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arm.c
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arm.c
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/*
* arm.c - core analysis suite
*
* Authors:
* Thomas Fänge <thomas.fange@sonyericsson.com>
* Jan Karlsson <jan.karlsson@sonyericsson.com>
* Mika Westerberg <ext-mika.1.westerberg@nokia.com>
*
* Copyright (C) 2010-2011 Nokia Corporation
* Copyright (C) 2010 Sony Ericsson. All rights reserved.
*
* 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 ARM
#include <elf.h>
#include "defs.h"
static void arm_parse_cmdline_args(void);
static int arm_get_crash_notes(void);
static int arm_verify_symbol(const char *, ulong, char);
static int arm_is_module_addr(ulong);
static int arm_is_kvaddr(ulong);
static int arm_is_uvaddr(ulong, struct task_context *);
static int arm_in_exception_text(ulong);
static int arm_in_ret_from_syscall(ulong, int *);
static void arm_back_trace(struct bt_info *);
static void arm_back_trace_cmd(struct bt_info *);
static ulong arm_processor_speed(void);
static int arm_translate_pte(ulong, void *, ulonglong);
static int arm_vtop(ulong, ulong *, physaddr_t *, int);
static int arm_kvtop(struct task_context *, ulong, physaddr_t *, int);
static int arm_uvtop(struct task_context *, ulong, physaddr_t *, int);
static int arm_get_frame(struct bt_info *, ulong *, ulong *);
static int arm_get_dumpfile_stack_frame(struct bt_info *, ulong *, ulong *);
static void arm_get_stack_frame(struct bt_info *, ulong *, ulong *);
static void arm_dump_exception_stack(ulong, ulong);
static void arm_display_full_frame(struct bt_info *, ulong);
static ulong arm_vmalloc_start(void);
static int arm_is_task_addr(ulong);
static int arm_dis_filter(ulong, char *, unsigned int);
static int arm_eframe_search(struct bt_info *);
static ulong arm_get_task_pgd(ulong);
static void arm_cmd_mach(void);
static void arm_display_machine_stats(void);
static int arm_get_smp_cpus(void);
static void arm_init_machspec(void);
static struct line_number_hook arm_line_number_hooks[];
static struct machine_specific arm_machine_specific;
/**
* struct arm_cpu_context_save - idle task registers
*
* This structure holds idle task registers. Only FP, SP, and PC are needed for
* unwinding the stack.
*/
struct arm_cpu_context_save {
ulong fp;
ulong sp;
ulong pc;
};
/*
* Holds registers during the crash.
*/
static struct arm_pt_regs *panic_task_regs;
#define PGDIR_SIZE() (4 * PAGESIZE())
#define PGDIR_OFFSET(X) (((ulong)(X)) & (PGDIR_SIZE() - 1))
#define _SECTION_PAGE_MASK (~((MEGABYTES(1))-1))
#define PMD_TYPE_MASK 3
#define PMD_TYPE_SECT 2
#define PMD_TYPE_TABLE 1
#define PMD_TYPE_SECT_LPAE 1
static inline ulong *
pmd_page_addr(ulong pmd)
{
ulong ptr;
if (machdep->flags & PGTABLE_V2) {
ptr = PAGEBASE(pmd);
} else {
ptr = pmd & ~(PTRS_PER_PTE * sizeof(void *) - 1);
ptr += PTRS_PER_PTE * sizeof(void *);
}
return (ulong *)ptr;
}
/*
* "Linux" PTE definitions.
