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mips64.c
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mips64.c
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/* mips64.c - core analysis suite
*
* Copyright (C) 2021 Loongson Technology Co., Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifdef MIPS64
#include <elf.h>
#include "defs.h"
static void mips64_init_page_flags(void);
static int mips64_translate_pte(ulong pte, void *physaddr,
ulonglong pte64);
static int mips64_pgd_vtop(ulong *pgd, ulong vaddr,
physaddr_t *paddr, int verbose);
static int mips64_uvtop(struct task_context *tc, ulong vaddr,
physaddr_t *paddr, int verbose);
static int mips64_kvtop(struct task_context *tc, ulong kvaddr,
physaddr_t *paddr, int verbose);
static void mips64_cmd_mach(void);
static void mips64_display_machine_stats(void);
static void mips64_back_trace_cmd(struct bt_info *bt);
static void mips64_analyze_function(ulong start, ulong offset,
struct mips64_unwind_frame *current,
struct mips64_unwind_frame *previous);
static void mips64_dump_backtrace_entry(struct bt_info *bt,
struct syment *sym, struct mips64_unwind_frame *current,
struct mips64_unwind_frame *previous, int level);
static void mips64_dump_exception_stack(struct bt_info *bt, char *pt_regs);
static int mips64_is_exception_entry(struct syment *sym);
static void mips64_display_full_frame(struct bt_info *bt,
struct mips64_unwind_frame *current,
struct mips64_unwind_frame *previous);
static void mips64_stackframe_init(void);
static void mips64_get_stack_frame(struct bt_info *bt, ulong *pcp, ulong *spp);
static int mips64_get_dumpfile_stack_frame(struct bt_info *bt,
ulong *nip, ulong *ksp);
static int mips64_get_frame(struct bt_info *bt, ulong *pcp, ulong *spp);
static int mips64_init_active_task_regs(void);
static int mips64_get_crash_notes(void);
static int mips64_get_elf_notes(void);
/*
* 3 Levels paging PAGE_SIZE=16KB
* PGD | PMD | PTE | OFFSET |
* 11 | 11 | 11 | 14 |
*/
/* From arch/mips/include/asm/pgtable{,-64}.h */
typedef struct { ulong pgd; } pgd_t;
typedef struct { ulong pmd; } pmd_t;
typedef struct { ulong pte; } pte_t;
#define PMD_ORDER 0
#define PTE_ORDER 0
#define PMD_SHIFT (PAGESHIFT() + (PAGESHIFT() + PTE_ORDER - 3))
#define PMD_SIZE (1UL << PMD_SHIFT)
#define PMD_MASK (~(PMD_SIZE - 1))
#define PGDIR_SHIFT (PMD_SHIFT + (PAGESHIFT() + PMD_ORDER - 3))
#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
#define PGDIR_MASK (~(PGDIR_SIZE - 1))
#define PTRS_PER_PTE (1UL << (PAGESHIFT() - 3))
#define PTRS_PER_PMD PTRS_PER_PTE
#define PTRS_PER_PGD PTRS_PER_PTE
#define USER_PTRS_PER_PGD (0x80000000UL/PGDIR_SIZE)
#define pte_index(addr) (((addr) >> PAGESHIFT()) & (PTRS_PER_PTE - 1))
#define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
#define pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
#define MIPS64_CPU_RIXI (1UL << 23) /* CPU has TLB Read/eXec Inhibit */
/* From arch/mips/include/uapi/asm/reg.h */
#define MIPS64_EF_R0 0
#define MIPS64_EF_R29 29
#define MIPS64_EF_R31 31
#define MIPS64_EF_LO 32
#define MIPS64_EF_HI 33
#define MIPS64_EF_CP0_EPC 34
#define MIPS64_EF_CP0_BADVADDR 35
#define MIPS64_EF_CP0_STATUS 36
#define MIPS64_EF_CP0_CAUSE 37
static struct machine_specific mips64_machine_specific = { 0 };
/*
* Holds registers during the crash.
