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Message-Id: <20211206234358.2174444-1-stijn@linux-ipv6.be>
Date: Tue, 7 Dec 2021 01:43:58 +0200
From: Stijn Tintel <stijn@...ux-ipv6.be>
To: musl@...ts.openwall.com
Subject: [PATCH] ppc64: check for AltiVec in setjmp/longjmp
On machines without AltiVec, the lvx and stvx instructions are not
supported. Use __hwcap to test if AltiVec is supported.
Fixes SIGILL on PowerPC 64 processors without AltiVec support.
Runtime-tested on e5500 and e6500.
Signed-off-by: Stijn Tintel <stijn@...ux-ipv6.be>
---
src/setjmp/powerpc64/longjmp.s | 13 ++++++++++++-
src/setjmp/powerpc64/setjmp.s | 13 ++++++++++++-
2 files changed, 24 insertions(+), 2 deletions(-)
diff --git a/src/setjmp/powerpc64/longjmp.s b/src/setjmp/powerpc64/longjmp.s
index 81d45ff6..da7172af 100644
--- a/src/setjmp/powerpc64/longjmp.s
+++ b/src/setjmp/powerpc64/longjmp.s
@@ -56,7 +56,17 @@ longjmp:
lfd 30, 38*8(3)
lfd 31, 39*8(3)
- # 6) restore vector registers v20-v31
+ # 6) restore vector registers v20-v31 if hardware supports AltiVec
+ mflr 0
+ bl 1f
+ .hidden __hwcap
+ .long __hwcap-.
+1: mflr 4
+ lwz 5, 0(4)
+ add 4, 4, 5
+ ld 4, 0(4)
+ andis. 4, 4, 0x1000
+ beq 1f
addi 3, 3, 40*8
lvx 20, 0, 3 ; addi 3, 3, 16
lvx 21, 0, 3 ; addi 3, 3, 16
@@ -70,6 +80,7 @@ longjmp:
lvx 29, 0, 3 ; addi 3, 3, 16
lvx 30, 0, 3 ; addi 3, 3, 16
lvx 31, 0, 3
+1: mtlr 0
# 7) return r4 ? r4 : 1
mr 3, 4
diff --git a/src/setjmp/powerpc64/setjmp.s b/src/setjmp/powerpc64/setjmp.s
index 37683fda..32853693 100644
--- a/src/setjmp/powerpc64/setjmp.s
+++ b/src/setjmp/powerpc64/setjmp.s
@@ -69,7 +69,17 @@ __setjmp_toc:
stfd 30, 38*8(3)
stfd 31, 39*8(3)
- # 5) store vector registers v20-v31
+ # 5) store vector registers v20-v31 if hardware supports AltiVec
+ mflr 0
+ bl 1f
+ .hidden __hwcap
+ .long __hwcap-.
+1: mflr 4
+ lwz 5, 0(4)
+ add 4, 4, 5
+ ld 4, 0(4)
+ andis. 4, 4, 0x1000
+ beq 1f
addi 3, 3, 40*8
stvx 20, 0, 3 ; addi 3, 3, 16
stvx 21, 0, 3 ; addi 3, 3, 16
@@ -83,6 +93,7 @@ __setjmp_toc:
stvx 29, 0, 3 ; addi 3, 3, 16
stvx 30, 0, 3 ; addi 3, 3, 16
stvx 31, 0, 3
+1: mtlr 0
# 6) return 0
li 3, 0
--
2.32.0
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