*/
#define L_PTE_PRESENT (1 << 0)
#define L_PTE_YOUNG (1 << 1)
#define L_PTE_FILE (1 << 2)
#define L_PTE_DIRTY (1 << 6)
#define L_PTE_WRITE (1 << 7)
#define L_PTE_RDONLY L_PTE_WRITE
#define L_PTE_USER (1 << 8)
#define L_PTE_EXEC (1 << 9)
#define L_PTE_XN L_PTE_EXEC
#define L_PTE_SHARED (1 << 10)
#define pte_val(pte) (pte)
#define pte_present(pte) (pte_val(pte) & L_PTE_PRESENT)
#define pte_write(pte) (pte_val(pte) & L_PTE_WRITE)
#define pte_rdonly(pte) (pte_val(pte) & L_PTE_RDONLY)
#define pte_dirty(pte) (pte_val(pte) & L_PTE_DIRTY)
#define pte_young(pte) (pte_val(pte) & L_PTE_YOUNG)
#define pte_exec(pte) (pte_val(pte) & L_PTE_EXEC)
#define pte_xn(pte) (pte_val(pte) & L_PTE_XN)
/*
* Following stuff is taken directly from the kernel sources. These are used in
* dump_exception_stack() to format an exception stack entry.
*/
#define USR26_MODE 0x00000000
#define FIQ26_MODE 0x00000001
#define IRQ26_MODE 0x00000002
#define SVC26_MODE 0x00000003
#define USR_MODE 0x00000010
#define FIQ_MODE 0x00000011
#define IRQ_MODE 0x00000012
#define SVC_MODE 0x00000013
#define ABT_MODE 0x00000017
#define UND_MODE 0x0000001b
#define SYSTEM_MODE 0x0000001f
#define MODE32_BIT 0x00000010
#define MODE_MASK 0x0000001f
#define PSR_T_BIT 0x00000020
#define PSR_F_BIT 0x00000040
#define PSR_I_BIT 0x00000080
#define PSR_A_BIT 0x00000100
#define PSR_E_BIT 0x00000200
#define PSR_J_BIT 0x01000000
#define PSR_Q_BIT 0x08000000
#define PSR_V_BIT 0x10000000
#define PSR_C_BIT 0x20000000
#define PSR_Z_BIT 0x40000000
#define PSR_N_BIT 0x80000000
#define isa_mode(regs) \
((((regs)->ARM_cpsr & PSR_J_BIT) >> 23) | \
(((regs)->ARM_cpsr & PSR_T_BIT) >> 5))
#define processor_mode(regs) \
((regs)->ARM_cpsr & MODE_MASK)
#define interrupts_enabled(regs) \
(!((regs)->ARM_cpsr & PSR_I_BIT))
#define fast_interrupts_enabled(regs) \
(!((regs)->ARM_cpsr & PSR_F_BIT))
static const char *processor_modes[] = {
"USER_26", "FIQ_26", "IRQ_26", "SVC_26", "UK4_26", "UK5_26",
"UK6_26", "UK7_26" , "UK8_26", "UK9_26", "UK10_26", "UK11_26",
"UK12_26", "UK13_26", "UK14_26", "UK15_26", "USER_32", "FIQ_32",
"IRQ_32", "SVC_32", "UK4_32", "UK5_32", "UK6_32", "ABT_32",
"UK8_32", "UK9_32", "UK10_32", "UND_32", "UK12_32", "UK13_32",
"UK14_32", "SYS_32",
};
static const char *isa_modes[] = {
"ARM" , "Thumb" , "Jazelle", "ThumbEE",
};
#define NOT_IMPLEMENTED() \
error(FATAL, "%s: N/A\n", __func__)
/*
* Do all necessary machine-specific setup here. This is called several times
* during initialization.