*/
static struct mips64_register *panic_task_regs;
/*
* 31 15 14 12 11 10 9 8 7 6 5 4 3 2 1 0
* +-------------------+--------+--+--+--+--+--+--+--+--+--+--+--+--+
* | VPN | C | D| V| G|RI|XI|SP|PN| H| M| A| W| P|
* +-------------------+--------+--+--+--+--+--+--+--+--+--+--+--+--+
*/
static void
mips64_init_page_flags(void)
{
ulong shift = 0;
_PAGE_PRESENT = 1UL << shift++;
_PAGE_WRITE = 1UL << shift++;
_PAGE_ACCESSED = 1UL << shift++;
_PAGE_MODIFIED = 1UL << shift++;
_PAGE_HUGE = 1UL << shift++;
_PAGE_PROTNONE = 1UL << shift++;
if (THIS_KERNEL_VERSION >= LINUX(4,5,0))
_PAGE_SPECIAL = 1UL << shift++;
_PAGE_NO_EXEC = 1UL << shift++;
_PAGE_NO_READ = _PAGE_READ = 1UL << shift++;
_PAGE_GLOBAL = 1UL << shift++;
_PAGE_VALID = 1UL << shift++;
_PAGE_DIRTY = 1UL << shift++;
_PFN_SHIFT = PAGESHIFT() - 12 + shift + 3;
}
/*
* Translate a PTE, returning TRUE if the page is present.
* If a physaddr pointer is passed in, don't print anything.
*/
static int
mips64_translate_pte(ulong pte, void *physaddr, ulonglong pte64)
{
char ptebuf[BUFSIZE];
char physbuf[BUFSIZE];
char buf[BUFSIZE];
int page_present;
int len1, len2, others;
ulong paddr;
paddr = PTOB(pte >> _PFN_SHIFT);
page_present = !!(pte & _PAGE_PRESENT);
if (physaddr) {
*(ulong *)physaddr = paddr;
return page_present;
}
sprintf(ptebuf, "%lx", pte);
len1 = MAX(strlen(ptebuf), strlen("PTE"));
fprintf(fp, "%s ", mkstring(buf, len1, CENTER | LJUST, "PTE"));
if (!page_present)
return page_present;
sprintf(physbuf, "%lx", paddr);
len2 = MAX(strlen(physbuf), strlen("PHYSICAL"));
fprintf(fp, "%s ", mkstring(buf, len2, CENTER | LJUST, "PHYSICAL"));
fprintf(fp, "FLAGS\n");
fprintf(fp, "%s %s ",
mkstring(ptebuf, len1, CENTER | RJUST, NULL),
mkstring(physbuf, len2, CENTER | RJUST, NULL));
fprintf(fp, "(");
others = 0;
#define CHECK_PAGE_FLAG(flag) \
if ((_PAGE_##flag) && (pte & _PAGE_##flag)) \
fprintf(fp, "%s" #flag, others++ ? "|" : "")
if (pte) {
CHECK_PAGE_FLAG(PRESENT);
CHECK_PAGE_FLAG(WRITE);
CHECK_PAGE_FLAG(ACCESSED);
CHECK_PAGE_FLAG(MODIFIED);
CHECK_PAGE_FLAG(HUGE);
CHECK_PAGE_FLAG(PROTNONE);
CHECK_PAGE_FLAG(SPECIAL);
CHECK_PAGE_FLAG(NO_EXEC);
CHECK_PAGE_FLAG(NO_READ);
CHECK_PAGE_FLAG(READ);
CHECK_PAGE_FLAG(GLOBAL);
CHECK_PAGE_FLAG(VALID);
CHECK_PAGE_FLAG(DIRTY);
} else {
fprintf(fp, "no mapping");
}
fprintf(fp, ")\n");
return page_present;
}
/*
* Virtual to physical memory translation. This function will be called
* by both mips64_kvtop and mips64_uvtop.
