[Crash-utility] [PATCH v3] arm64: more improvement of bt -f
Dave Anderson
anderson at redhat.com
Tue Jun 21 20:52:32 UTC 2016
----- Original Message -----
> Dave,
>
> This patch addresses all the issues that I mentioned in [1], and
> re-factored arm64_back_trace_cmd() to make it simpler, while
> arm64_unwind_frame() gets a bit complicated. But those changes,
> I believe, make the code more readable and easily maintainable.
> (The only ugly part is arm64_in_exp_entry(). I have no better ideas.)
>
> Please pick up this patch if you like.
> It is to be applied on top of your current master.
>
> [1] https://www.redhat.com/archives/crash-utility/2016-June/msg00040.html
>
> Thanks,
> -Takahiro AKASHI
Takahiro,
I hope to be able to take a look at this tomorrow, but upon an initial compile,
there's an error at line 1782 that prevents a chunk of code from ever being
executed:
# make warn
... [ cut ] ...
cc -c -g -DARM64 -DLZO -DSNAPPY -DGDB_7_6 arm64.c -Wall -O2 -Wstrict-prototypes -Wmissing-prototypes -fstack-protector -Wformat-security
arm64.c: In function 'arm64_unwind_frame':
arm64.c:1782:14: warning: suggest parentheses around operand of '!' or change '&' to '&& or '!' to '~' [-Wparentheses]
} else if (!machdep->flags & IRQ_STACKS) {
^
arm64.c:1729:31: warning: unused variable 'orig_sp' [-Wunused-variable]
unsigned long irq_stack_ptr, orig_sp;
^
arm64.c: At top level:
arm64.c:1489:1: warning: 'arm64_in_exception_text' defined but not used [-Wunused-function]
arm64_in_exception_text(ulong ptr)
^
...
Here it is:
1773 if (ext_frame.fp == 0) {
1774 /*
1775 * Either on process stack or on IRQ stack,
1776 * the next frame is the last one on process stack.
1777 */
1778
1779 frame->sp = bt->stacktop
1780 - sizeof(struct arm64_pt_regs) - 0x10;
1781 frame->fp = frame->sp;
1782 } else if (!machdep->flags & IRQ_STACKS) {
1783 /*
1784 * We are on process stack. Just fake a dummy frame
1785 */
1786
1787 frame->sp = ext_frame.fp
1788 - sizeof(struct arm64_pt_regs);
1789 frame->fp = frame->sp;
1790 } else {
1791 /* We are on IRQ stack */
1792
1793 ms = machdep->machspec;
1794 irq_stack_ptr = ms->irq_stacks[bt->tc->processor]
1795 + ms->irq_stack_size - 0x20;
1796
I know what it should look like, but I can't understand how the code works as-is?
Dave
>
> ======8<======
> >From c1e06fdd21bb70d247babd43cf2762e0cdf6979c Mon Sep 17 00:00:00 2001
> From: AKASHI Takahiro <takahiro.akashi at linaro.org>
> Date: Thu, 16 Jun 2016 09:29:52 +0900
> Subject: [PATCH v3] arm64: more improvement of bt -f
>
> Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
> ---
> arm64.c | 486
> +++++++++++++++++++++++++++++++++++++++++++---------------------
> defs.h | 6 +
> 2 files changed, 337 insertions(+), 155 deletions(-)
>
> diff --git a/arm64.c b/arm64.c
> index 06676d1..9d42fe6 100644
> --- a/arm64.c
> +++ b/arm64.c
> @@ -43,17 +43,18 @@ static void arm64_stackframe_init(void);
> static int arm64_eframe_search(struct bt_info *);
> static int arm64_is_kernel_exception_frame(struct bt_info *, ulong);
> static int arm64_in_exception_text(ulong);
> +static int arm64_in_exp_entry(ulong);