*/
void
arm_init(int when)
{
ulong vaddr;
char *string;
struct syment *sp;
#if defined(__i386__) || defined(__x86_64__)
if (ACTIVE())
error(FATAL, "compiled for the ARM architecture\n");
#endif
switch (when) {
case PRE_SYMTAB:
machdep->verify_symbol = arm_verify_symbol;
machdep->machspec = &arm_machine_specific;
if (pc->flags & KERNEL_DEBUG_QUERY)
return;
machdep->pagesize = memory_page_size();
machdep->pageshift = ffs(machdep->pagesize) - 1;
machdep->pageoffset = machdep->pagesize - 1;
machdep->pagemask = ~((ulonglong)machdep->pageoffset);
machdep->stacksize = machdep->pagesize * 2;
machdep->last_pgd_read = 0;
machdep->last_pmd_read = 0;
machdep->last_ptbl_read = 0;
machdep->verify_paddr = generic_verify_paddr;
machdep->ptrs_per_pgd = PTRS_PER_PGD;
if (machdep->cmdline_args[0])
arm_parse_cmdline_args();
break;
case PRE_GDB:
if ((machdep->pgd = (char *)malloc(PGDIR_SIZE())) == NULL)
error(FATAL, "cannot malloc pgd space.");
if ((machdep->pmd = (char *)malloc(PMDSIZE())) == NULL)
error(FATAL, "cannot malloc pmd space.");
if ((machdep->ptbl = (char *)malloc(PAGESIZE())) == NULL)
error(FATAL, "cannot malloc ptbl space.");
/*
* LPAE requires an additional page for the PGD,
* so PG_DIR_SIZE = 0x5000 for LPAE
*/
if ((string = pc->read_vmcoreinfo("CONFIG_ARM_LPAE"))) {
machdep->flags |= PAE;
free(string);
} else if ((sp = next_symbol("swapper_pg_dir", NULL)) &&
(sp->value - symbol_value("swapper_pg_dir")) == 0x5000)
machdep->flags |= PAE;
machdep->kvbase = symbol_value("_stext") & ~KVBASE_MASK;
machdep->identity_map_base = machdep->kvbase;
machdep->is_kvaddr = arm_is_kvaddr;
machdep->is_uvaddr = arm_is_uvaddr;
machdep->eframe_search = arm_eframe_search;
machdep->back_trace = arm_back_trace_cmd;
machdep->processor_speed = arm_processor_speed;
machdep->uvtop = arm_uvtop;
machdep->kvtop = arm_kvtop;
machdep->get_task_pgd = arm_get_task_pgd;
machdep->get_stack_frame = arm_get_stack_frame;
machdep->get_stackbase = generic_get_stackbase;
machdep->get_stacktop = generic_get_stacktop;
machdep->translate_pte = arm_translate_pte;
machdep->memory_size = generic_memory_size;
machdep->vmalloc_start = arm_vmalloc_start;
machdep->is_task_addr = arm_is_task_addr;
machdep->dis_filter = arm_dis_filter;
machdep->cmd_mach = arm_cmd_mach;
machdep->get_smp_cpus = arm_get_smp_cpus;
machdep->line_number_hooks = arm_line_number_hooks;
machdep->value_to_symbol = generic_machdep_value_to_symbol;
machdep->init_kernel_pgd = NULL;
machdep->dump_irq = generic_dump_irq;
machdep->show_interrupts = generic_show_interrupts;
machdep->get_irq_affinity = generic_get_irq_affinity;
arm_init_machspec();
break;
case POST_GDB:
/*
* Starting from 2.6.38 hardware and Linux page tables
* were reordered. See also mainline kernel commit
* d30e45eeabe (ARM: pgtable: switch order of Linux vs
* hardware page tables).
*/
if (THIS_KERNEL_VERSION > LINUX(2,6,37) ||
STRUCT_EXISTS("pteval_t"))
machdep->flags |= PGTABLE_V2;
if (THIS_KERNEL_VERSION >= LINUX(3,3,0) ||
symbol_exists("idmap_pgd"))
machdep->flags |= IDMAP_PGD;
if (machdep->flags & PAE) {
machdep->section_size_bits = _SECTION_SIZE_BITS_LPAE;
machdep->max_physmem_bits = _MAX_PHYSMEM_BITS_LPAE;
} else {
machdep->section_size_bits = _SECTION_SIZE_BITS;
machdep->max_physmem_bits = _MAX_PHYSMEM_BITS;
}
if (symbol_exists("irq_desc"))
ARRAY_LENGTH_INIT(machdep->nr_irqs, irq_desc,
"irq_desc", NULL, 0);
else if (kernel_symbol_exists("nr_irqs"))
get_symbol_data("nr_irqs", sizeof(unsigned int),
&machdep->nr_irqs);
/*
* Registers for idle threads are saved in
* thread_info.cpu_context.