*/
static int
mips64_pgd_vtop(ulong *pgd, ulong vaddr, physaddr_t *paddr, int verbose)
{
ulong *pgd_ptr, pgd_val;
ulong *pmd_ptr, pmd_val;
ulong *pte_ptr, pte_val;
if (verbose) {
const char *segment;
if (vaddr < 0x4000000000000000lu)
segment = "xuseg";
else if (vaddr < 0x8000000000000000lu)
segment = "xsseg";
else if (vaddr < 0xc000000000000000lu)
segment = "xkphys";
else if (vaddr < 0xffffffff80000000lu)
segment = "xkseg";
else if (vaddr < 0xffffffffa0000000lu)
segment = "kseg0";
else if (vaddr < 0xffffffffc0000000lu)
segment = "kseg1";
else if (vaddr < 0xffffffffe0000000lu)
segment = "sseg";
else
segment = "kseg3";
fprintf(fp, "SEGMENT: %s\n", segment);
}
if (IS_CKPHYS(vaddr) || IS_XKPHYS(vaddr)) {
*paddr = VTOP(vaddr);
return TRUE;
}
if (verbose)
fprintf(fp, "PAGE DIRECTORY: %016lx\n", (ulong)pgd);
pgd_ptr = pgd + pgd_index(vaddr);
FILL_PGD(PAGEBASE(pgd), KVADDR, PAGESIZE());
pgd_val = ULONG(machdep->pgd + PAGEOFFSET(pgd_ptr));
if (verbose)
fprintf(fp, " PGD: %16lx => %16lx\n", (ulong)pgd_ptr, pgd_val);
if (!pgd_val)
goto no_page;
pmd_ptr = (ulong *)(VTOP(pgd_val) + sizeof(pmd_t) * pmd_index(vaddr));
FILL_PMD(PAGEBASE(pmd_ptr), PHYSADDR, PAGESIZE());
pmd_val = ULONG(machdep->pmd + PAGEOFFSET(pmd_ptr));
if (verbose)
fprintf(fp, " PMD: %016lx => %016lx\n", (ulong)pmd_ptr, pmd_val);
if (!pmd_val)
goto no_page;
pte_ptr = (ulong *)(VTOP(pmd_val) + sizeof(pte_t) * pte_index(vaddr));
FILL_PTBL(PAGEBASE(pte_ptr), PHYSADDR, PAGESIZE());
pte_val = ULONG(machdep->ptbl + PAGEOFFSET(pte_ptr));
if (verbose)
fprintf(fp, " PTE: %016lx => %016lx\n", (ulong)pte_ptr, pte_val);
if (!pte_val)
goto no_page;
if (!(pte_val & _PAGE_PRESENT)) {
if (verbose) {
fprintf(fp, "\n");
mips64_translate_pte((ulong)pte_val, 0, pte_val);
}
return FALSE;
}
*paddr = PTOB(pte_val >> _PFN_SHIFT) + PAGEOFFSET(vaddr);
if (verbose) {
fprintf(fp, " PAGE: %016lx\n\n", PAGEBASE(*paddr));
mips64_translate_pte(pte_val, 0, 0);
}
return TRUE;
no_page:
fprintf(fp, "invalid\n");
return FALSE;
}
/* Translates a user virtual address to its physical address. cmd_vtop() sets
* the verbose flag so that the pte translation gets displayed; all other
* callers quietly accept the translation.
*/
static int
mips64_uvtop(struct task_context *tc, ulong vaddr, physaddr_t *paddr, int verbose)
{
ulong mm, active_mm;
ulong *pgd;
if (!tc)
error(FATAL, "current context invalid\n");
*paddr = 0;
if (is_kernel_thread(tc->task) && IS_KVADDR(vaddr)) {
readmem(tc->task + OFFSET(task_struct_active_mm),
KVADDR, &active_mm, sizeof(void *),
"task active_mm contents", FAULT_ON_ERROR);
if (!active_mm)
error(FATAL,
"no active_mm for this kernel thread\n");
readmem(active_mm + OFFSET(mm_struct_pgd),
KVADDR, &pgd, sizeof(long),
"mm_struct pgd", FAULT_ON_ERROR);
} else {
if ((mm = task_mm(tc->task, TRUE)))
pgd = ULONG_PTR(tt->mm_struct + OFFSET(mm_struct_pgd));
else
readmem(tc->mm_struct + OFFSET(mm_struct_pgd),
KVADDR, &pgd, sizeof(long), "mm_struct pgd",
FAULT_ON_ERROR);
}
return mips64_pgd_vtop(pgd, vaddr, paddr, verbose);;
}
/* Translates a user virtual address to its physical address. cmd_vtop() sets
* the verbose flag so that the pte translation gets displayed; all other
* callers quietly accept the translation.
