* understand what is happening here
*/
-/*
- * J. David Anglin writes:
- *
- * "You have to adjust the current sp to that at the begining of the function.
- * There can be up to two stack additions to allocate the frame in the
- * prologue. Similar things happen in the epilogue. In the presence of
- * interrupts, you have to be concerned about where you are in the function
- * and what stack adjustments have taken place."
- *
- * For now these cases are not handled, but they should be!
- */
-
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/init.h>
#define dbg(x...)
#endif
-extern const struct unwind_table_entry __start___unwind[];
-extern const struct unwind_table_entry __stop___unwind[];
+extern struct unwind_table_entry __start___unwind[];
+extern struct unwind_table_entry __stop___unwind[];
static spinlock_t unwind_lock;
/*
const struct unwind_table_entry *e = 0;
unsigned long lo, hi, mid;
- addr -= table->base_addr;
-
for (lo = 0, hi = table->length; lo < hi; )
{
mid = (lo + hi) / 2;
static void
unwind_table_init(struct unwind_table *table, const char *name,
unsigned long base_addr, unsigned long gp,
- const void *table_start, const void *table_end)
+ void *table_start, void *table_end)
{
- const struct unwind_table_entry *start = table_start;
- const struct unwind_table_entry *end = table_end - 1;
+ struct unwind_table_entry *start = table_start;
+ struct unwind_table_entry *end =
+ (struct unwind_table_entry *)table_end - 1;
table->name = name;
table->base_addr = base_addr;
table->start = base_addr + start->region_start;
table->end = base_addr + end->region_end;
table->table = (struct unwind_table_entry *)table_start;
- table->length = end - start;
+ table->length = end - start + 1;
table->next = NULL;
+
+ for (; start <= end; start++) {
+ start->region_start += base_addr;
+ start->region_end += base_addr;
+ }
}
void *
unwind_table_add(const char *name, unsigned long base_addr,
unsigned long gp,
- const void *start, const void *end)
+ void *start, void *end)
{
struct unwind_table *table;
unsigned long flags;
sp = info->prev_sp;
} while (info->prev_ip < (unsigned long)_stext ||
info->prev_ip > (unsigned long)_etext);
+
+ dbg("analyzing func @ %lx with no unwind info, setting prev_sp=%lx prev_ip=%lx\n", info->ip, info->prev_sp, info->prev_ip);
} else {
dbg("e->start = 0x%x, e->end = 0x%x, Save_SP = %d, Save_RP = %d size = %u\n",
/* ldo X(sp), sp, or stwm X,D(sp) */
frame_size += (insn & 0x1 ? -1 << 13 : 0) |
((insn & 0x3fff) >> 1);
+ dbg("analyzing func @ %lx, insn=%08x @ %lx, frame_size = %ld\n", info->ip, insn, npc, frame_size);
} else if ((insn & 0xffe00008) == 0x7ec00008) {
/* std,ma X,D(sp) */
frame_size += (insn & 0x1 ? -1 << 13 : 0) |
(((insn >> 4) & 0x3ff) << 3);
+ dbg("analyzing func @ %lx, insn=%08x @ %lx, frame_size = %ld\n", info->ip, insn, npc, frame_size);
} else if (insn == 0x6bc23fd9) {
/* stw rp,-20(sp) */
rpoffset = 20;
looking_for_rp = 0;
+ dbg("analyzing func @ %lx, insn=stw rp,-20(sp) @ %lx\n", info->ip, npc);
} else if (insn == 0x0fc212c1) {
/* std rp,-16(sr0,sp) */
rpoffset = 16;
looking_for_rp = 0;
+ dbg("analyzing func @ %lx, insn=std rp,-16(sp) @ %lx\n", info->ip, npc);
}
}
info->prev_sp = info->sp - frame_size;
if (rpoffset)
- info->prev_ip = *(unsigned long *)(info->prev_sp - rpoffset);
+ info->rp = *(unsigned long *)(info->prev_sp - rpoffset);
+ info->prev_ip = info->rp;
+ info->rp = 0;
+
+ dbg("analyzing func @ %lx, setting prev_sp=%lx prev_ip=%lx\n", info->ip, info->prev_sp, info->prev_ip);
}
}
void unwind_frame_init(struct unwind_frame_info *info, struct task_struct *t,
- struct pt_regs *regs)
+ unsigned long sp, unsigned long ip, unsigned long rp)
{
memset(info, 0, sizeof(struct unwind_frame_info));
info->t = t;
- info->sp = regs->ksp;
- info->ip = regs->kpc;
+ info->sp = sp;
+ info->ip = ip;
+ info->rp = rp;
- dbg("(%d) Start unwind from sp=%08lx ip=%08lx\n", (int)t->pid, info->sp, info->ip);
+ dbg("(%d) Start unwind from sp=%08lx ip=%08lx\n", t ? (int)t->pid : 0, info->sp, info->ip);
}
void unwind_frame_init_from_blocked_task(struct unwind_frame_info *info, struct task_struct *t)
{
struct pt_regs *regs = &t->thread.regs;
- unwind_frame_init(info, t, regs);
+ unwind_frame_init(info, t, regs->ksp, regs->kpc, 0);
+}
+
+void unwind_frame_init_running(struct unwind_frame_info *info, struct pt_regs *regs)
+{
+ unwind_frame_init(info, current, regs->gr[30], regs->iaoq[0],
+ regs->gr[2]);
}
int unwind_once(struct unwind_frame_info *next_frame)
git://git.onelab.eu / linux-2.6.git / blobdiff