*/
STRUCT_SIZE_INIT(cpu_context_save, "cpu_context_save");
MEMBER_OFFSET_INIT(cpu_context_save_fp,
"cpu_context_save", "fp");
MEMBER_OFFSET_INIT(cpu_context_save_sp,
"cpu_context_save", "sp");
MEMBER_OFFSET_INIT(cpu_context_save_pc,
"cpu_context_save", "pc");
MEMBER_OFFSET_INIT(thread_info_cpu_context,
"thread_info", "cpu_context");
/*
* We need to have information about note_buf_t which is used to
* hold ELF note containing registers and status of the thread
* that panic'd.
*/
STRUCT_SIZE_INIT(note_buf, "note_buf_t");
STRUCT_SIZE_INIT(elf_prstatus, "elf_prstatus");
MEMBER_OFFSET_INIT(elf_prstatus_pr_pid, "elf_prstatus",
"pr_pid");
MEMBER_OFFSET_INIT(elf_prstatus_pr_reg, "elf_prstatus",
"pr_reg");
if (!machdep->hz)
machdep->hz = 100;
break;
case POST_VM:
machdep->machspec->vmalloc_start_addr = vt->high_memory;
/*
* Modules are placed in first vmalloc'd area. This is 16MB
* below PAGE_OFFSET.
*/
machdep->machspec->modules_end = machdep->kvbase - 1;
vaddr = first_vmalloc_address();
if (vaddr > machdep->machspec->modules_end)
machdep->machspec->modules_vaddr = DEFAULT_MODULES_VADDR;
else
machdep->machspec->modules_vaddr = vaddr;
/*
* crash_notes contains machine specific information about the
* crash. In particular, it contains CPU registers at the time
* of the crash. We need this information to extract correct
* backtraces from the panic task.
*/
if (!ACTIVE() && !arm_get_crash_notes())
error(WARNING,
"cannot retrieve registers for active task%s\n\n",
kt->cpus > 1 ? "s" : "");
if (init_unwind_tables()) {
if (CRASHDEBUG(1))
fprintf(fp, "using unwind tables\n");
} else {
if (CRASHDEBUG(1))
fprintf(fp, "using framepointers\n");
}
break;
case LOG_ONLY:
machdep->machspec = &arm_machine_specific;
machdep->kvbase = kt->vmcoreinfo._stext_SYMBOL & 0xffff0000UL;
arm_init_machspec();
break;
}
}
void
arm_dump_machdep_table(ulong arg)
{
const struct machine_specific *ms;
int others, i;
others = 0;
fprintf(fp, " flags: %lx (", machdep->flags);
if (machdep->flags & KSYMS_START)
fprintf(fp, "%sKSYMS_START", others++ ? "|" : "");
if (machdep->flags & PHYS_BASE)
fprintf(fp, "%sPHYS_BASE", others++ ? "|" : "");
if (machdep->flags & PGTABLE_V2)
fprintf(fp, "%sPGTABLE_V2", others++ ? "|" : "");
if (machdep->flags & IDMAP_PGD)
fprintf(fp, "%sIDMAP_PGD", others++ ? "|" : "");
if (machdep->flags & PAE)
fprintf(fp, "%sPAE", others++ ? "|" : "");
fprintf(fp, ")\n");
fprintf(fp, " kvbase: %lx\n", machdep->kvbase);
fprintf(fp, " identity_map_base: %lx\n", machdep->kvbase);
fprintf(fp, " pagesize: %d\n", machdep->pagesize);