*/
static int
mips64_kvtop(struct task_context *tc, ulong kvaddr, physaddr_t *paddr, int verbose)
{
if (!IS_KVADDR(kvaddr))
return FALSE;
if (!verbose) {
if (IS_CKPHYS(kvaddr) || IS_XKPHYS(kvaddr)) {
*paddr = VTOP(kvaddr);
return TRUE;
}
}
return mips64_pgd_vtop((ulong *)vt->kernel_pgd[0], kvaddr, paddr,
verbose);
}
/*
* Machine dependent command.
*/
static void
mips64_cmd_mach(void)
{
int c;
while ((c = getopt(argcnt, args, "cmo")) != EOF) {
switch (c) {
case 'c':
case 'm':
case 'o':
option_not_supported(c);
break;
default:
argerrs++;
break;
}
}
if (argerrs)
cmd_usage(pc->curcmd, SYNOPSIS);
mips64_display_machine_stats();
}
/*
* "mach" command output.
*/
static void
mips64_display_machine_stats(void)
{
struct new_utsname *uts;
char buf[BUFSIZE];
ulong mhz;
uts = &kt->utsname;
fprintf(fp, " MACHINE TYPE: %s\n", uts->machine);
fprintf(fp, " MEMORY SIZE: %s\n", get_memory_size(buf));
fprintf(fp, " CPUS: %d\n", get_cpus_to_display());
fprintf(fp, " PROCESSOR SPEED: ");
if ((mhz = machdep->processor_speed()))
fprintf(fp, "%ld Mhz\n", mhz);
else
fprintf(fp, "(unknown)\n");
fprintf(fp, " HZ: %d\n", machdep->hz);
fprintf(fp, " PAGE SIZE: %d\n", PAGESIZE());
fprintf(fp, " KERNEL STACK SIZE: %ld\n", STACKSIZE());
}
/*
* Unroll a kernel stack.
*/
static void
mips64_back_trace_cmd(struct bt_info *bt)
{
struct mips64_unwind_frame current, previous;
struct mips64_register *regs;
struct mips64_pt_regs_main *mains;
struct mips64_pt_regs_cp0 *cp0;
char pt_regs[SIZE(pt_regs)];
int level = 0;
int invalid_ok = 1;
if (bt->flags & BT_REGS_NOT_FOUND)
return;
previous.sp = previous.pc = previous.ra = 0;
current.pc = bt->instptr;
current.sp = bt->stkptr;
current.ra = 0;
if (!INSTACK(current.sp, bt))
return;
if (bt->machdep) {
regs = bt->machdep;
previous.pc = current.ra = regs->regs[MIPS64_EF_R31];
}
while (current.sp <= bt->stacktop - 32 - SIZE(pt_regs)) {
struct syment *symbol = NULL;
ulong offset;
if (CRASHDEBUG(8))
fprintf(fp, "level %d pc %#lx ra %#lx sp %lx\n",
level, current.pc, current.ra, current.sp);
if (!IS_KVADDR(current.pc) && !invalid_ok)
return;
symbol = value_search(current.pc, &offset);
if (!symbol && !invalid_ok) {
error(FATAL, "PC is unknown symbol (%lx)", current.pc);
return;
}
invalid_ok = 0;
/*
* If we get an address which points to the start of a
* function, then it could one of the following:
*
* - we are dealing with a noreturn function. The last call
* from a noreturn function has an ra which points to the
* start of the function after it. This is common in the
* oops callchain because of die() which is annotated as
* noreturn.
*
* - we have taken an exception at the start of this function.
* In this case we already have the RA in current.ra.
