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arm64.c
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/*
* arm64.c - core analysis suite
*
* Copyright (C) 2012-2017 David Anderson
* Copyright (C) 2012-2017 Red Hat, Inc. 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 ARM64
#include "defs.h"
#include <elf.h>
#include <endian.h>
#include <sys/ioctl.h>
#define NOT_IMPLEMENTED(X) error((X), "%s: function not implemented\n", __func__)
static struct machine_specific arm64_machine_specific = { 0 };
static int arm64_verify_symbol(const char *, ulong, char);
static void arm64_parse_cmdline_args(void);
static void arm64_calc_kimage_voffset(void);
static void arm64_calc_phys_offset(void);
static void arm64_calc_virtual_memory_ranges(void);
static int arm64_kdump_phys_base(ulong *);
static ulong arm64_processor_speed(void);
static void arm64_init_kernel_pgd(void);
static int arm64_kvtop(struct task_context *, ulong, physaddr_t *, int);
static int arm64_uvtop(struct task_context *, ulong, physaddr_t *, int);
static int arm64_vtop_2level_64k(ulong, ulong, physaddr_t *, int);
static int arm64_vtop_3level_64k(ulong, ulong, physaddr_t *, int);
static int arm64_vtop_3level_4k(ulong, ulong, physaddr_t *, int);
static int arm64_vtop_4level_4k(ulong, ulong, physaddr_t *, int);
static ulong arm64_get_task_pgd(ulong);
static void arm64_irq_stack_init(void);
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_back_trace_cmd_v2(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 int arm64_print_stackframe_entry_v2(struct bt_info *, int, struct arm64_stackframe *, FILE *);
static void arm64_display_full_frame(struct bt_info *, ulong);
static void arm64_display_full_frame_v2(struct bt_info *, struct arm64_stackframe *, struct arm64_stackframe *);
static int arm64_unwind_frame(struct bt_info *, struct arm64_stackframe *);
static int arm64_unwind_frame_v2(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);
static ulong arm64_vmalloc_start(void);
static int arm64_is_task_addr(ulong);
static int arm64_dis_filter(ulong, char *, unsigned int);
static void arm64_cmd_mach(void);
static void arm64_display_machine_stats(void);
static int arm64_get_smp_cpus(void);
static void arm64_clear_machdep_cache(void);
static int arm64_on_process_stack(struct bt_info *, ulong);
static int arm64_in_alternate_stack(int, ulong);
static int arm64_on_irq_stack(int, ulong);
static void arm64_set_irq_stack(struct bt_info *);
static void arm64_set_process_stack(struct bt_info *);
static int arm64_get_kvaddr_ranges(struct vaddr_range *);
static int arm64_get_crash_notes(void);
static void arm64_calc_VA_BITS(void);
static int arm64_is_uvaddr(ulong, struct task_context *);
/*
* Do all necessary machine-specific setup here. This is called several times
* during initialization.
*/
void
arm64_init(int when)
{
ulong value;
char *string;
struct machine_specific *ms;
#if defined(__x86_64__)
if (ACTIVE())
error(FATAL, "compiled for the ARM64 architecture\n");
#endif
switch (when) {
case SETUP_ENV:
machdep->process_elf_notes = process_elf64_notes;
break;
case PRE_SYMTAB:
machdep->machspec = &arm64_machine_specific;
machdep->verify_symbol = arm64_verify_symbol;
if (pc->flags & KERNEL_DEBUG_QUERY)
return;
machdep->verify_paddr = generic_verify_paddr;
if (machdep->cmdline_args[0])
arm64_parse_cmdline_args();
machdep->flags |= MACHDEP_BT_TEXT;
ms = machdep->machspec;
if (!ms->kimage_voffset && STREQ(pc->live_memsrc, "/dev/crash"))
ioctl(pc->mfd, DEV_CRASH_ARCH_DATA, &ms->kimage_voffset);
if (!ms->kimage_voffset &&
(string = pc->read_vmcoreinfo("NUMBER(kimage_voffset)"))) {
ms->kimage_voffset = htol(string, QUIET, NULL);
free(string);
}
if (ms->kimage_voffset) {
machdep->flags |= NEW_VMEMMAP;
/*
* Even if CONFIG_RANDOMIZE_BASE is not configured,
* derive_kaslr_offset() should work and set
* kt->relocate to 0
*/
if (!kt->relocate && !(kt->flags2 & (RELOC_AUTO|KASLR)))
kt->flags2 |= (RELOC_AUTO|KASLR);
}
break;
case PRE_GDB:
if (kernel_symbol_exists("kimage_voffset"))
machdep->flags |= NEW_VMEMMAP;
if (!machdep->pagesize) {
/*
* Kerneldoc Documentation/arm64/booting.txt describes
* the kernel image header flags field.
