31 lines
1.1 KiB
Diff
31 lines
1.1 KiB
Diff
From 2354eca9b776a6739112833f64754108cc0d1dc5 Mon Sep 17 00:00:00 2001
|
|
From: Shawn Anastasio <shawn@anastas.io>
|
|
Date: Fri, 3 May 2019 20:18:11 -0500
|
|
Subject: [PATCH] Fix ABI violation on ppc64 ELFv2, fixes #72
|
|
|
|
The existing ontop_fcontext implementation for ppc64 ELFv2
|
|
violates the ABI by not storing the callback entry address
|
|
in %r12 before branching. This results in crashes on this
|
|
platform.
|
|
|
|
This commit addresses this and allows the context library
|
|
to function as expected on ppc64 platforms using the ELFv2 ABI.
|
|
---
|
|
src/asm/ontop_ppc64_sysv_elf_gas.S | 3 +++
|
|
1 file changed, 3 insertions(+)
|
|
|
|
diff --git a/src/asm/ontop_ppc64_sysv_elf_gas.S b/src/asm/ontop_ppc64_sysv_elf_gas.S
|
|
index d54b16e7..cd97f456 100644
|
|
--- libs/context/src/asm/ontop_ppc64_sysv_elf_gas.S
|
|
+++ libs/context/src/asm/ontop_ppc64_sysv_elf_gas.S
|
|
@@ -174,6 +174,9 @@ ontop_fcontext:
|
|
# restore CTR
|
|
mtctr %r5
|
|
|
|
+ # store cb entrypoint in %r12, used for TOC calculation
|
|
+ mr %r12, %r5
|
|
+
|
|
# copy transfer_t into ontop_fn arg registers
|
|
mr %r3, %r7
|
|
# arg pointer already in %r4
|