> static void arm64_back_trace_cmd(struct bt_info *);
> static void arm64_print_text_symbols(struct bt_info *, struct
> arm64_stackframe *, FILE *);
> static int arm64_print_stackframe_entry(struct bt_info *, int, struct
> arm64_stackframe *, FILE *);
> -static void arm64_display_full_frame(struct bt_info *, ulong);
> -static int arm64_unwind_frame(struct bt_info *, struct arm64_stackframe *);
> +static void arm64_display_full_frame(struct bt_info *, struct
> arm64_stackframe *, struct arm64_stackframe *);
> +static int arm64_unwind_frame(struct bt_info *, struct arm64_stackframe *,
> FILE *);
> static int arm64_get_dumpfile_stackframe(struct bt_info *, struct
> arm64_stackframe *);
> static int arm64_in_kdump_text(struct bt_info *, struct arm64_stackframe *);
> static int arm64_in_kdump_text_on_irq_stack(struct bt_info *);
> -static int arm64_switch_stack(struct bt_info *, struct arm64_stackframe *,
> FILE *);
> static int arm64_get_stackframe(struct bt_info *, struct arm64_stackframe
> *);
> static void arm64_get_stack_frame(struct bt_info *, ulong *, ulong *);
> +static void arm64_gen_hidden_frame(struct bt_info *bt, ulong, struct
> arm64_stackframe *);
> static void arm64_print_exception_frame(struct bt_info *, ulong, int, FILE
> *);
> static void arm64_do_bt_reference_check(struct bt_info *, ulong, char *);
> static int arm64_translate_pte(ulong, void *, ulonglong);
> @@ -580,6 +581,10 @@ arm64_dump_machdep_table(ulong arg)
> fprintf(fp, " __exception_text_end: %lx\n", ms->__exception_text_end);
> fprintf(fp, " __irqentry_text_start: %lx\n", ms->__irqentry_text_start);
> fprintf(fp, " __irqentry_text_end: %lx\n", ms->__irqentry_text_end);
> + fprintf(fp, " exp_entry1_start: %lx\n", ms->exp_entry1_start);
> + fprintf(fp, " exp_entry1_end: %lx\n", ms->exp_entry1_end);
> + fprintf(fp, " exp_entry2_start: %lx\n", ms->exp_entry2_start);
> + fprintf(fp, " exp_entry2_end: %lx\n", ms->exp_entry2_end);
> fprintf(fp, " panic_task_regs: %lx\n", (ulong)ms->panic_task_regs);
> fprintf(fp, " PTE_PROT_NONE: %lx\n", ms->PTE_PROT_NONE);
> fprintf(fp, " PTE_FILE: ");
> @@ -1286,6 +1291,15 @@ arm64_stackframe_init(void)
> machdep->machspec->__irqentry_text_start = sp1->value;
> machdep->machspec->__irqentry_text_end = sp2->value;
> }
> + if ((sp1 = kernel_symbol_search("vectors")) &&
> + (sp1n = kernel_symbol_search("cpu_switch_to")) &&
> + (sp2 = kernel_symbol_search("ret_fast_syscall")) &&
> + (sp2n = kernel_symbol_search("sys_rt_sigreturn_wrapper"))) {
> + machdep->machspec->exp_entry1_start = sp1->value;
> + machdep->machspec->exp_entry1_end = sp1n->value;
> + machdep->machspec->exp_entry2_start = sp2->value;
> + machdep->machspec->exp_entry2_end = sp2n->value;
> + }
>
> if ((sp1 = kernel_symbol_search("crash_kexec")) &&
> (sp1n = next_symbol(NULL, sp1)) &&
> @@ -1488,9 +1502,21 @@ arm64_in_exception_text(ulong ptr)
> return FALSE;
> }
>
> +static int
> +arm64_in_exp_entry(ulong addr)
> +{
> + struct machine_specific *ms;
> +
> + ms = machdep->machspec;
> + if ((ms->exp_entry1_start <= addr) && (addr < ms->exp_entry1_end))
> + return TRUE;
> + if ((ms->exp_entry2_start <= addr) && (addr < ms->exp_entry2_end))