fprintf(fp, " pageshift: %d\n", machdep->pageshift);
fprintf(fp, " pagemask: %lx\n", (ulong)machdep->pagemask);
fprintf(fp, " pageoffset: %lx\n", machdep->pageoffset);
fprintf(fp, " stacksize: %ld\n", machdep->stacksize);
fprintf(fp, " hz: %d\n", machdep->hz);
fprintf(fp, " mhz: %ld\n", machdep->mhz);
fprintf(fp, " memsize: %lld (0x%llx)\n",
machdep->memsize, machdep->memsize);
fprintf(fp, " bits: %d\n", machdep->bits);
fprintf(fp, " nr_irqs: %d\n", machdep->nr_irqs);
fprintf(fp, " eframe_search: arm_eframe_search()\n");
fprintf(fp, " back_trace: arm_back_trace_cmd()\n");
fprintf(fp, " processor_speed: arm_processor_speed()\n");
fprintf(fp, " uvtop: arm_uvtop()\n");
fprintf(fp, " kvtop: arm_kvtop()\n");
fprintf(fp, " get_task_pgd: arm_get_task_pgd()\n");
fprintf(fp, " dump_irq: generic_dump_irq()\n");
fprintf(fp, " get_stack_frame: arm_get_stack_frame()\n");
fprintf(fp, " get_stackbase: generic_get_stackbase()\n");
fprintf(fp, " get_stacktop: generic_get_stacktop()\n");
fprintf(fp, " translate_pte: arm_translate_pte()\n");
fprintf(fp, " memory_size: generic_memory_size()\n");
fprintf(fp, " vmalloc_start: arm_vmalloc_start()\n");
fprintf(fp, " is_task_addr: arm_is_task_addr()\n");
fprintf(fp, " verify_symbol: arm_verify_symbol()\n");
fprintf(fp, " dis_filter: arm_dis_filter()\n");
fprintf(fp, " cmd_mach: arm_cmd_mach()\n");
fprintf(fp, " get_smp_cpus: arm_get_smp_cpus()\n");
fprintf(fp, " is_kvaddr: arm_is_kvaddr()\n");
fprintf(fp, " is_uvaddr: arm_is_uvaddr()\n");
fprintf(fp, " verify_paddr: generic_verify_paddr()\n");
fprintf(fp, " show_interrupts: generic_show_interrupts()\n");
fprintf(fp, " get_irq_affinity: generic_get_irq_affinity()\n");
fprintf(fp, " xendump_p2m_create: NULL\n");
fprintf(fp, "xen_kdump_p2m_create: NULL\n");
fprintf(fp, " line_number_hooks: arm_line_number_hooks\n");
fprintf(fp, " last_pgd_read: %lx\n", machdep->last_pgd_read);
fprintf(fp, " last_pmd_read: %lx\n", machdep->last_pmd_read);
fprintf(fp, " last_ptbl_read: %lx\n", machdep->last_ptbl_read);
fprintf(fp, "clear_machdep_cache: NULL\n");
fprintf(fp, " pgd: %lx\n", (ulong)machdep->pgd);
fprintf(fp, " pmd: %lx\n", (ulong)machdep->pmd);
fprintf(fp, " ptbl: %lx\n", (ulong)machdep->ptbl);
fprintf(fp, " ptrs_per_pgd: %d\n", machdep->ptrs_per_pgd);
fprintf(fp, " section_size_bits: %ld\n", machdep->section_size_bits);
fprintf(fp, " max_physmem_bits: %ld\n", machdep->max_physmem_bits);
fprintf(fp, " sections_per_root: %ld\n", machdep->sections_per_root);
for (i = 0; i < MAX_MACHDEP_ARGS; i++) {
fprintf(fp, " cmdline_args[%d]: %s\n",
i, machdep->cmdline_args[i] ?
