[Crash-utility] [PATCH v1 5/5] ppc64: 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; --- 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