*/
value = machdep->machspec->kernel_flags;
value = (value >> 1) & 3;
switch(value)
{
case 0:
break;
case 1:
machdep->pagesize = 4096;
break;
case 2:
/* TODO: machdep->pagesize = 16384; */
error(FATAL, "16K pages not supported.");
break;
case 3:
machdep->pagesize = 65536;
break;
}
}
if (!machdep->pagesize &&
kernel_symbol_exists("swapper_pg_dir") &&
kernel_symbol_exists("idmap_pg_dir")) {
value = symbol_value("swapper_pg_dir") -
symbol_value("idmap_pg_dir");
/*
* idmap_pg_dir is 2 pages prior to 4.1,
* and 3 pages thereafter. Only 4K and 64K
* page sizes are supported.
*/
switch (value)
{
case (4096 * 2):
case (4096 * 3):
machdep->pagesize = 4096;
break;
case (65536 * 2):
case (65536 * 3):
machdep->pagesize = 65536;
break;
}
} else if (ACTIVE())
machdep->pagesize = memory_page_size(); /* host */
machdep->pageshift = ffs(machdep->pagesize) - 1;
machdep->pageoffset = machdep->pagesize - 1;
machdep->pagemask = ~((ulonglong)machdep->pageoffset);
arm64_calc_VA_BITS();
ms = machdep->machspec;
ms->page_offset = ARM64_PAGE_OFFSET;
machdep->identity_map_base = ARM64_PAGE_OFFSET;
machdep->kvbase = ARM64_VA_START;
ms->userspace_top = ARM64_USERSPACE_TOP;
if (machdep->flags & NEW_VMEMMAP) {
struct syment *sp;
sp = kernel_symbol_search("_text");
ms->kimage_text = (sp ? sp->value : 0);
sp = kernel_symbol_search("_end");
ms->kimage_end = (sp ? sp->value : 0);
ms->modules_vaddr = ARM64_VA_START;
if (kernel_symbol_exists("kasan_init"))
ms->modules_vaddr += ARM64_KASAN_SHADOW_SIZE;
ms->modules_end = ms->modules_vaddr
+ ARM64_MODULES_VSIZE -1;
ms->vmalloc_start_addr = ms->modules_end + 1;
arm64_calc_kimage_voffset();
} else {
ms->modules_vaddr = ARM64_PAGE_OFFSET - MEGABYTES(64);
ms->modules_end = ARM64_PAGE_OFFSET - 1;
ms->vmalloc_start_addr = ARM64_VA_START;
}
ms->vmalloc_end = ARM64_VMALLOC_END;
ms->vmemmap_vaddr = ARM64_VMEMMAP_VADDR;
ms->vmemmap_end = ARM64_VMEMMAP_END;
switch (machdep->pagesize)
{
case 4096:
machdep->ptrs_per_pgd = PTRS_PER_PGD_L3_4K;
if ((machdep->pgd =
(char *)malloc(PTRS_PER_PGD_L3_4K * 8)) == NULL)
error(FATAL, "cannot malloc pgd space.");
if (machdep->machspec->VA_BITS > PGDIR_SHIFT_L4_4K) {
machdep->flags |= VM_L4_4K;
if ((machdep->pud =
(char *)malloc(PTRS_PER_PUD_L4_4K * 8))
== NULL)
error(FATAL, "cannot malloc pud space.");
} else {
machdep->flags |= VM_L3_4K;
machdep->pud = NULL; /* not used */
}
if ((machdep->pmd =
(char *)malloc(PTRS_PER_PMD_L3_4K * 8)) == NULL)
error(FATAL, "cannot malloc pmd space.");
if ((machdep->ptbl =
(char *)malloc(PTRS_PER_PTE_L3_4K * 8)) == NULL)
error(FATAL, "cannot malloc ptbl space.");
break;
case 65536:
if (machdep->machspec->VA_BITS > PGDIR_SHIFT_L3_64K) {
machdep->flags |= VM_L3_64K;
machdep->ptrs_per_pgd = PTRS_PER_PGD_L3_64K;
if ((machdep->pgd =
(char *)malloc(PTRS_PER_PGD_L3_64K * 8)) == NULL)
error(FATAL, "cannot malloc pgd space.");
if ((machdep->pmd =
(char *)malloc(PTRS_PER_PMD_L3_64K * 8)) == NULL)
error(FATAL, "cannot malloc pmd space.");
if ((machdep->ptbl =
(char *)malloc(PTRS_PER_PTE_L3_64K * 8)) == NULL)
error(FATAL, "cannot malloc ptbl space.");
} else {
machdep->flags |= VM_L2_64K;