machdep->cmdline_args[i] : "(unused)");
}
ms = machdep->machspec;
fprintf(fp, " machspec: %lx\n", (ulong)ms);
fprintf(fp, " phys_base: %lx\n", ms->phys_base);
fprintf(fp, " vmalloc_start_addr: %lx\n", ms->vmalloc_start_addr);
fprintf(fp, " modules_vaddr: %lx\n", ms->modules_vaddr);
fprintf(fp, " modules_end: %lx\n", ms->modules_end);
fprintf(fp, " kernel_text_start: %lx\n", ms->kernel_text_start);
fprintf(fp, " kernel_text_end: %lx\n", ms->kernel_text_end);
fprintf(fp, "exception_text_start: %lx\n", ms->exception_text_start);
fprintf(fp, " exception_text_end: %lx\n", ms->exception_text_end);
fprintf(fp, " crash_task_regs: %lx\n", (ulong)ms->crash_task_regs);
fprintf(fp, "unwind_index_prel31: %d\n", ms->unwind_index_prel31);
}
/*
* Parse machine dependent command line arguments.
*
* Force the phys_base address via:
*
* --machdep phys_base=<address>
*/
static void
arm_parse_cmdline_args(void)
{
int index, i, c, err;
char *arglist[MAXARGS];
char buf[BUFSIZE];
char *p;
ulong value = 0;
for (index = 0; index < MAX_MACHDEP_ARGS; index++) {
if (!machdep->cmdline_args[index])
break;
if (!strstr(machdep->cmdline_args[index], "=")) {
error(WARNING, "ignoring --machdep option: %x\n",
machdep->cmdline_args[index]);
continue;
}
strcpy(buf, machdep->cmdline_args[index]);
for (p = buf; *p; p++) {
if (*p == ',')
*p = ' ';
}
c = parse_line(buf, arglist);
for (i = 0; i < c; i++) {
err = 0;
if (STRNEQ(arglist[i], "phys_base=")) {
int megabytes = FALSE;
int flags = RETURN_ON_ERROR | QUIET;
if ((LASTCHAR(arglist[i]) == 'm') ||
(LASTCHAR(arglist[i]) == 'M')) {
LASTCHAR(arglist[i]) = NULLCHAR;
megabytes = TRUE;
}
p = arglist[i] + strlen("phys_base=");
if (strlen(p)) {
if (megabytes)
value = dtol(p, flags, &err);
else
value = htol(p, flags, &err);
}
if (!err) {
if (megabytes)
value = MEGABYTES(value);
machdep->machspec->phys_base = value;
error(NOTE,
"setting phys_base to: 0x%lx\n",
machdep->machspec->phys_base);
machdep->flags |= PHYS_BASE;
continue;
}
}
error(WARNING, "ignoring --machdep option: %s\n",
arglist[i]);
}
}
}
/*
* Retrieve task registers for the time of the crash.
*/
static int
arm_get_crash_notes(void)
{
struct machine_specific *ms = machdep->machspec;
ulong crash_notes;
Elf32_Nhdr *note;
ulong offset;
char *buf, *p;
ulong *notes_ptrs;
ulong i;
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, "failed to read note_buf_t\n");
goto fail;
}
/*
* Do some sanity checks for this note before reading registers from it.
*/
note = (Elf32_Nhdr *)buf;
p = buf + sizeof(Elf32_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(Elf32_Nhdr);
if (sizeof(Elf32_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;
}
}
if (note->n_type != NT_PRSTATUS) {
error(WARNING, "invalid note (n_type != NT_PRSTATUS)\n");
goto fail;
}
if (p[0] != 'C' || p[1] != 'O' || p[2] != 'R' || p[3] != 'E') {
error(WARNING, "invalid 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(Elf32_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);
free(panic_task_regs);
return FALSE;
}
/*
* Accept or reject a symbol from the kernel namelist.
*/
static int
arm_verify_symbol(const char *name, ulong value, char type)
{
if (STREQ(name, "swapper_pg_dir"))
machdep->flags |= KSYMS_START;
if (!name || !strlen(name) || !(machdep->flags & KSYMS_START))
return FALSE;
if (STREQ(name, "$a") || STREQ(name, "$n") || STREQ(name, "$d"))
return FALSE;
if (STREQ(name, "PRRR") || STREQ(name, "NMRR"))
return FALSE;
if ((type == 'A') && STRNEQ(name, "__crc_"))
return FALSE;
if (CRASHDEBUG(8) && name && strlen(name))
fprintf(fp, "%08lx %s\n", value, name);
return TRUE;
}
static int
arm_is_module_addr(ulong vaddr)
{
ulong modules_start;
ulong modules_end = machdep->machspec->modules_end;
if (!MODULES_VADDR) {
/*
* In case we are still initializing, and vm_init() has not been
* called, we use defaults here which is 16MB below kernel start
* address.
