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core/stack: gcc6 - fix __builtin_frame_address issue

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Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
This commit is contained in:
Vasant Hegde 2016-02-26 11:57:42 +05:30
parent 4f4f4996df
commit cc59e6fb0a
2 changed files with 54 additions and 1 deletions
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7
opal-prd.spec
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@ -1,6 +1,6 @@
Name: opal-prd
Version: 5.1.13
Release: 3%{?dist}
Release: 4%{?dist}
Summary: OPAL Processor Recovery Diagnostics Daemon
Group: System Environment/Daemons
@ -18,6 +18,7 @@ Source0: https://github.com/open-power/skiboot/archive/skiboot-%{version}.tar.gz
Source1: opal-prd.socket
Source2: opal-prd.service
Patch0: skiboot-1.1.13-opal-prd-makefile-fix.patch
Patch1: skiboot-1.1.13-gcc6-builtin-frame-addr-fix.patch
%description
This package provides a daemon to load and run the OpenPower firmware's
@ -50,6 +51,7 @@ services to the OS (Linux) on IBM Power and OpenPower systems.
%setup -q -n skiboot-skiboot-%{version}
%patch0 -p1 -b .opal-prd-makefile-fix
%patch1 -p1 -b .gcc6-builtin-frame-addr-fix
%build
OPAL_PRD_VERSION=%{version} make V=1 CFLAGS="%{optflags}" -C external/opal-prd
@ -103,6 +105,9 @@ install -m 644 -p skiboot.lid %{buildroot}%{_datadir}/qemu/skiboot.lid
%{_datadir}/qemu/
%changelog
* Fri Feb 26 2016 Vasant Hegde <hegdevasant@linux.vnet.ibm.com> - 5.1.13-4
- Fix stack frame compilation issue on gcc6
* Mon Feb 22 2016 Vasant Hegde <hegdevasant@linux.vnet.ibm.com> - 5.1.13-3
- Fix opal-prd recompilation issse during install

48
skiboot-1.1.13-gcc6-builtin-frame-addr-fix.patch Normal file
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@ -0,0 +1,48 @@
From d46ef7856c5b8f6f883350fc9523ca6c3399a1a5 Mon Sep 17 00:00:00 2001
From: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Date: Fri, 26 Feb 2016 11:26:54 +0530
Subject: [PATCH] core/stack: Fix __builtin_frame_address issue
GCC 6 warns if we pass nonzero values to __builtin_frame_address(). Hence
reorganize the code and pass zero to __builtin_frame_address().
core/stack.c: In function '__backtrace':
core/stack.c:34:17: error: calling '__builtin_frame_address' with a nonzero argument is unsafe [-Werror=frame-address]
unsigned long *fp = __builtin_frame_address(1);
Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
---
core/stack.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/core/stack.c b/core/stack.c
index 17f89d4..ead2b6d 100644
--- a/core/stack.c
+++ b/core/stack.c
@@ -31,10 +31,14 @@ extern uint32_t _stext, _etext;
void __nomcount __backtrace(struct bt_entry *entries, unsigned int *count)
{
unsigned int room = *count;
- unsigned long *fp = __builtin_frame_address(1);
+ unsigned long *fp = __builtin_frame_address(0);
+
+ if (!fp || (unsigned long)fp > top_of_ram)
+ return;
*count = 0;
while(room) {
+ fp = (unsigned long *)fp[0];
if (!fp || (unsigned long)fp > top_of_ram)
break;
entries->sp = (unsigned long)fp;
@@ -42,7 +46,6 @@ void __nomcount __backtrace(struct bt_entry *entries, unsigned int *count)
entries++;
*count = (*count) + 1;
room--;
- fp = (unsigned long *)fp[0];
}
}
--
2.5.0