> + return TRUE;
> + return FALSE;
> +}
> +
> #define BACKTRACE_CONTINUE (1)
> #define BACKTRACE_COMPLETE_KERNEL (2)
> -#define BACKTRACE_COMPLETE_USER (3)
>
> static int
> arm64_print_stackframe_entry(struct bt_info *bt, int level, struct
> arm64_stackframe *frame, FILE *ofp)
> @@ -1511,11 +1537,6 @@ arm64_print_stackframe_entry(struct bt_info *bt, int
> level, struct arm64_stackfr
> value_to_symstr(frame->pc, buf, bt->radix);
> }
>
> - if ((bt->flags & BT_FULL) && level) {
> - arm64_display_full_frame(bt, frame->fp);
> - bt->frameptr = frame->fp;
> - }
> -
> fprintf(ofp, "%s#%d [%8lx] %s at %lx", level < 10 ? " " : "", level,
> frame->fp ? frame->fp : bt->stacktop - USER_EFRAME_OFFSET,
> name_plus_offset ? name_plus_offset : name, frame->pc);
> @@ -1534,7 +1555,8 @@ arm64_print_stackframe_entry(struct bt_info *bt, int
> level, struct arm64_stackfr
> fprintf(ofp, " %s\n", buf);
> }
>
> - if (STREQ(name, "start_kernel") || STREQ(name, "secondary_start_kernel") ||
> + if (STREQ(name, "start_kernel") ||
> + STREQ(name, "secondary_start_kernel") ||
> STREQ(name, "kthread") || STREQ(name, "kthreadd"))
> return BACKTRACE_COMPLETE_KERNEL;
>
> @@ -1542,46 +1564,169 @@ arm64_print_stackframe_entry(struct bt_info *bt, int
> level, struct arm64_stackfr
> }
>
> static void
> -arm64_display_full_frame(struct bt_info *bt, ulong sp)
> +arm64_display_full_frame(struct bt_info *bt, struct arm64_stackframe *cur,
> + struct arm64_stackframe *next)
> {
> + struct machine_specific *ms;
> + ulong next_fp, stackbase;
> + char *stackbuf;
> int i, u_idx;
> ulong *up;
> ulong words, addr;
> char buf[BUFSIZE];
>
> - if (bt->frameptr == sp)
> - return;
> + stackbase = bt->stackbase;
> + stackbuf = bt->stackbuf;
> + ms = machdep->machspec;
>
> - if (!INSTACK(sp, bt) || !INSTACK(bt->frameptr, bt)) {
> - if (sp == 0)
> - sp = bt->stacktop - USER_EFRAME_OFFSET;
> - else
> - return;
> - }
> + /* Calc next fp for dump */
> + if (next->fp == 0)
> + /* last stackframe on kernel tack */
> + next_fp = bt->stacktop - 0x10;
> + else if (!INSTACK(cur->sp, bt)) {
> + /* We have just switched over stacks */
> + next_fp = ms->irq_stacks[bt->tc->processor]
> + + ms->irq_stack_size - 0x10;
> +
> + /*
> + * We are already buffering a process stack.
> + * So use an old buffer for IRQ stack.
> + */
> + stackbase = ms->irq_stacks[bt->tc->processor];
> + stackbuf = ms->irq_stackbuf;
> + } else
> + next_fp = next->fp;
> +
> + if (CRASHDEBUG(1))
> + fprintf(fp, " frame <%016lx:%016lx>\n", cur->fp, next_fp);
>
> - words = (sp - bt->frameptr) / sizeof(ulong);
> + /* Check here because we want to see a debug message above. */
> + if (!(bt->flags & BT_FULL))
> + return;
>
> - addr = bt->frameptr;
> - u_idx = (bt->frameptr - bt->stackbase)/sizeof(ulong);
> + /* Dump */
> + words = (next_fp - cur->fp) / sizeof(ulong);
> + addr = cur->fp;
> + u_idx = (cur->fp - stackbase)/sizeof(ulong);
> for (i = 0; i < words; i++, u_idx++) {
> if (!(i & 1))
> fprintf(fp, "%s %lx: ", i ? "\n" : "", addr);
>
> - up = (ulong *)(&bt->stackbuf[u_idx*sizeof(ulong)]);
> + up = (ulong *)(&stackbuf[u_idx*sizeof(ulong)]);