*/
modules_start = DEFAULT_MODULES_VADDR;
} else {
modules_start = MODULES_VADDR;
}
return (vaddr >= modules_start && vaddr <= modules_end);
}
int
arm_is_vmalloc_addr(ulong vaddr)
{
if (arm_is_module_addr(vaddr))
return TRUE;
if (!VMALLOC_START)
return FALSE;
return (vaddr >= VMALLOC_START);
}
/*
* Check whether given address falls inside kernel address space (including
* modules).
*/
static int
arm_is_kvaddr(ulong vaddr)
{
if (arm_is_module_addr(vaddr))
return TRUE;
return (vaddr >= machdep->kvbase);
}
static int
arm_is_uvaddr(ulong vaddr, struct task_context *unused)
{
if (arm_is_module_addr(vaddr))
return FALSE;
return (vaddr < machdep->kvbase);
}
/*
* Returns TRUE if given pc is in exception area.
*/
static int
arm_in_exception_text(ulong pc)
{
ulong exception_start = machdep->machspec->exception_text_start;
ulong exception_end = machdep->machspec->exception_text_end;
if (exception_start && exception_end)
return (pc >= exception_start && pc < exception_end);
return FALSE;
}
/*
* Returns TRUE if given pc points to a return from syscall
* entrypoint. In case the function returns TRUE and if offset is given,
* it is filled with the offset that should be added to the SP to get
* address of the exception frame where the user registers are.
*/
static int
arm_in_ret_from_syscall(ulong pc, int *offset)
{
/*
* On fast syscall return path, the stack looks like:
*
* SP + 0 {r4, r5}
* SP + 8 user pt_regs
*
* The asm syscall handler pushes fifth and sixth registers
* onto the stack before calling the actual syscall handler.
*
* So in order to print out the user registers at the time
* the syscall was made, we need to adjust SP for 8.
*/
if (pc == symbol_value("ret_fast_syscall")) {
if (offset)
*offset = 8;
return TRUE;
}
/*
* In case we are on the slow syscall path, the SP already
* points to the start of the user registers hence no
* adjustments needs to be done.
*/
if (pc == symbol_value("ret_slow_syscall")) {
if (offset)
*offset = 0;
return TRUE;
}
return FALSE;
}
/*
* Unroll the kernel stack using a minimal amount of gdb services.
*/
static void
arm_back_trace(struct bt_info *bt)
{
int n = 0;
/*
* In case bt->machdep contains pointer to a full register set, we take
* FP from there.
*/
if (bt->machdep) {
const struct arm_pt_regs *regs = bt->machdep;
bt->frameptr = regs->ARM_fp;
}
/*
* Stack frame layout:
* optionally saved caller registers (r4 - r10)
* saved fp
* saved sp
* saved lr
* frame => saved pc
* optionally saved arguments (r0 - r3)
* saved sp => <next word>
*
* Functions start with the following code sequence:
* mov ip, sp
* stmfd sp!, {r0 - r3} (optional)
* corrected pc => stmfd sp!, {..., fp, ip, lr, pc}
*/
while (bt->frameptr && INSTACK(bt->frameptr, bt)) {
ulong from;
ulong sp;
/*
* We correct the PC to point to the actual instruction (current
* value is PC + 8).
*/
bt->instptr = GET_STACK_ULONG(bt->frameptr - 0);
bt->instptr -= 8;
/*
* Now get LR, saved SP and FP from the frame as well.