machdep->ptrs_per_pgd = PTRS_PER_PGD_L2_64K;
if ((machdep->pgd =
(char *)malloc(PTRS_PER_PGD_L2_64K * 8)) == NULL)
error(FATAL, "cannot malloc pgd space.");
if ((machdep->ptbl =
(char *)malloc(PTRS_PER_PTE_L2_64K * 8)) == NULL)
error(FATAL, "cannot malloc ptbl space.");
machdep->pmd = NULL; /* not used */
}
machdep->pud = NULL; /* not used */
break;
default:
if (machdep->pagesize)
error(FATAL, "invalid/unsupported page size: %d\n",
machdep->pagesize);
else
error(FATAL, "cannot determine page size\n");
}
machdep->last_pgd_read = 0;
machdep->last_pud_read = 0;
machdep->last_pmd_read = 0;
machdep->last_ptbl_read = 0;
machdep->clear_machdep_cache = arm64_clear_machdep_cache;
machdep->stacksize = ARM64_STACK_SIZE;
machdep->flags |= VMEMMAP;
machdep->uvtop = arm64_uvtop;
machdep->kvtop = arm64_kvtop;
machdep->is_kvaddr = generic_is_kvaddr;
machdep->is_uvaddr = arm64_is_uvaddr;
machdep->eframe_search = arm64_eframe_search;
machdep->back_trace = arm64_back_trace_cmd;
machdep->in_alternate_stack = arm64_in_alternate_stack;
machdep->processor_speed = arm64_processor_speed;
machdep->get_task_pgd = arm64_get_task_pgd;
machdep->get_stack_frame = arm64_get_stack_frame;
machdep->get_stackbase = generic_get_stackbase;
machdep->get_stacktop = generic_get_stacktop;
machdep->translate_pte = arm64_translate_pte;
machdep->memory_size = generic_memory_size;
machdep->vmalloc_start = arm64_vmalloc_start;
machdep->get_kvaddr_ranges = arm64_get_kvaddr_ranges;
machdep->is_task_addr = arm64_is_task_addr;
machdep->dis_filter = arm64_dis_filter;
machdep->cmd_mach = arm64_cmd_mach;
machdep->get_smp_cpus = arm64_get_smp_cpus;
machdep->line_number_hooks = NULL;
machdep->value_to_symbol = generic_machdep_value_to_symbol;
machdep->dump_irq = generic_dump_irq;
machdep->show_interrupts = generic_show_interrupts;
machdep->get_irq_affinity = generic_get_irq_affinity;
machdep->dumpfile_init = NULL;
machdep->verify_line_number = NULL;
machdep->init_kernel_pgd = arm64_init_kernel_pgd;
/* use machdep parameters */
arm64_calc_phys_offset();
if (CRASHDEBUG(1)) {
if (machdep->flags & NEW_VMEMMAP)
fprintf(fp, "kimage_voffset: %lx\n",
machdep->machspec->kimage_voffset);
fprintf(fp, "phys_offset: %lx\n",
machdep->machspec->phys_offset);
}
break;
case POST_GDB:
arm64_calc_virtual_memory_ranges();
machdep->section_size_bits = _SECTION_SIZE_BITS;
if (THIS_KERNEL_VERSION >= LINUX(3,17,0))
machdep->max_physmem_bits = _MAX_PHYSMEM_BITS_3_17;
else
machdep->max_physmem_bits = _MAX_PHYSMEM_BITS;
ms = machdep->machspec;
if (THIS_KERNEL_VERSION >= LINUX(4,0,0)) {
ms->__SWP_TYPE_BITS = 6;
ms->__SWP_TYPE_SHIFT = 2;
ms->__SWP_TYPE_MASK = ((1UL << ms->__SWP_TYPE_BITS) - 1);
ms->__SWP_OFFSET_SHIFT = (ms->__SWP_TYPE_BITS + ms->__SWP_TYPE_SHIFT);
ms->__SWP_OFFSET_BITS = 50;
ms->__SWP_OFFSET_MASK = ((1UL << ms->__SWP_OFFSET_BITS) - 1);
ms->PTE_PROT_NONE = (1UL << 58);
ms->PTE_FILE = 0; /* unused */
} else if (THIS_KERNEL_VERSION >= LINUX(3,13,0)) {
ms->__SWP_TYPE_BITS = 6;
ms->__SWP_TYPE_SHIFT = 3;
ms->__SWP_TYPE_MASK = ((1UL << ms->__SWP_TYPE_BITS) - 1);
ms->__SWP_OFFSET_SHIFT = (ms->__SWP_TYPE_BITS + ms->__SWP_TYPE_SHIFT);
