[Crash-utility] [PATCH v1 4/5] arm64: Add gdb multi-stack unwind support

Co-developed-by: Alexey Makhalov <alexey.makhalov(a)broadcom.com&gt; Co-developed-by: Tao Liu <ltao(a)redhat.com&gt; Signed-off-by: Tao Liu <ltao(a)redhat.com&gt; --- arm64.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 52 insertions(+), 4 deletions(-) diff --git a/arm64.c b/arm64.c index 8291301..e72b5f4 100644 --- a/arm64.c +++ b/arm64.c @@ -226,6 +226,12 @@ arm64_get_current_task_reg(int regno, const char *name, tc = CURRENT_CONTEXT(); if (!tc) return FALSE; + + if (sid && sid <= extra_stacks_idx) { + ur_bitmap = extra_stacks_regs[extra_stacks_idx - 1]; + goto get_sub; + } + BZERO(&bt_setup, sizeof(struct bt_info)); clone_bt_info(&bt_setup, &bt_info, tc); fill_stackbuf(&bt_info); @@ -241,25 +247,29 @@ arm64_get_current_task_reg(int regno, const char *name, goto get_all; } +get_sub: switch (regno) { case X0_REGNUM ... X30_REGNUM: if (!NUM_IN_BITMAP(ur_bitmap->bitmap, REG_SEQ(arm64_pt_regs, regs[0]) + regno - X0_REGNUM)) { - FREEBUF(ur_bitmap); + if (!sid) + FREEBUF(ur_bitmap); return FALSE; } break; case SP_REGNUM: if (!NUM_IN_BITMAP(ur_bitmap->bitmap, REG_SEQ(arm64_pt_regs, sp))) { - FREEBUF(ur_bitmap); + if (!sid) + FREEBUF(ur_bitmap); return FALSE; } break; case PC_REGNUM: if (!NUM_IN_BITMAP(ur_bitmap->bitmap, REG_SEQ(arm64_pt_regs, pc))) { - FREEBUF(ur_bitmap); + if (!sid) + FREEBUF(ur_bitmap); return FALSE; } break; @@ -287,7 +297,7 @@ get_all: break; } - if (bt_info.need_free) { + if (!sid && bt_info.need_free) { FREEBUF(ur_bitmap); bt_info.need_free = FALSE; } @@ -3680,6 +3690,7 @@ arm64_back_trace_cmd(struct bt_info *bt) int level; ulong exception_frame; FILE *ofp; + extra_stacks_idx = 0; if (bt->flags & BT_OPT_BACK_TRACE) { if (machdep->flags & UNW_4_14) { @@ -3710,6 +3721,18 @@ arm64_back_trace_cmd(struct bt_info *bt) stackframe.pc = GET_STACK_ULONG(bt->bptr); stackframe.sp = bt->bptr + 8; bt->frameptr = stackframe.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.pc = stackframe.pc; + extra_stacks_regs[extra_stacks_idx]->ur.sp = stackframe.fp; + SET_BIT(extra_stacks_regs[extra_stacks_idx]->bitmap, + REG_SEQ(arm64_pt_regs, pc)); + SET_BIT(extra_stacks_regs[extra_stacks_idx]->bitmap, + REG_SEQ(arm64_pt_regs, sp)); + gdb_add_substack (extra_stacks_idx++); } else if (bt->hp && bt->hp->esp) { if (arm64_on_irq_stack(bt->tc->processor, bt->hp->esp)) { arm64_set_irq_stack(bt); @@ -3795,6 +3818,19 @@ arm64_back_trace_cmd(struct bt_info *bt) bt->flags &= ~BT_IRQSTACK; if (arm64_switch_stack(bt, &stackframe, ofp) == USER_MODE) break; + else if (tt->panic_task == bt->task) { + 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 *)); + } + memcpy(&extra_stacks_regs[extra_stacks_idx]->ur, + &bt->stackbuf[(ulong)(STACK_OFFSET_TYPE(exception_frame))], + sizeof(struct arm64_pt_regs)); + for (int i = 0; i < sizeof(struct arm64_pt_regs)/sizeof(long); i++) + SET_BIT(extra_stacks_regs[extra_stacks_idx]->bitmap, i); + gdb_add_substack (extra_stacks_idx++); + } } if ((bt->flags & BT_OVERFLOW_STACK) && @@ -3844,6 +3880,18 @@ arm64_back_trace_cmd_v2(struct bt_info *bt) stackframe.pc = GET_STACK_ULONG(bt->bptr + 8); stackframe.sp = bt->bptr + 16; bt->frameptr = stackframe.fp; + + 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.pc = stackframe.pc; + extra_stacks_regs[extra_stacks_idx]->ur.sp = stackframe.fp; + SET_BIT(extra_stacks_regs[extra_stacks_idx]->bitmap, + REG_SEQ(arm64_pt_regs, pc)); + SET_BIT(extra_stacks_regs[extra_stacks_idx]->bitmap, + REG_SEQ(arm64_pt_regs, sp)); + gdb_add_substack (extra_stacks_idx++); } else { if (arm64_on_irq_stack(bt->tc->processor, bt->frameptr)) { arm64_set_irq_stack(bt); -- 2.47.0