> fprintf(fp, "%s ", format_stack_entry(bt, buf, *up, 0));
>
> addr += sizeof(ulong);
> }
> fprintf(fp, "\n");
> +
> + if (stackbuf == ms->irq_stackbuf)
> + FREEBUF(stackbuf);
> }
>
> -static int
> -arm64_unwind_frame(struct bt_info *bt, struct arm64_stackframe *frame)
> +/*
> + * (1)Normal frame:
> + * +------+
> + * | pfp |
> + * | cpc |
> + * psp + +
> + * | |
> + * | |
> + * pfp +------+ <--- :prev stackframe = <pfp, psp, ppc>
> + * | cfp |
> + * | npc |
> + * csp + +
> + * | |
> + * | |
> + * cfp +------+ <--- :curr stackframe = <cfp, csp, cpc>
> + * | nfp | | cfp = *pfp
> + * | Npc | | csp = pfp + 0x10
> + * nsp + + real stackframe
> + * | | | at cpc
> + * | | |
> + * nfp +------+ <--- :next stackframe = <nfp, nsp, npc>
> + * | |
> + *
> + * (2)Exception:
> + * +------+
> + * | pfp |
> + * | cpc |
> + * psp + +
> + * | |
> + * | |
> + * pfp +------+ <--- :prev stackframe = <pfp, psp, ppc>
> + * | cfp |
> + * | npc |
> + * csp + +
> + * | |
> + * | |
> + * cfp +------+ <--- :stackframe = <cfp, csp, cpc>
> + * | nfp |
> + * | epc |
> + * + +
> + * | |
> + * | | calced dummy
> + * esp +------+ <--- :exp stackframe = <---, esp, epc>
> + * | | esp = nsp - sizeof(pt_regs)
> + * | |
> + * | Npc |
> + * | nfp |
> + * | nsp |
> + * | npc |
> + * nsp + +
> + * | | calced missing
> + * nfp +------+ <--- :task stackframe = <nfp, nsp, npc>
> + * | Nfp |
> + * | NNpc |
> + * Nsp + +
> + * | |
> + * Nfp +------+ <--- :task stackframe = <Nfp, Nsp, Npc>
> + * | NNfp |
> + *
> + * (3)At interrupt:
> + * +------+
> + * | pfp |
> + * | cpc |
> + * psp + +
> + * | |
> + * | |
> + * pfp +------+ <--- :prev stackframe = <pfp, psp, ppc>
> + * | cfp |
> + * | epc |
> + * csp + +
> + * | |
> + * | | calced dummy
> + * cfp +------+ <--- :irq stackframe = <cfp, csp, epc>
> + * | nfp | | if (cfp == IRQ_STACK_PTR)
> + * | esp | V
> + * top +------+ <---, esp, epc>
> + * IRQ stack
> + *
> + * calced dummy
> + * esp +------+ <--- :exp stackframe = <---, esp, epc>
> + * | | esp = nsp - sizeof(pt_regs)
> + * | |
> + * | Npc |
> + * | nfp |
> + * | nsp |
> + * | npc | calced missing
> + * nfp +------+ <--- :task stackframe = <nfp, nsp, npc>
> + * | Nfp |
> + * | NNpc |
> + * Nsp + +
> + * | |
> + * Nfp +------+ <--- :task stackframe = <Nfp, Nsp, Npc>
> + * | NNfp |
> + */
> +
> +static struct arm64_stackframe ext_frame;
> +
> +static int
> +arm64_unwind_frame(struct bt_info *bt, struct arm64_stackframe *frame,
> + FILE *ofp)
> {
> unsigned long high, low, fp;
> unsigned long stack_mask;
> unsigned long irq_stack_ptr, orig_sp;
> - struct arm64_pt_regs *ptregs;
> struct machine_specific *ms;
>
> stack_mask = (unsigned long)(ARM64_STACK_SIZE) - 1;
> @@ -1593,54 +1738,101 @@ arm64_unwind_frame(struct bt_info *bt, struct
> arm64_stackframe *frame)
> if (fp < low || fp > high || fp & 0xf)
> return FALSE;
>
> - frame->sp = fp + 0x10;
> - frame->fp = GET_STACK_ULONG(fp);
> + if (CRASHDEBUG(1))
> + fprintf(ofp, " cur fp:%016lx sp:%016lx pc:%016lx\n",
> + frame->fp, frame->sp, frame->pc);
> +
> + if (ext_frame.pc) {
> + /*
> + * Previous frame was a dummy for exception entry.