ms->__SWP_OFFSET_BITS = 49;
ms->__SWP_OFFSET_MASK = ((1UL << ms->__SWP_OFFSET_BITS) - 1);
ms->PTE_PROT_NONE = (1UL << 58);
ms->PTE_FILE = (1UL << 2);
} else if (THIS_KERNEL_VERSION >= LINUX(3,11,0)) {
ms->__SWP_TYPE_BITS = 6;
ms->__SWP_TYPE_SHIFT = 4;
ms->__SWP_TYPE_MASK = ((1UL << ms->__SWP_TYPE_BITS) - 1);
ms->__SWP_OFFSET_SHIFT = (ms->__SWP_TYPE_BITS + ms->__SWP_TYPE_SHIFT);
ms->__SWP_OFFSET_BITS = 0; /* unused */
ms->__SWP_OFFSET_MASK = 0; /* unused */
ms->PTE_PROT_NONE = (1UL << 2);
ms->PTE_FILE = (1UL << 3);
} else {
ms->__SWP_TYPE_BITS = 6;
ms->__SWP_TYPE_SHIFT = 3;
ms->__SWP_TYPE_MASK = ((1UL << ms->__SWP_TYPE_BITS) - 1);
ms->__SWP_OFFSET_SHIFT = (ms->__SWP_TYPE_BITS + ms->__SWP_TYPE_SHIFT);
ms->__SWP_OFFSET_BITS = 0; /* unused */
ms->__SWP_OFFSET_MASK = 0; /* unused */
ms->PTE_PROT_NONE = (1UL << 1);
ms->PTE_FILE = (1UL << 2);
}
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);
if (!machdep->hz)
machdep->hz = 100;
arm64_irq_stack_init();
arm64_stackframe_init();
break;
case POST_VM:
/*
* 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 (!LIVE() && !arm64_get_crash_notes())
error(WARNING,
"cannot retrieve registers for active task%s\n\n",
kt->cpus > 1 ? "s" : "");
break;
case LOG_ONLY:
machdep->machspec = &arm64_machine_specific;
arm64_calc_VA_BITS();
arm64_calc_phys_offset();
machdep->machspec->page_offset = ARM64_PAGE_OFFSET;
break;
}
}
/*
* Accept or reject a symbol from the kernel namelist.
*/
static int
arm64_verify_symbol(const char *name, ulong value, char type)
{
if (!name || !strlen(name))
return FALSE;
if ((type == 'A') && STREQ(name, "_kernel_flags_le"))
machdep->machspec->kernel_flags = le64toh(value);
if (((type == 'A') || (type == 'a')) && (highest_bit_long(value) != 63))
return FALSE;
if ((value == 0) &&
((type == 'a') || (type == 'n') || (type == 'N') || (type == 'U')))
return FALSE;
if (STREQ(name, "$d") || STREQ(name, "$x"))
return FALSE;
if ((type == 'A') && STRNEQ(name, "__crc_"))
return FALSE;
if ((type == 'N') && strstr(name, "$d"))
return FALSE;
if (!(machdep->flags & KSYMS_START) && STREQ(name, "idmap_pg_dir"))
machdep->flags |= KSYMS_START;
return TRUE;
}
void
arm64_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_OFFSET)
fprintf(fp, "%sPHYS_OFFSET", others++ ? "|" : "");
if (machdep->flags & VM_L2_64K)
fprintf(fp, "%sVM_L2_64K", others++ ? "|" : "");
if (machdep->flags & VM_L3_64K)
fprintf(fp, "%sVM_L3_64K", others++ ? "|" : "");
if (machdep->flags & VM_L3_4K)
fprintf(fp, "%sVM_L3_4K", others++ ? "|" : "");
if (machdep->flags & VM_L4_4K)
fprintf(fp, "%sVM_L4_4K", others++ ? "|" : "");
if (machdep->flags & VMEMMAP)
fprintf(fp, "%sVMEMMAP", others++ ? "|" : "");
if (machdep->flags & KDUMP_ENABLED)
fprintf(fp, "%sKDUMP_ENABLED", others++ ? "|" : "");
if (machdep->flags & IRQ_STACKS)
fprintf(fp, "%sIRQ_STACKS", others++ ? "|" : "");
if (machdep->flags & UNW_4_14)
fprintf(fp, "%sUNW_4_14", others++ ? "|" : "");
if (machdep->flags & MACHDEP_BT_TEXT)
fprintf(fp, "%sMACHDEP_BT_TEXT", others++ ? "|" : "");
if (machdep->flags & NEW_VMEMMAP)
fprintf(fp, "%sNEW_VMEMMAP", others++ ? "|" : "");
fprintf(fp, ")\n");
