svn commit: r287106 - head/lib/libproc
Andrew Turner
andrew at FreeBSD.org
Mon Aug 24 12:17:16 UTC 2015
Author: andrew
Date: Mon Aug 24 12:17:15 2015
New Revision: 287106
URL: https://svnweb.freebsd.org/changeset/base/287106
Log:
Fix libproc on architectures that don't need the program counter to be
adjusted. This seems to be the case on all non-x86 architectures libproc
supports.
Reviewed by: kib
Obtained from: ABT Systems Ltd
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D3465
Modified:
head/lib/libproc/proc_bkpt.c
Modified: head/lib/libproc/proc_bkpt.c
==============================================================================
--- head/lib/libproc/proc_bkpt.c Mon Aug 24 12:01:39 2015 (r287105)
+++ head/lib/libproc/proc_bkpt.c Mon Aug 24 12:17:15 2015 (r287106)
@@ -51,6 +51,7 @@ __FBSDID("$FreeBSD$");
#elif defined(__amd64__) || defined(__i386__)
#define BREAKPOINT_INSTR 0xcc /* int 0x3 */
#define BREAKPOINT_INSTR_SZ 1
+#define BREAKPOINT_ADJUST_SZ BREAKPOINT_INSTR_SZ
#elif defined(__arm__)
#define BREAKPOINT_INSTR 0xe7ffffff /* bkpt */
#define BREAKPOINT_INSTR_SZ 4
@@ -195,11 +196,19 @@ proc_bkptdel(struct proc_handle *phdl, u
/*
* Decrement pc so that we delete the breakpoint at the correct
* address, i.e. at the BREAKPOINT_INSTR address.
+ *
+ * This is only needed on some architectures where the pc value
+ * when reading registers points at the instruction after the
+ * breakpoint, e.g. x86.
*/
void
proc_bkptregadj(unsigned long *pc)
{
- *pc = *pc - BREAKPOINT_INSTR_SZ;
+
+ (void)pc;
+#ifdef BREAKPOINT_ADJUST_SZ
+ *pc = *pc - BREAKPOINT_ADJUST_SZ;
+#endif
}
/*
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