> + * So insert a hidden (real) stackframe.
> + */
> + frame->fp = ext_frame.fp;
> + frame->sp = ext_frame.sp;
> + frame->pc = ext_frame.pc;
> +
> + ext_frame.pc = 0; /* back to normal unwinding */
> +
> + goto unwind_done;
> + }
> +
> frame->pc = GET_STACK_ULONG(fp + 8);
> + if (!arm64_in_exp_entry(frame->pc)) {
> + /* Normal stack frame */
>
> - /*
> - * The kernel's manner of determining the end of the IRQ stack:
> - *
> - * #define THREAD_SIZE 16384
> - * #define THREAD_START_SP (THREAD_SIZE - 16)
> - * #define IRQ_STACK_START_SP THREAD_START_SP
> - * #define IRQ_STACK_PTR(cpu) ((unsigned long)per_cpu(irq_stack, cpu) +
> IRQ_STACK_START_SP)
> - * #define IRQ_STACK_TO_TASK_STACK(ptr) (*((unsigned long *)((ptr) -
> 0x08)))
> - *
> - * irq_stack_ptr = IRQ_STACK_PTR(raw_smp_processor_id());
> - * orig_sp = IRQ_STACK_TO_TASK_STACK(irq_stack_ptr); (pt_regs pointer on
> process stack)
> - */
> - if (machdep->flags & IRQ_STACKS) {
> - ms = machdep->machspec;
> - irq_stack_ptr = ms->irq_stacks[bt->tc->processor] + ms->irq_stack_size -
> 16;
> -
> - if (frame->sp == irq_stack_ptr) {
> - orig_sp = GET_STACK_ULONG(irq_stack_ptr - 8);
> - arm64_set_process_stack(bt);
> - if (INSTACK(orig_sp, bt) && (INSTACK(frame->fp, bt) || (frame->fp == 0)))
> {
> - ptregs = (struct arm64_pt_regs
> *)&bt->stackbuf[(ulong)(STACK_OFFSET_TYPE(orig_sp))];
> - frame->sp = orig_sp;
> - frame->pc = ptregs->pc;
> - bt->bptr = fp;
> - if (CRASHDEBUG(1))
> - error(INFO,
> - "arm64_unwind_frame: switch stacks: fp: %lx sp: %lx pc: %lx\n",
> - frame->fp, frame->sp, frame->pc);
> + frame->sp = fp + 0x10;
> + frame->fp = GET_STACK_ULONG(fp);
> + } else {
> + /*
> + * We are in exception entry code, and so need to
> + * - fake a dummy frame for exception frame, and
> + * - complement a stackframe hidden by exception
> + */
> +
> + ext_frame.fp = GET_STACK_ULONG(fp);
> + if (ext_frame.fp == 0) {
> + /*
> + * Either on process stack or on IRQ stack,
> + * the next frame is the last one on process stack.
> + */
> +
> + frame->sp = bt->stacktop
> + - sizeof(struct arm64_pt_regs) - 0x10;
> + frame->fp = frame->sp;
> + } else if (!machdep->flags & IRQ_STACKS) {
> + /*
> + * We are on process stack. Just fake a dummy frame
> + */
> +
> + frame->sp = ext_frame.fp
> + - sizeof(struct arm64_pt_regs);
> + frame->fp = frame->sp;
> + } else {
> + /* We are on IRQ stack */
> +
> + ms = machdep->machspec;
> + irq_stack_ptr = ms->irq_stacks[bt->tc->processor]
> + + ms->irq_stack_size - 0x20;
> + if (ext_frame.fp != irq_stack_ptr) {
> + /* Just fake a dummy frame */
> +
> + frame->sp = ext_frame.fp
> + - sizeof(struct arm64_pt_regs);
> + frame->fp = frame->sp;
> } else {
> - error(WARNING,
> - "arm64_unwind_frame: on IRQ stack: oriq_sp: %lx%s fp: %lx%s\n",
> - orig_sp, INSTACK(orig_sp, bt) ? "" : " (?)",
> - frame->fp, INSTACK(frame->fp, bt) ? "" : " (?)");
> - return FALSE;
> + /*
> + * switch from IRQ stack to process stack
> + */
> +
> + frame->sp = GET_STACK_ULONG(irq_stack_ptr + 8);
> + frame->fp = frame->sp;
> +
> + /*
> + * Keep a buffer for a while until
> + * displaying the last frame on IRQ stack.