fprintf(fp, " kvbase: %lx\n", machdep->kvbase);
fprintf(fp, " identity_map_base: %lx\n", machdep->identity_map_base);
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",
(ulonglong)machdep->memsize, (ulonglong)machdep->memsize);
fprintf(fp, " bits: %d\n", machdep->bits);
fprintf(fp, " nr_irqs: %d\n", machdep->nr_irqs);
fprintf(fp, " eframe_search: arm64_eframe_search()\n");
fprintf(fp, " back_trace: arm64_back_trace_cmd() (default: %s method)\n",
kt->flags & USE_OPT_BT ? "optional" : "original");
fprintf(fp, " in_alternate_stack: arm64_in_alternate_stack()\n");
fprintf(fp, " processor_speed: arm64_processor_speed()\n");
fprintf(fp, " uvtop: arm64_uvtop()->%s()\n",
machdep->flags & VM_L3_4K ?
"arm64_vtop_3level_4k" :
machdep->flags & VM_L4_4K ?
"arm64_vtop_4level_4k" :
machdep->flags & VM_L3_64K ?
"arm64_vtop_3level_64k" : "arm64_vtop_2level_64k");
fprintf(fp, " kvtop: arm64_kvtop()->%s()\n",
machdep->flags & VM_L3_4K ?
"arm64_vtop_3level_4k" :
machdep->flags & VM_L4_4K ?
"arm64_vtop_4level_4k" :
machdep->flags & VM_L3_64K ?
"arm64_vtop_3level_64k" : "arm64_vtop_2level_64k");
fprintf(fp, " get_task_pgd: arm64_get_task_pgd()\n");
fprintf(fp, " dump_irq: generic_dump_irq()\n");
fprintf(fp, " get_stack_frame: arm64_get_stack_frame()\n");
fprintf(fp, " get_stackbase: generic_get_stackbase()\n");
fprintf(fp, " get_stacktop: generic_get_stacktop()\n");
fprintf(fp, " translate_pte: arm64_translate_pte()\n");
fprintf(fp, " memory_size: generic_memory_size()\n");
fprintf(fp, " vmalloc_start: arm64_vmalloc_start()\n");
fprintf(fp, " get_kvaddr_ranges: arm64_get_kvaddr_ranges()\n");
fprintf(fp, " is_task_addr: arm64_is_task_addr()\n");
fprintf(fp, " verify_symbol: arm64_verify_symbol()\n");
fprintf(fp, " dis_filter: arm64_dis_filter()\n");
fprintf(fp, " cmd_mach: arm64_cmd_mach()\n");
fprintf(fp, " get_smp_cpus: arm64_get_smp_cpus()\n");
fprintf(fp, " is_kvaddr: generic_is_kvaddr()\n");
fprintf(fp, " is_uvaddr: arm64_is_uvaddr()\n");
fprintf(fp, " value_to_symbol: generic_machdep_value_to_symbol()\n");
fprintf(fp, " init_kernel_pgd: arm64_init_kernel_pgd\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, " dumpfile_init: (not used)\n");
fprintf(fp, " process_elf_notes: process_elf64_notes()\n");
fprintf(fp, " verify_line_number: (not used)\n");
fprintf(fp, " xendump_p2m_create: (n/a)\n");
fprintf(fp, "xen_kdump_p2m_create: (n/a)\n");
fprintf(fp, " xendump_panic_task: (n/a)\n");
fprintf(fp, " get_xendump_regs: (n/a)\n");
fprintf(fp, " line_number_hooks: (not used)\n");
fprintf(fp, " last_pgd_read: %lx\n", machdep->last_pgd_read);
fprintf(fp, " last_pud_read: ");
if ((PAGESIZE() == 65536) ||
((PAGESIZE() == 4096) && !(machdep->flags & VM_L4_4K)))
fprintf(fp, "(not used)\n");
else
fprintf(fp, "%lx\n", machdep->last_pud_read);
fprintf(fp, " last_pmd_read: ");
if (PAGESIZE() == 65536)
fprintf(fp, "(not used)\n");
else
fprintf(fp, "%lx\n", machdep->last_pmd_read);
fprintf(fp, " last_ptbl_read: %lx\n", machdep->last_ptbl_read);
fprintf(fp, " clear_machdep_cache: arm64_clear_machdep_cache()\n");
fprintf(fp, " pgd: %lx\n", (ulong)machdep->pgd);
fprintf(fp, " pud: %lx\n", (ulong)machdep->pud);