*/
from = GET_STACK_ULONG(bt->frameptr - 4);
sp = GET_STACK_ULONG(bt->frameptr - 8);
bt->frameptr = GET_STACK_ULONG(bt->frameptr - 12);
arm_dump_backtrace_entry(bt, n++, from, sp);
bt->stkptr = sp;
}
}
/*
* Unroll a kernel stack.
*/
static void
arm_back_trace_cmd(struct bt_info *bt)
{
if (bt->flags & BT_REGS_NOT_FOUND)
return;
if (kt->flags & DWARF_UNWIND)
unwind_backtrace(bt);
else
arm_back_trace(bt);
}
/*
* Calculate and return the speed of the processor.
*/
static ulong
arm_processor_speed(void)
{
/*
* For now, we don't support reading CPU speed.
*/
return 0;
}
/*
* Translate a PTE, returning TRUE if the page is present. If a physaddr pointer
* is passed in, don't print anything.
*/
static int
arm_translate_pte(ulong pte, void *physaddr, ulonglong lpae_pte)
{
char ptebuf[BUFSIZE];
char physbuf[BUFSIZE];
char buf[BUFSIZE];
int page_present;
ulonglong paddr;
int len1, len2, others;
if (machdep->flags & PAE) {
paddr = LPAE_PAGEBASE(lpae_pte);
sprintf(ptebuf, "%llx", lpae_pte);
pte = (ulong)lpae_pte;
} else {
paddr = PAGEBASE(pte);
sprintf(ptebuf, "%lx", pte);
}
page_present = pte_present(pte);
if (physaddr) {
if (machdep->flags & PAE)
*((ulonglong *)physaddr) = paddr;
else
*((ulong *)physaddr) = (ulong)paddr;
return page_present;
}
len1 = MAX(strlen(ptebuf), strlen("PTE"));
fprintf(fp, "%s ", mkstring(buf, len1, CENTER | LJUST, "PTE"));
if (!page_present && pte) {
/* swap page, not handled yet */
return page_present;
}
sprintf(physbuf, "%llx", 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;
if (pte) {
if (pte_present(pte))
fprintf(fp, "%sPRESENT", others++ ? "|" : "");
if (pte_dirty(pte))
fprintf(fp, "%sDIRTY", others++ ? "|" : "");
if (pte_young(pte))
fprintf(fp, "%sYOUNG", others++ ? "|" : "");
if (machdep->flags & PGTABLE_V2) {
if (!pte_rdonly(pte))
fprintf(fp, "%sWRITE", others++ ? "|" : "");
if (!pte_xn(pte))
fprintf(fp, "%sEXEC", others++ ? "|" : "");
} else {
if (pte_write(pte))
fprintf(fp, "%sWRITE", others++ ? "|" : "");
if (pte_exec(pte))
fprintf(fp, "%sEXEC", others++ ? "|" : "");
}
} else {
fprintf(fp, "no mapping");
}
fprintf(fp, ")\n");
return 0;
}
/*
* Virtual to physical memory translation. This function will be called by both
* arm_kvtop() and arm_uvtop().
*/
static int
arm_vtop(ulong vaddr, ulong *pgd, physaddr_t *paddr, int verbose)
{
char buf[BUFSIZE];
ulong *page_dir;
ulong *page_middle;
ulong *page_table;
ulong pgd_pte;
ulong pmd_pte;
ulong pte;
/*
* Page tables in ARM Linux
*
* In hardware PGD is 16k (having 4096 pointers to PTE) and PTE is 1k
* (containing 256 translations).
*
* Linux, however, wants to have PTEs as page sized entities. This means
* that in ARM Linux we have following setup (see also
* arch/arm/include/asm/pgtable.h)
*
* Before 2.6.38
*
* PGD PTE
* +---------+
* | | 0 ----> +------------+
* +- - - - -+ | h/w pt 0 |
* | | 4 ----> +------------+ +1024
* +- - - - -+ | h/w pt 1 |
* . . +------------+ +2048
* . . | Linux pt 0 |
* . . +------------+ +3072
* | | 4095 | Linux pt 1 |