> + * Ugly?
> + */
> + if (bt->flags | BT_FULL)
> + ms->irq_stackbuf = bt->stackbuf;
> +
> + arm64_set_process_stack(bt);
> }
> }
> +
> + arm64_gen_hidden_frame(bt, frame->sp, &ext_frame);
> }
>
> +unwind_done:
> + if (CRASHDEBUG(1))
> + fprintf(ofp, " nxt fp:%016lx sp:%016lx pc:%016lx\n",
> + frame->fp, frame->sp, frame->pc);
> +
> return TRUE;
> }
>
> -/*
> +/*
> * A layout of a stack frame in a function looks like:
> - *
> + *
> * stack grows to lower addresses.
> * /|\
> * |
> @@ -1658,7 +1850,7 @@ arm64_unwind_frame(struct bt_info *bt, struct
> arm64_stackframe *frame)
> * | vars |
> * old fp +------+
> * | |
> - *
> + *
> * - On function entry, sp is decremented down to new fp.
> *
> * - and old fp and sp are saved into this stack frame.
> @@ -1680,13 +1872,13 @@ arm64_unwind_frame(struct bt_info *bt, struct
> arm64_stackframe *frame)
> * sp shows "callee's static local variables", old fp and sp.
> *
> * Diagram and explanation courtesy of Takahiro Akashi
> - */
> + */
>
> static void
> arm64_back_trace_cmd(struct bt_info *bt)
> {
> - struct arm64_stackframe stackframe;
> - int level;
> + struct arm64_stackframe stackframe, cur_frame;
> + int level, mode;
> ulong exception_frame;
> FILE *ofp;
>
> @@ -1708,17 +1900,7 @@ arm64_back_trace_cmd(struct bt_info *bt)
> stackframe.fp = GET_STACK_ULONG(bt->bptr - 8);
> stackframe.pc = GET_STACK_ULONG(bt->bptr);
> stackframe.sp = bt->bptr + 8;
> - bt->frameptr = stackframe.sp;
> - } else if (bt->hp && bt->hp->esp) {
> - if (arm64_on_irq_stack(bt->tc->processor, bt->hp->esp)) {
> - arm64_set_irq_stack(bt);
> - bt->flags |= BT_IRQSTACK;
> - }
> - stackframe.fp = GET_STACK_ULONG(bt->hp->esp - 8);
> - stackframe.pc = bt->hp->eip ?
> - bt->hp->eip : GET_STACK_ULONG(bt->hp->esp);
> - stackframe.sp = bt->hp->esp + 8;
> - bt->flags &= ~BT_REGS_NOT_FOUND;
> + bt->frameptr = stackframe.fp;
> } else {
> stackframe.sp = bt->stkptr;
> stackframe.pc = bt->instptr;
> @@ -1739,8 +1921,14 @@ arm64_back_trace_cmd(struct bt_info *bt)
> return;
>
> if (!(bt->flags & BT_KDUMP_ADJUST)) {
> - if (bt->flags & BT_USER_SPACE)
> - goto complete_user;
> + if (bt->flags & BT_USER_SPACE) {
> + exception_frame = bt->stacktop - USER_EFRAME_OFFSET;
> + arm64_print_exception_frame(bt, exception_frame,
> + USER_MODE, ofp);
> + fprintf(ofp, " #0 [user space]\n");
> +
> + return;
> + }
>
> if (DUMPFILE() && is_task_active(bt->task)) {
> exception_frame = stackframe.fp - SIZE(pt_regs);
> @@ -1750,53 +1938,55 @@ arm64_back_trace_cmd(struct bt_info *bt)
> }
> }
>
> - level = exception_frame = 0;
> - while (1) {
> + for (level = 0;; level++) {
> bt->instptr = stackframe.pc;
>
> - switch (arm64_print_stackframe_entry(bt, level, &stackframe, ofp))
> - {
> - case BACKTRACE_COMPLETE_KERNEL:
> - return;
> - case BACKTRACE_COMPLETE_USER:
> - goto complete_user;
> - case BACKTRACE_CONTINUE:
> + /*
> + * Show one-line stackframe info
> + */
> + if (arm64_print_stackframe_entry(bt, level, &stackframe, ofp)
> + == BACKTRACE_COMPLETE_KERNEL)
> break;
> - }
> -
> - if (exception_frame) {
> - arm64_print_exception_frame(bt, exception_frame, KERNEL_MODE, ofp);
> - exception_frame = 0;
> - }
>
> - if (!arm64_unwind_frame(bt, &stackframe))
> + cur_frame = stackframe;
> + if (!arm64_unwind_frame(bt, &stackframe, ofp))
> break;
>
> - if (arm64_in_exception_text(bt->instptr) && INSTACK(stackframe.fp, bt)) {
> - if (!(bt->flags & BT_IRQSTACK) ||
> - (((stackframe.sp + SIZE(pt_regs)) < bt->stacktop)))
> - exception_frame = stackframe.fp - SIZE(pt_regs);
> - }
> + /*
> + * Dump the contents of the current stackframe.