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, " VA_BITS: %ld\n", ms->VA_BITS);
fprintf(fp, " userspace_top: %016lx\n", ms->userspace_top);
fprintf(fp, " page_offset: %016lx\n", ms->page_offset);
fprintf(fp, " vmalloc_start_addr: %016lx\n", ms->vmalloc_start_addr);
fprintf(fp, " vmalloc_end: %016lx\n", ms->vmalloc_end);
fprintf(fp, " modules_vaddr: %016lx\n", ms->modules_vaddr);
fprintf(fp, " modules_end: %016lx\n", ms->modules_end);
fprintf(fp, " vmemmap_vaddr: %016lx\n", ms->vmemmap_vaddr);
fprintf(fp, " vmemmap_end: %016lx\n", ms->vmemmap_end);
if (machdep->flags & NEW_VMEMMAP) {
fprintf(fp, " kimage_text: %016lx\n", ms->kimage_text);
fprintf(fp, " kimage_end: %016lx\n", ms->kimage_end);
fprintf(fp, " kimage_voffset: %016lx\n", ms->kimage_voffset);
}
fprintf(fp, " phys_offset: %lx\n", ms->phys_offset);
fprintf(fp, "__exception_text_start: %lx\n", ms->__exception_text_start);
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, " user_eframe_offset: %ld\n", ms->user_eframe_offset);
fprintf(fp, " kern_eframe_offset: %ld\n", ms->kern_eframe_offset);
fprintf(fp, " PTE_PROT_NONE: %lx\n", ms->PTE_PROT_NONE);
fprintf(fp, " PTE_FILE: ");
if (ms->PTE_FILE)
fprintf(fp, "%lx\n", ms->PTE_FILE);
else
fprintf(fp, "(unused)\n");
fprintf(fp, " __SWP_TYPE_BITS: %ld\n", ms->__SWP_TYPE_BITS);
fprintf(fp, " __SWP_TYPE_SHIFT: %ld\n", ms->__SWP_TYPE_SHIFT);
fprintf(fp, " __SWP_TYPE_MASK: %lx\n", ms->__SWP_TYPE_MASK);
fprintf(fp, " __SWP_OFFSET_BITS: ");
if (ms->__SWP_OFFSET_BITS)
fprintf(fp, "%ld\n", ms->__SWP_OFFSET_BITS);
else
fprintf(fp, "(unused)\n");
fprintf(fp, " __SWP_OFFSET_SHIFT: %ld\n", ms->__SWP_OFFSET_SHIFT);
fprintf(fp, " __SWP_OFFSET_MASK: ");
if (ms->__SWP_OFFSET_MASK)
fprintf(fp, "%lx\n", ms->__SWP_OFFSET_MASK);
else
fprintf(fp, "(unused)\n");
fprintf(fp, " crash_kexec_start: %lx\n", ms->crash_kexec_start);
fprintf(fp, " crash_kexec_end: %lx\n", ms->crash_kexec_end);
fprintf(fp, " crash_save_cpu_start: %lx\n", ms->crash_save_cpu_start);
fprintf(fp, " crash_save_cpu_end: %lx\n", ms->crash_save_cpu_end);
fprintf(fp, " kernel_flags: %lx\n", ms->kernel_flags);
fprintf(fp, " irq_stackbuf: %lx\n", (ulong)ms->irq_stackbuf);
if (machdep->flags & IRQ_STACKS) {
fprintf(fp, " irq_stack_size: %ld\n", ms->irq_stack_size);
for (i = 0; i < kt->cpus; i++)
fprintf(fp, " irq_stacks[%d]: %lx\n",
i, ms->irq_stacks[i]);
} else {
fprintf(fp, " irq_stack_size: (unused)\n");
fprintf(fp, " irq_stacks: (unused)\n");
}
}
static int
arm64_parse_machdep_arg_l(char *argstring, char *param, ulong *value)
{
int len;
int megabytes = FALSE;
char *p;
len = strlen(param);
if (!STRNEQ(argstring, param) || (argstring[len] != '='))
return FALSE;
if ((LASTCHAR(argstring) == 'm') ||
(LASTCHAR(argstring) == 'M')) {
LASTCHAR(argstring) = NULLCHAR;
megabytes = TRUE;
}
p = argstring + len + 1;
if (strlen(p)) {
int flags = RETURN_ON_ERROR | QUIET;
int err = 0;
if (megabytes) {
*value = dtol(p, flags, &err);
if (!err)
*value = MEGABYTES(*value);
} else {
*value = htol(p, flags, &err);
}
if (!err)
return TRUE;
}
return FALSE;
}
/*
* Parse machine dependent command line arguments.
