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authorJoseph Myers <joseph@codesourcery.com>2019-07-30 14:05:11 +0000
committerJoseph Myers <joseph@codesourcery.com>2019-07-30 14:05:11 +0000
commitc86b8e7579ac2c4a1f1f70a56715580ed77b4a79 (patch)
tree50d4d3b94ce09e19a4ec5dea15113cb2a479d301
parent8a814e20d443adc460a1030fa1a66aa9ae817483 (diff)
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Restore r31 setting in powerpc32 swapcontext.
Commit ffe8a9a8318e1db225b22da8bc067408494bac5c, "powerpc: Remove rt_sigreturn usage on context function", removed from powerpc32 swapcontext a setting of r31 that is relied upon in subsequent code. I'm not sure why this didn't produce test failures in Adhemerval's 32-bit testing; in my (soft-float) testing in preparation for 2.30 release, I see several context-related failures FAIL: stdlib/tst-makecontext2 FAIL: stdlib/tst-makecontext3 FAIL: stdlib/tst-setcontext FAIL: stdlib/tst-setcontext2 FAIL: stdlib/tst-setcontext4 FAIL: stdlib/tst-setcontext7 FAIL: stdlib/tst-setcontext9 FAIL: stdlib/tst-swapcontext1 that did not appear in 2.29 testing. This patch restores the removed register setting in question, and thus fixes those failures. Tested for powerpc (soft-float). * sysdeps/unix/sysv/linux/powerpc/powerpc32/swapcontext-common.S (__CONTEXT_FUNC_NAME): Restore setting of r31.
-rw-r--r--ChangeLog5
-rw-r--r--sysdeps/unix/sysv/linux/powerpc/powerpc32/swapcontext-common.S3
2 files changed, 8 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog
index a5384542a8..6b46bfa09d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2019-07-30 Joseph Myers <joseph@codesourcery.com>
+
+ * sysdeps/unix/sysv/linux/powerpc/powerpc32/swapcontext-common.S
+ (__CONTEXT_FUNC_NAME): Restore setting of r31.
+
2019-07-30 Florian Weimer <fweimer@redhat.com>
* nptl/tst-pthread-getattr.c (allocate_and_test): Change return
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/swapcontext-common.S b/sysdeps/unix/sysv/linux/powerpc/powerpc32/swapcontext-common.S
index efebb10bba..6fa1ab7d6e 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/swapcontext-common.S
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/swapcontext-common.S
@@ -276,6 +276,9 @@ ENTRY(__CONTEXT_FUNC_NAME)
cmpwi r3,0
bne 3f /* L(error_exit) */
+ lwz r4,_FRAME_PARM_SAVE2(r1)
+ lwz r31,_UC_REGS_PTR(r4)
+
#ifdef __CONTEXT_ENABLE_FPRS
# ifdef __CONTEXT_ENABLE_VRS