Author: jhibbits
Date: Mon Jan 23 04:03:12 2017
New Revision: 312659
URL: https://svnweb.freebsd.org/changeset/base/312659
Log:
Avoid using non-zero argument for __builtin_frame_address().
Building kernel with devel/powerpc64-gcc (6.2.0) yields the following error:
/usr/src/sys/powerpc/powerpc/db_trace.c:299:20: error: calling
'__builtin_frame_address' with a nonzero argument is unsafe
[-Werror=frame-address]
Work around this by dereferencing the frame address manually instead.
PR: 215600
Reported by: Mark Millard <markmi AT dsl-only DOT net>
MFC after: 2 weeks
Modified:
head/sys/powerpc/powerpc/db_trace.c
Modified: head/sys/powerpc/powerpc/db_trace.c
==============================================================================
--- head/sys/powerpc/powerpc/db_trace.c Mon Jan 23 02:21:06 2017
(r312658)
+++ head/sys/powerpc/powerpc/db_trace.c Mon Jan 23 04:03:12 2017
(r312659)
@@ -296,8 +296,12 @@ db_trace_self(void)
{
db_addr_t addr;
- addr = (db_addr_t)__builtin_frame_address(1);
- db_backtrace(curthread, addr, -1);
+ addr = (db_addr_t)__builtin_frame_address(0);
+ if (addr == 0) {
+ db_printf("Null frame address\n");
+ return;
+ }
+ db_backtrace(curthread, *(db_addr_t *)addr, -1);
}
int
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