*
* Force the phys_offset address via:
*
* --machdep phys_offset=<address>
*/
static void
arm64_parse_cmdline_args(void)
{
int index, i, c;
char *arglist[MAXARGS];
char buf[BUFSIZE];
char *p;
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++) {
if (arm64_parse_machdep_arg_l(arglist[i], "phys_offset",
&machdep->machspec->phys_offset)) {
error(NOTE,
"setting phys_offset to: 0x%lx\n\n",
machdep->machspec->phys_offset);
machdep->flags |= PHYS_OFFSET;
continue;
} else if (arm64_parse_machdep_arg_l(arglist[i], "kimage_voffset",
&machdep->machspec->kimage_voffset)) {
error(NOTE,
"setting kimage_voffset to: 0x%lx\n\n",
machdep->machspec->kimage_voffset);
continue;
}
error(WARNING, "ignoring --machdep option: %s\n",
arglist[i]);
}
}
}
static void
arm64_calc_kimage_voffset(void)
{
struct machine_specific *ms = machdep->machspec;
ulong phys_addr;
if (ms->kimage_voffset) /* vmcoreinfo, ioctl, or --machdep override */
return;
if (ACTIVE()) {
char buf[BUFSIZE];
char *p1;
int errflag;
FILE *iomem;
if ((iomem = fopen("/proc/iomem", "r")) == NULL)
return;
errflag = 1;
while (fgets(buf, BUFSIZE, iomem)) {
if(strstr(buf, ": Kernel code")) {
errflag = 0;
break;
}
if (strstr(buf, ": System RAM")) {
clean_line(buf);
if (!(p1 = strstr(buf, "-")))
continue;
*p1 = NULLCHAR;
phys_addr = htol(buf, RETURN_ON_ERROR | QUIET, NULL);
if (phys_addr == BADADDR)
continue;
}
}
fclose(iomem);
if (errflag)
return;
} else if (KDUMP_DUMPFILE())
arm_kdump_phys_base(&phys_addr); /* Get start address of first memory block */
else {
error(WARNING,
"kimage_voffset cannot be determined from the dumpfile.\n");
error(CONT,
"Using default value of 0. If this is not correct, then try\n");
error(CONT,
"using the command line option: --machdep kimage_voffset=<addr>\n");
return;
}
ms->kimage_voffset = ms->vmalloc_start_addr - phys_addr;
if ((kt->flags2 & KASLR) && (kt->flags & RELOC_SET))
ms->kimage_voffset += (kt->relocate * -1);
}
static void
arm64_calc_phys_offset(void)
{
struct machine_specific *ms = machdep->machspec;
ulong phys_offset;
if (machdep->flags & PHYS_OFFSET) /* --machdep override */
return;
/*
* Next determine suitable value for phys_offset. User can override this
* by passing valid '--machdep phys_offset=<addr>' option.
*/
ms->phys_offset = 0;
if (ACTIVE()) {
char buf[BUFSIZE];
char *p1;
int errflag;
FILE *iomem;
physaddr_t paddr;
struct syment *sp;
if ((machdep->flags & NEW_VMEMMAP) &&
ms->kimage_voffset && (sp = kernel_symbol_search("memstart_addr"))) {
paddr = sp->value - machdep->machspec->kimage_voffset;
if (READMEM(pc->mfd, &phys_offset, sizeof(phys_offset),
sp->value, paddr) > 0) {
ms->phys_offset = phys_offset;
return;
}
}
if ((iomem = fopen("/proc/iomem", "r")) == NULL)
return;
/*
* Memory regions are sorted in ascending order. We take the
* first region which should be correct for most uses.