*
* - we are in one of these routines which appear with zero
* offset in manually-constructed stack frames:
*
* * ret_from_exception
* * ret_from_irq
* * ret_from_fork
* * ret_from_kernel_thread
*/
if (symbol && !STRNEQ(symbol->name, "ret_from") && !offset &&
!current.ra && current.sp < bt->stacktop - 32 - SIZE(pt_regs)) {
if (CRASHDEBUG(8))
fprintf(fp, "zero offset at %s, try previous symbol\n",
symbol->name);
symbol = value_search(current.pc - 4, &offset);
if (!symbol) {
error(FATAL, "PC is unknown symbol (%lx)", current.pc);
return;
}
}
if (symbol && mips64_is_exception_entry(symbol)) {
mains = (struct mips64_pt_regs_main *) \
(pt_regs + OFFSET(pt_regs_regs));
cp0 = (struct mips64_pt_regs_cp0 *) \
(pt_regs + OFFSET(pt_regs_cp0_badvaddr));
GET_STACK_DATA(current.sp, pt_regs, sizeof(pt_regs));
previous.ra = mains->regs[31];
previous.sp = mains->regs[29];
current.ra = cp0->cp0_epc;
if (CRASHDEBUG(8))
fprintf(fp, "exception pc %#lx ra %#lx sp %lx\n",
previous.pc, previous.ra, previous.sp);
/* The PC causing the exception may have been invalid */
invalid_ok = 1;
} else if (symbol) {
mips64_analyze_function(symbol->value, offset, ¤t, &previous);
} else {
/*
* The current PC is invalid. Assume that the code
* jumped through a invalid pointer and that the SP has
* not been adjusted.
*/
previous.sp = current.sp;
}
mips64_dump_backtrace_entry(bt, symbol, ¤t, &previous, level++);
current.pc = current.ra;
current.sp = previous.sp;
current.ra = previous.ra;
if (CRASHDEBUG(8))
fprintf(fp, "next %d pc %#lx ra %#lx sp %lx\n",
level, current.pc, current.ra, current.sp);
previous.sp = previous.pc = previous.ra = 0;
}
}
static void
mips64_analyze_function(ulong start, ulong offset,
struct mips64_unwind_frame *current,
struct mips64_unwind_frame *previous)
{
ulong i, reg;
ulong rapos = 0;
ulong spadjust = 0;
uint32_t *funcbuf, *ip;
if (CRASHDEBUG(8))
fprintf(fp, "%s: start %#lx offset %#lx\n",
__func__, start, offset);
if (!offset) {
previous->sp = current->sp;
return;
}
ip = funcbuf = (uint32_t *)GETBUF(offset);
if (!readmem(start, KVADDR, funcbuf, offset,
"mips64_analyze_function", RETURN_ON_ERROR)) {
FREEBUF(funcbuf);
error(WARNING, "Cannot read function at %16lx\n", start);
return;
}
for (i = 0; i < offset; i += 4) {
ulong insn = *ip & 0xffffffff;
ulong high = (insn >> 16) & 0xffff;
ulong low = insn & 0xffff;
if (CRASHDEBUG(8))
fprintf(fp, "insn @ %#lx = %#lx\n", start + i, insn);
if (high == 0x27bd || high == 0x67bd) { /* ADDIU/DADDIU sp, sp, imm */
if (!(low & 0x8000))
break;
spadjust += 0x10000 - low;
if (CRASHDEBUG(8))
fprintf(fp, "spadjust = %lu\n", spadjust);
} else if (high == 0xafbf) { /* SW RA, imm(SP) */
rapos = current->sp + low;
if (CRASHDEBUG(8))
fprintf(fp, "rapos %lx\n", rapos);
break;
} else if (high == 0xffbf) { /* SD RA, imm(SP) */
rapos = current->sp + low;
if (CRASHDEBUG(8))
fprintf(fp, "rapos %lx\n", rapos);
break;
} else if ((insn & 0xffe08020) == 0xeba00020) { /* GSSQ reg, reg, offset(SP) */
reg = (insn >> 16) & 0x1f;
if (reg == 31) {
low = ((((insn >> 6) & 0x1ff) ^ 0x100) - 0x100) << 4;
rapos = current->sp + low;
if (CRASHDEBUG(8))
fprintf(fp, "rapos %lx\n", rapos);
break;
}
