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authorRandolph Chung <tausq@debian.org>2007-06-12 02:27:32 -0400
committerKyle McMartin <kyle@minerva.i.cabal.ca>2007-06-21 17:46:22 -0400
commit05dc16d6a175139a5872d08db56ee277ec90df5b (patch)
treefd705746e7778c1f77ec812c82c7e33da75adb30 /arch/parisc
parente036306aa1832963cd147849b282259a32f5ac08 (diff)
[PARISC] unwinder improvements
Add special-case handling for "handle_interruption" so that we can rewind past the interruption. This is useful for seeing what caused a BUG() or WARN_ON(); otherwise the unwind stops at the interruption. Signed-off-by: Randolph Chung <tausq@debian.org> Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
Diffstat (limited to 'arch/parisc')
-rw-r--r--arch/parisc/kernel/unwind.c41
1 files changed, 34 insertions, 7 deletions
diff --git a/arch/parisc/kernel/unwind.c b/arch/parisc/kernel/unwind.c
index cad9d78312e0..322167737de7 100644
--- a/arch/parisc/kernel/unwind.c
+++ b/arch/parisc/kernel/unwind.c
@@ -16,6 +16,8 @@
16 16
17#include <asm/uaccess.h> 17#include <asm/uaccess.h>
18#include <asm/assembly.h> 18#include <asm/assembly.h>
19#include <asm/asm-offsets.h>
20#include <asm/ptrace.h>
19 21
20#include <asm/unwind.h> 22#include <asm/unwind.h>
21 23
@@ -199,6 +201,29 @@ static int unwind_init(void)
199 return 0; 201 return 0;
200} 202}
201 203
204#ifdef CONFIG_64BIT
205#define get_func_addr(fptr) fptr[2]
206#else
207#define get_func_addr(fptr) fptr[0]
208#endif
209
210static int unwind_special(struct unwind_frame_info *info, unsigned long pc, int frame_size)
211{
212 void handle_interruption(int, struct pt_regs *);
213 static unsigned long *hi = (unsigned long)&handle_interruption;
214
215 if (pc == get_func_addr(hi)) {
216 struct pt_regs *regs = (struct pt_regs *)(info->sp - frame_size - PT_SZ_ALGN);
217 dbg("Unwinding through handle_interruption()\n");
218 info->prev_sp = regs->gr[30];
219 info->prev_ip = regs->iaoq[0];
220
221 return 1;
222 }
223
224 return 0;
225}
226
202static void unwind_frame_regs(struct unwind_frame_info *info) 227static void unwind_frame_regs(struct unwind_frame_info *info)
203{ 228{
204 const struct unwind_table_entry *e; 229 const struct unwind_table_entry *e;
@@ -312,13 +337,15 @@ static void unwind_frame_regs(struct unwind_frame_info *info)
312 } 337 }
313 } 338 }
314 339
315 info->prev_sp = info->sp - frame_size; 340 if (!unwind_special(info, e->region_start, frame_size)) {
316 if (e->Millicode) 341 info->prev_sp = info->sp - frame_size;
317 info->rp = info->r31; 342 if (e->Millicode)
318 else if (rpoffset) 343 info->rp = info->r31;
319 info->rp = *(unsigned long *)(info->prev_sp - rpoffset); 344 else if (rpoffset)
320 info->prev_ip = info->rp; 345 info->rp = *(unsigned long *)(info->prev_sp - rpoffset);
321 info->rp = 0; 346 info->prev_ip = info->rp;
347 info->rp = 0;
348 }
322 349
323 dbg("analyzing func @ %lx, setting prev_sp=%lx " 350 dbg("analyzing func @ %lx, setting prev_sp=%lx "
324 "prev_ip=%lx npc=%lx\n", info->ip, info->prev_sp, 351 "prev_ip=%lx npc=%lx\n", info->ip, info->prev_sp,