/unix/sysv/linux/powerpc/syscall.S
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index a29652feaf6764cf..a5497c8370982fe3 100644
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--- a/sysdeps/unix/sysv/linux/powerpc/syscall.S
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+++ b/sysdeps/unix/sysv/linux/powerpc/syscall.S
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@@ -27,7 +27,11 @@ ENTRY (syscall)
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mr r8,r9
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#if defined(USE_PPC_SCV) && !IS_IN(rtld) && (defined(__PPC64__) || defined(__powerpc64__))
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CHECK_SCV_SUPPORT r9 0f
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+ stdu r1,-SCV_FRAME_SIZE(r1)
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+ cfi_adjust_cfa_offset(SCV_FRAME_SIZE)
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DO_CALL_SCV
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+ addi r1,r1,SCV_FRAME_SIZE
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+ cfi_adjust_cfa_offset(-SCV_FRAME_SIZE)
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RET_SCV
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b 1f
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#endif
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