reg = insn & 0x1f;
if (reg == 31) {
low = (((((insn >> 6) & 0x1ff) ^ 0x100) - 0x100) << 4) + 8;
rapos = current->sp + low;
if (CRASHDEBUG(8))
fprintf(fp, "rapos %lx\n", rapos);
break;
}
}
ip++;
}
FREEBUF(funcbuf);
previous->sp = current->sp + spadjust;
if (rapos && !readmem(rapos, KVADDR, ¤t->ra,
sizeof(current->ra), "RA from stack",
RETURN_ON_ERROR)) {
error(FATAL, "Cannot read RA from stack %lx", rapos);
return;
}
}
static void
mips64_dump_backtrace_entry(struct bt_info *bt, struct syment *sym,
struct mips64_unwind_frame *current,
struct mips64_unwind_frame *previous, int level)
{
const char *name = sym ? sym->name : "(invalid)";
struct load_module *lm;
char *name_plus_offset = NULL;
struct syment *symp;
ulong symbol_offset;
char buf[BUFSIZE];
char pt_regs[SIZE(pt_regs)];
if (bt->flags & BT_SYMBOL_OFFSET) {
symp = value_search(current->pc, &symbol_offset);
if (symp && symbol_offset)
name_plus_offset =
value_to_symstr(current->pc, buf, bt->radix);
}
fprintf(fp, "%s#%d [%016lx] %s at %016lx", level < 10 ? " " : "", level,
current->sp, name_plus_offset ? name_plus_offset : name,
current->pc);
if (module_symbol(current->pc, NULL, &lm, NULL, 0))
fprintf(fp, " [%s]", lm->mod_name);
fprintf(fp, "\n");
/*
* 'bt -l', get a line number associated with a current pc address.
*/
if (bt->flags & BT_LINE_NUMBERS) {
get_line_number(current->pc, buf, FALSE);
if (strlen(buf))
fprintf(fp, " %s\n", buf);
}
if (sym && mips64_is_exception_entry(sym)) {
GET_STACK_DATA(current->sp, &pt_regs, SIZE(pt_regs));
mips64_dump_exception_stack(bt, pt_regs);
}
/* bt -f */
if (bt->flags & BT_FULL) {
fprintf(fp, " "
"[PC: %016lx RA: %016lx SP: %016lx SIZE: %ld]\n",
current->pc, current->ra, current->sp,
previous->sp - current->sp);
mips64_display_full_frame(bt, current, previous);
}
}
static void
mips64_dump_exception_stack(struct bt_info *bt, char *pt_regs)
{
struct mips64_pt_regs_main *mains;
struct mips64_pt_regs_cp0 *cp0;
int i;
char buf[BUFSIZE];
mains = (struct mips64_pt_regs_main *) (pt_regs + OFFSET(pt_regs_regs));
cp0 = (struct mips64_pt_regs_cp0 *) \
(pt_regs + OFFSET(pt_regs_cp0_badvaddr));
for (i = 0; i < 32; i += 4) {
fprintf(fp, " $%2d : %016lx %016lx %016lx %016lx\n",
i, mains->regs[i], mains->regs[i+1],
mains->regs[i+2], mains->regs[i+3]);
}
fprintf(fp, " Hi : %016lx\n", mains->hi);
fprintf(fp, " Lo : %016lx\n", mains->lo);
value_to_symstr(cp0->cp0_epc, buf, 16);
fprintf(fp, " epc : %016lx %s\n", cp0->cp0_epc, buf);
value_to_symstr(mains->regs[31], buf, 16);
fprintf(fp, " ra : %016lx %s\n", mains->regs[31], buf);
fprintf(fp, " Status: %016lx\n", mains->cp0_status);
fprintf(fp, " Cause : %016lx\n", cp0->cp0_cause);
fprintf(fp, " BadVA : %016lx\n", cp0->cp0_badvaddr);
}
static int
mips64_is_exception_entry(struct syment *sym)
{
return STREQ(sym->name, "ret_from_exception") ||
STREQ(sym->name, "ret_from_irq") ||
STREQ(sym->name, "work_resched") ||
STREQ(sym->name, "handle_sys") ||
STREQ(sym->name, "handle_sysn32") ||
STREQ(sym->name, "handle_sys64");
}
/*
* 'bt -f' commend output
* Display all stack data contained in a frame
*/
static void
mips64_display_full_frame(struct bt_info *bt, struct mips64_unwind_frame *current,