> + * We need to know the next stackframe to determine
> + * the dump range:
> + * <cur_frame.fp:stackframe.fp>
> + */
> + arm64_display_full_frame(bt, &cur_frame, &stackframe);
>
> - if ((bt->flags & BT_IRQSTACK) &&
> - !arm64_on_irq_stack(bt->tc->processor, stackframe.sp)) {
> - bt->flags &= ~BT_IRQSTACK;
> - if (arm64_switch_stack(bt, &stackframe, ofp) == USER_MODE)
> - break;
> - }
> + /*
> + * If we are in a normal stackframe, just continue,
> + * otherwise show an exception frame.
> + * Since exception entry code doesn't have a real
> + * stackframe, we fake a dummy frame here.
> + */
> + if (!arm64_in_exp_entry(stackframe.pc))
> + continue;
>
> + if (!INSTACK(cur_frame.sp, bt))
> + fprintf(ofp, "--- <IRQ stack> ---\n");
>
> - level++;
> - }
> + arm64_print_stackframe_entry(bt, ++level, &stackframe, ofp);
> + cur_frame = stackframe;
> + arm64_unwind_frame(bt, &stackframe, ofp);
>
> - if (is_kernel_thread(bt->tc->task))
> - return;
> + /*
> + * and don't show the contenxts. Instead,
> + * show an exception frame below
> + */
> + mode = (stackframe.pc < machdep->machspec->userspace_top) ?
> + USER_MODE : KERNEL_MODE;
> + arm64_print_exception_frame(bt, cur_frame.sp, mode, ofp);
>
> -complete_user:
> - exception_frame = bt->stacktop - USER_EFRAME_OFFSET;
> - arm64_print_exception_frame(bt, exception_frame, USER_MODE, ofp);
> - if ((bt->flags & (BT_USER_SPACE|BT_KDUMP_ADJUST)) == BT_USER_SPACE)
> - fprintf(ofp, " #0 [user space]\n");
> + if (mode == USER_MODE)
> + break;
> + }
> }
>
> static void
> @@ -1932,41 +2122,6 @@ arm64_in_kdump_text_on_irq_stack(struct bt_info *bt)
> return FALSE;
> }
>
> -static int
> -arm64_switch_stack(struct bt_info *bt, struct arm64_stackframe *frame, FILE
> *ofp)
> -{
> - int i;
> - ulong stacktop, words, addr;
> - ulong *stackbuf;
> - char buf[BUFSIZE];
> - struct machine_specific *ms = machdep->machspec;
> -
> - if (bt->flags & BT_FULL) {
> - stacktop = ms->irq_stacks[bt->tc->processor] + ms->irq_stack_size;
> - words = (stacktop - bt->bptr) / sizeof(ulong);
> - stackbuf = (ulong *)GETBUF(words * sizeof(ulong));
> - readmem(bt->bptr, KVADDR, stackbuf, words * sizeof(long),
> - "top of IRQ stack", FAULT_ON_ERROR);
> -
> - addr = bt->bptr;
> - for (i = 0; i < words; i++) {
> - if (!(i & 1))
> - fprintf(ofp, "%s %lx: ", i ? "\n" : "", addr);
> - fprintf(ofp, "%s ", format_stack_entry(bt, buf, stackbuf[i], 0));
> - addr += sizeof(ulong);
> - }
> - fprintf(ofp, "\n");
> - FREEBUF(stackbuf);
> - }
> - fprintf(ofp, "--- <IRQ stack> ---\n");
> -
> - if (frame->fp == 0)
> - return USER_MODE;
> -
> - arm64_print_exception_frame(bt, frame->sp, KERNEL_MODE, ofp);
