[Crash-utility] [PATCH v1 5/5] ppc64: Add gdb multi-stack unwind support

[Tao Liu <ltao@xxxxxxxxxx>]

Co-developed-by: Alexey Makhalov <alexey.makhalov@xxxxxxxxxxxx>
Co-developed-by: Tao Liu <ltao@xxxxxxxxxx>
Signed-off-by: Tao Liu <ltao@xxxxxxxxxx>
---
 ppc64.c | 43 +++++++++++++++++++++++++++++++++++++------
 1 file changed, 37 insertions(+), 6 deletions(-)

diff --git a/ppc64.c b/ppc64.c
index 532eb3f..fec3b2a 100644
--- a/ppc64.c
+++ b/ppc64.c
@@ -2053,6 +2053,7 @@ ppc64_back_trace_cmd(struct bt_info *bt)
 	char buf[BUFSIZE];
 	struct gnu_request *req;
 	extern void print_stack_text_syms(struct bt_info *, ulong, ulong);
+	extra_stacks_idx = 0;
 
         bt->flags |= BT_EXCEPTION_FRAME;
 
@@ -2071,6 +2072,24 @@ ppc64_back_trace_cmd(struct bt_info *bt)
         req->pc = bt->instptr;
         req->sp = bt->stkptr;
 
+	if (tt->panic_task == bt->task) {
+		struct ppc64_pt_regs *pr = (struct ppc64_pt_regs *)bt->machdep;
+		if (pr->nip != req->pc || pr->gpr[1] != req->sp) {
+			if (!extra_stacks_regs[extra_stacks_idx]) {
+				extra_stacks_regs[extra_stacks_idx] =
+					(struct user_regs_bitmap_struct *)
+					GETBUF(sizeof(struct user_regs_bitmap_struct *));
+			}
+			extra_stacks_regs[extra_stacks_idx]->ur.nip = req->pc;
+			extra_stacks_regs[extra_stacks_idx]->ur.gpr[1] = req->sp;
+			SET_BIT(extra_stacks_regs[extra_stacks_idx]->bitmap,
+				REG_SEQ(ppc64_pt_regs, nip));
+			SET_BIT(extra_stacks_regs[extra_stacks_idx]->bitmap,
+				REG_SEQ(ppc64_pt_regs, gpr[0]) + 1);
+			gdb_add_substack (extra_stacks_idx++);
+		}
+	}
+
 	if (bt->flags &
 	(BT_TEXT_SYMBOLS|BT_TEXT_SYMBOLS_PRINT|BT_TEXT_SYMBOLS_NOPRINT)) {
 		if (!INSTACK(req->sp, bt))
@@ -2552,6 +2571,12 @@ ppc64_get_current_task_reg(int regno, const char *name, int size,
 	tc = CURRENT_CONTEXT();
 	if (!tc)
 		return FALSE;
+
+	if (sid && sid <= extra_stacks_idx) {
+		ur_bitmap = extra_stacks_regs[sid - 1];
+		goto get_sub;
+	}
+
 	BZERO(&bt_setup, sizeof(struct bt_info));
 	clone_bt_info(&bt_setup, &bt_info, tc);
 	fill_stackbuf(&bt_info);
@@ -2570,39 +2595,45 @@ ppc64_get_current_task_reg(int regno, const char *name, int size,
 		goto get_all;
 	}
 
+get_sub:
 	switch (regno) {
 	case PPC64_R0_REGNUM ... PPC64_R31_REGNUM:
 		if (!NUM_IN_BITMAP(ur_bitmap->bitmap,
 		    REG_SEQ(ppc64_pt_regs, gpr[0]) + regno - PPC64_R0_REGNUM)) {
-			FREEBUF(ur_bitmap);
+			if (!sid)
+				FREEBUF(ur_bitmap);
 			return FALSE;
 		}
 		break;
 	case PPC64_PC_REGNUM:
 		if (!NUM_IN_BITMAP(ur_bitmap->bitmap,
 		    REG_SEQ(ppc64_pt_regs, nip))) {
-			FREEBUF(ur_bitmap);
+			if (!sid)
+				FREEBUF(ur_bitmap);
 			return FALSE;
 		}
 		break;
 	case PPC64_MSR_REGNUM:
 		if (!NUM_IN_BITMAP(ur_bitmap->bitmap,
 		    REG_SEQ(ppc64_pt_regs, msr))) {
-			FREEBUF(ur_bitmap);
+			if (!sid)
+				FREEBUF(ur_bitmap);
 			return FALSE;
 		}
 		break;
 	case PPC64_LR_REGNUM:
 		if (!NUM_IN_BITMAP(ur_bitmap->bitmap,
 		    REG_SEQ(ppc64_pt_regs, link))) {
-			FREEBUF(ur_bitmap);
+			if (!sid)
+				FREEBUF(ur_bitmap);
 			return FALSE;
 		}
 		break;
 	case PPC64_CTR_REGNUM:
 		if (!NUM_IN_BITMAP(ur_bitmap->bitmap,
 		    REG_SEQ(ppc64_pt_regs, ctr))) {
-			FREEBUF(ur_bitmap);
+			if (!sid)
+				FREEBUF(ur_bitmap);
 			return FALSE;
 		}
 		break;
@@ -2645,7 +2676,7 @@ get_all:
 		ret = TRUE;
 		break;
 	}
-	if (bt_info.need_free) {
+	if (!sid && bt_info.need_free) {
 		FREEBUF(ur_bitmap);
 		bt_info.need_free = FALSE;
 	}
-- 
2.47.0
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