struct mips64_unwind_frame *previous)
{
int i, u_idx;
ulong *up;
ulong words, addr;
char buf[BUFSIZE];
if (previous->sp < current->sp)
return;
if (!(INSTACK(previous->sp, bt) && INSTACK(current->sp, bt)))
return;
words = (previous->sp - current->sp) / sizeof(ulong) + 1;
addr = current->sp;
u_idx = (current->sp - bt->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)]);
fprintf(fp, "%s ", format_stack_entry(bt, buf, *up, 0));
addr += sizeof(ulong);
}
fprintf(fp, "\n");
}
static void
mips64_stackframe_init(void)
{
long task_struct_thread = MEMBER_OFFSET("task_struct", "thread");
long thread_reg29 = MEMBER_OFFSET("thread_struct", "reg29");
long thread_reg31 = MEMBER_OFFSET("thread_struct", "reg31");
if ((task_struct_thread == INVALID_OFFSET) ||
(thread_reg29 == INVALID_OFFSET) ||
(thread_reg31 == INVALID_OFFSET)) {
error(FATAL,
"cannot determine thread_struct offsets\n");
return;
}
ASSIGN_OFFSET(task_struct_thread_reg29) =
task_struct_thread + thread_reg29;
ASSIGN_OFFSET(task_struct_thread_reg31) =
task_struct_thread + thread_reg31;
STRUCT_SIZE_INIT(pt_regs, "pt_regs");
MEMBER_OFFSET_INIT(pt_regs_regs, "pt_regs", "regs");
MEMBER_OFFSET_INIT(pt_regs_cp0_badvaddr, "pt_regs", "cp0_badvaddr");
}
/*
* Get a stack frame combination of pc and ra from the most relevant spot.
*/
static void
mips64_get_stack_frame(struct bt_info *bt, ulong *pcp, ulong *spp)
{
ulong ksp, nip;
int ret = 0;
nip = ksp = 0;
bt->machdep = NULL;
if (DUMPFILE() && is_task_active(bt->task))
ret = mips64_get_dumpfile_stack_frame(bt, &nip, &ksp);
else
ret = mips64_get_frame(bt, &nip, &ksp);
if (!ret)
error(WARNING, "cannot determine starting stack frame for task %lx\n",
bt->task);
if (pcp)
*pcp = nip;
if (spp)
*spp = ksp;
}
/*
* Get the starting point for the active cpu in a diskdump.
*/
static int
mips64_get_dumpfile_stack_frame(struct bt_info *bt, ulong *nip, ulong *ksp)
{
const struct machine_specific *ms = machdep->machspec;
struct mips64_register *regs;
ulong epc, r29;
if (!ms->crash_task_regs) {
bt->flags |= BT_REGS_NOT_FOUND;
return FALSE;
}
/*
* We got registers for panic task from crash_notes. Just return them.
*/
regs = &ms->crash_task_regs[bt->tc->processor];
epc = regs->regs[MIPS64_EF_CP0_EPC];
r29 = regs->regs[MIPS64_EF_R29];
if (!epc && !r29) {
bt->flags |= BT_REGS_NOT_FOUND;
return FALSE;
}
if (nip)
*nip = epc;
if (ksp)
*ksp = r29;
bt->machdep = regs;
return TRUE;
}
/*
* Do the work for mips64_get_stack_frame() for non-active tasks.
* Get SP and PC values for idle tasks.
*/
static int
mips64_get_frame(struct bt_info *bt, ulong *pcp, ulong *spp)
{
if (!bt->tc || !(tt->flags & THREAD_INFO))
return FALSE;
if (!readmem(bt->task + OFFSET(task_struct_thread_reg31),
KVADDR, pcp, sizeof(*pcp),
"thread_struct.regs31",
RETURN_ON_ERROR)) {
return FALSE;
}
if (!readmem(bt->task + OFFSET(task_struct_thread_reg29),
KVADDR, spp, sizeof(*spp),
"thread_struct.regs29",
RETURN_ON_ERROR)) {
return FALSE;
}
return TRUE;
}
static int
mips64_init_active_task_regs(void)
{
int retval;
retval = mips64_get_crash_notes();
if (retval == TRUE)
return retval;
return mips64_get_elf_notes();
}
/*
* Retrieve task registers for the time of the crash.