> - return KERNEL_MODE;
> -}
> -
> static int
> arm64_get_dumpfile_stackframe(struct bt_info *bt, struct arm64_stackframe
> *frame)
> {
> @@ -2047,6 +2202,20 @@ arm64_get_stack_frame(struct bt_info *bt, ulong *pcp,
> ulong *spp)
> }
>
> static void
> +arm64_gen_hidden_frame(struct bt_info *bt, ulong sp,
> + struct arm64_stackframe *frame)
> +{
> + struct arm64_pt_regs *ptregs;
> +
> + ptregs = (struct arm64_pt_regs *)
> + &bt->stackbuf[(ulong)(STACK_OFFSET_TYPE(sp))];
> +
> + frame->pc = ptregs->pc;
> + frame->fp = ptregs->regs[29];
> + frame->sp = ptregs->sp;
> +}
> +
> +static void
> arm64_print_exception_frame(struct bt_info *bt, ulong pt_regs, int mode,
> FILE *ofp)
> {
> int i, r, rows, top_reg, is_64_bit;
> @@ -2055,10 +2224,16 @@ arm64_print_exception_frame(struct bt_info *bt, ulong
> pt_regs, int mode, FILE *o
> ulong LR, SP, offset;
> char buf[BUFSIZE];
>
> + if (mode == KERNEL_MODE)
> + fprintf(ofp, "--- <Exception in kernel> ---\n");
> + else
> + fprintf(ofp, "--- <Exception in user> ---\n");
> +
> if (CRASHDEBUG(1))
> fprintf(ofp, "pt_regs: %lx\n", pt_regs);
>
> - regs = (struct arm64_pt_regs
> *)&bt->stackbuf[(ulong)(STACK_OFFSET_TYPE(pt_regs))];
> + regs = (struct arm64_pt_regs *)
> + &bt->stackbuf[(ulong)(STACK_OFFSET_TYPE(pt_regs))];
>
> if ((mode == USER_MODE) && (regs->pstate & PSR_MODE32_BIT)) {
> LR = regs->regs[14];
> @@ -2130,10 +2305,11 @@ arm64_print_exception_frame(struct bt_info *bt, ulong
> pt_regs, int mode, FILE *o
> }
>
> if (is_64_bit) {
> - fprintf(ofp, "ORIG_X0: %016lx SYSCALLNO: %lx",
> - (ulong)regs->orig_x0, (ulong)regs->syscallno);
> - if (mode == USER_MODE)
> + if (mode == USER_MODE) {
> + fprintf(ofp, "ORIG_X0: %016lx SYSCALLNO: %lx",
> + (ulong)regs->orig_x0, (ulong)regs->syscallno);
> fprintf(ofp, " PSTATE: %08lx", (ulong)regs->pstate);
> + }
> fprintf(ofp, "\n");
> }
>
> diff --git a/defs.h b/defs.h
> index d6f719c..f7ea5a0 100644
> --- a/defs.h
> +++ b/defs.h
> @@ -3058,8 +3058,14 @@ struct machine_specific {
> ulong kernel_flags;
> ulong irq_stack_size;
> ulong *irq_stacks;
> + char *irq_stackbuf;
> ulong __irqentry_text_start;
> ulong __irqentry_text_end;
> + /* for exception vector code */
> + ulong exp_entry1_start;
> + ulong exp_entry1_end;
> + ulong exp_entry2_start;
> + ulong exp_entry2_end;
> /* only needed for v4.6 or later kernel */
> ulong kimage_voffset;
> ulong kimage_text;
> --
> 2.9.0
>
> --
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> Crash-utility at redhat.com
> https://www.redhat.com/mailman/listinfo/crash-utility
>
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