*/
errflag = 1;
while (fgets(buf, BUFSIZE, iomem)) {
if (strstr(buf, ": System RAM")) {
clean_line(buf);
errflag = 0;
break;
}
}
fclose(iomem);
if (errflag)
return;
if (!(p1 = strstr(buf, "-")))
return;
*p1 = NULLCHAR;
phys_offset = htol(buf, RETURN_ON_ERROR | QUIET, &errflag);
if (errflag)
return;
ms->phys_offset = phys_offset;
} else if (DISKDUMP_DUMPFILE() && diskdump_phys_base(&phys_offset)) {
ms->phys_offset = phys_offset;
} else if (KDUMP_DUMPFILE() && arm64_kdump_phys_base(&phys_offset)) {
ms->phys_offset = phys_offset;
} else {
error(WARNING,
"phys_offset cannot be determined from the dumpfile.\n");
error(CONT,
"Using default value of 0. If this is not correct, then try\n");
error(CONT,
"using the command line option: --machdep phys_offset=<addr>\n");
}
if (CRASHDEBUG(1))
fprintf(fp, "using %lx as phys_offset\n", ms->phys_offset);
}
/*
* Determine PHYS_OFFSET either by reading VMCOREINFO or the kernel
* symbol, otherwise borrow the 32-bit ARM functionality.
*/
static int
arm64_kdump_phys_base(ulong *phys_offset)
{
char *string;
struct syment *sp;
physaddr_t paddr;
if ((string = pc->read_vmcoreinfo("NUMBER(PHYS_OFFSET)"))) {
*phys_offset = htol(string, QUIET, NULL);
free(string);
return TRUE;
}
if ((machdep->flags & NEW_VMEMMAP) &&
machdep->machspec->kimage_voffset &&
(sp = kernel_symbol_search("memstart_addr"))) {
paddr = sp->value - machdep->machspec->kimage_voffset;
if (READMEM(-1, phys_offset, sizeof(*phys_offset),
sp->value, paddr) > 0)
return TRUE;
}
return arm_kdump_phys_base(phys_offset);
}
static void
arm64_init_kernel_pgd(void)
{
int i;
ulong value;
if (!kernel_symbol_exists("init_mm") ||
!readmem(symbol_value("init_mm") + OFFSET(mm_struct_pgd), KVADDR,
&value, sizeof(void *), "init_mm.pgd", RETURN_ON_ERROR)) {
if (kernel_symbol_exists("swapper_pg_dir"))
value = symbol_value("swapper_pg_dir");
else {
error(WARNING, "cannot determine kernel pgd location\n");
return;
}
}
for (i = 0; i < NR_CPUS; i++)
vt->kernel_pgd[i] = value;
}
ulong
arm64_VTOP(ulong addr)
{
if (machdep->flags & NEW_VMEMMAP) {
if (addr >= machdep->machspec->page_offset)
return machdep->machspec->phys_offset
+ (addr - machdep->machspec->page_offset);
else if (machdep->machspec->kimage_voffset)
return addr - machdep->machspec->kimage_voffset;
else /* no randomness */
return machdep->machspec->phys_offset
+ (addr - machdep->machspec->vmalloc_start_addr);
} else {
return machdep->machspec->phys_offset
+ (addr - machdep->machspec->page_offset);
}
}
static int
arm64_kvtop(struct task_context *tc, ulong kvaddr, physaddr_t *paddr, int verbose)
{
ulong kernel_pgd;
if (!IS_KVADDR(kvaddr))
return FALSE;
if (!vt->vmalloc_start) {
*paddr = VTOP(kvaddr);
return TRUE;
}
if (!IS_VMALLOC_ADDR(kvaddr)) {
*paddr = VTOP(kvaddr);
if (!verbose)
return TRUE;
}
kernel_pgd = vt->kernel_pgd[0];
*paddr = 0;
switch (machdep->flags & (VM_L2_64K|VM_L3_64K|VM_L3_4K|VM_L4_4K))
{
case VM_L2_64K:
return arm64_vtop_2level_64k(kernel_pgd, kvaddr, paddr, verbose);
case VM_L3_64K:
return arm64_vtop_3level_64k(kernel_pgd, kvaddr, paddr, verbose);
case VM_L3_4K:
return arm64_vtop_3level_4k(kernel_pgd, kvaddr, paddr, verbose);
case VM_L4_4K:
return arm64_vtop_4level_4k(kernel_pgd, kvaddr, paddr, verbose);
default:
return FALSE;
}
}
static int
arm64_uvtop(struct task_context *tc, ulong uvaddr, physaddr_t *paddr, int verbose)
{
ulong user_pgd;
readmem(tc->mm_struct + OFFSET(mm_struct_pgd), KVADDR,
&user_pgd, sizeof(long), "user pgd", FAULT_ON_ERROR);
*paddr = 0;