*/
static int
mips64_get_crash_notes(void)
{
struct machine_specific *ms = machdep->machspec;
ulong crash_notes;
Elf64_Nhdr *note;
ulong offset;
char *buf, *p;
ulong *notes_ptrs;
ulong i;
/*
* crash_notes contains per cpu memory for storing cpu states
* in case of system crash.
*/
if (!symbol_exists("crash_notes"))
return FALSE;
crash_notes = symbol_value("crash_notes");
notes_ptrs = (ulong *)GETBUF(kt->cpus*sizeof(notes_ptrs[0]));
/*
* Read crash_notes for the first CPU. crash_notes are in standard ELF
* note format.
*/
if (!readmem(crash_notes, KVADDR, ¬es_ptrs[kt->cpus-1],
sizeof(notes_ptrs[kt->cpus-1]), "crash_notes",
RETURN_ON_ERROR)) {
error(WARNING, "cannot read crash_notes\n");
FREEBUF(notes_ptrs);
return FALSE;
}
if (symbol_exists("__per_cpu_offset")) {
/*
* Add __per_cpu_offset for each cpu to form the pointer to the notes
*/
for (i = 0; i < kt->cpus; i++)
notes_ptrs[i] = notes_ptrs[kt->cpus-1] + kt->__per_cpu_offset[i];
}
buf = GETBUF(SIZE(note_buf));
if (!(panic_task_regs = calloc((size_t)kt->cpus, sizeof(*panic_task_regs))))
error(FATAL, "cannot calloc panic_task_regs space\n");
for (i = 0; i < kt->cpus; i++) {
if (!readmem(notes_ptrs[i], KVADDR, buf, SIZE(note_buf), "note_buf_t",
RETURN_ON_ERROR)) {
error(WARNING,
"cannot find NT_PRSTATUS note for cpu: %d\n", i);
goto fail;
}
/*
* Do some sanity checks for this note before reading registers from it.
*/
note = (Elf64_Nhdr *)buf;
p = buf + sizeof(Elf64_Nhdr);
/*
* dumpfiles created with qemu won't have crash_notes, but there will
* be elf notes; dumpfiles created by kdump do not create notes for
* offline cpus.
*/
if (note->n_namesz == 0 && (DISKDUMP_DUMPFILE() || KDUMP_DUMPFILE())) {
if (DISKDUMP_DUMPFILE())
note = diskdump_get_prstatus_percpu(i);
else if (KDUMP_DUMPFILE())
note = netdump_get_prstatus_percpu(i);
if (note) {
/*
* SIZE(note_buf) accounts for a "final note", which is a
* trailing empty elf note header.
*/
long notesz = SIZE(note_buf) - sizeof(Elf64_Nhdr);
if (sizeof(Elf64_Nhdr) + roundup(note->n_namesz, 4) +
note->n_descsz == notesz)
BCOPY((char *)note, buf, notesz);
} else {
error(WARNING,
"cannot find NT_PRSTATUS note for cpu: %d\n", i);
continue;
}
}
/*
* Check the sanity of NT_PRSTATUS note only for each online cpu.
*/
if (note->n_type != NT_PRSTATUS) {
error(WARNING, "invalid NT_PRSTATUS note (n_type != NT_PRSTATUS)\n");
goto fail;
}
if (!STRNEQ(p, "CORE")) {
error(WARNING, "invalid NT_PRSTATUS note (name != \"CORE\"\n");
goto fail;
}
/*
* Find correct location of note data. This contains elf_prstatus
* structure which has registers etc. for the crashed task.
*/
offset = sizeof(Elf64_Nhdr);
offset = roundup(offset + note->n_namesz, 4);
p = buf + offset; /* start of elf_prstatus */
BCOPY(p + OFFSET(elf_prstatus_pr_reg), &panic_task_regs[i],
sizeof(panic_task_regs[i]));
}
/*
* And finally we have the registers for the crashed task. This is
* used later on when dumping backtrace.
*/
ms->crash_task_regs = panic_task_regs;
FREEBUF(buf);
FREEBUF(notes_ptrs);
return TRUE;
fail:
FREEBUF(buf);
FREEBUF(notes_ptrs);