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Message-ID: <20241010130244.16423-1-stli@linux.ibm.com>
Date: Thu, 10 Oct 2024 15:02:44 +0200
From: Stefan Liebler <stli@...ux.ibm.com>
To: musl@...ts.openwall.com
Cc: Stefan Liebler <stli@...ux.ibm.com>
Subject: [PATCH] s390x: Don't allow br r0 in CRTJMP
When building musl with gcc 14, I've recognized that gcc has chosen
r0 for the branch-instruction. Therefore we don't jump, but keep
looping in ldso/dynlink.c:__dls3():
CRTJMP((void *)aux[AT_ENTRY], argv-1);
for(;;);
This patch adjusts the inline assembly constraints and marks "pc" as
address, which disallows usage of r0.
---
arch/s390x/reloc.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/s390x/reloc.h b/arch/s390x/reloc.h
index 6e5c1fb8..38de9d9b 100644
--- a/arch/s390x/reloc.h
+++ b/arch/s390x/reloc.h
@@ -10,4 +10,4 @@
#define REL_TPOFF R_390_TLS_TPOFF
#define CRTJMP(pc,sp) __asm__ __volatile__( \
- "lgr %%r15,%1; br %0" : : "r"(pc), "r"(sp) : "memory" )
+ "lgr %%r15,%1; br %0" : : "a"(pc), "r"(sp) : "memory" )
--
2.46.0
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