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riscv64.c
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riscv64.c
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/* riscv64.c - core analysis suite
*
* Copyright (C) 2022 Alibaba Group Holding Limited.
*
* 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.
*/
#include "defs.h"
#ifdef RISCV64
#include <elf.h>
#include <math.h>
static ulong riscv64_get_page_size(void);
static int riscv64_vtop_3level_4k(ulong *pgd, ulong vaddr,
physaddr_t *paddr, int verbose);
static int riscv64_vtop_4level_4k(ulong *pgd, ulong vaddr,
physaddr_t *paddr, int verbose);
static int riscv64_vtop_5level_4k(ulong *pgd, ulong vaddr,
physaddr_t *paddr, int verbose);
static void riscv64_page_type_init(void);
static int riscv64_is_kvaddr(ulong vaddr);
static int riscv64_is_uvaddr(ulong vaddr, struct task_context *tc);
static int riscv64_uvtop(struct task_context *tc, ulong vaddr,
physaddr_t *paddr, int verbose);
static int riscv64_kvtop(struct task_context *tc, ulong kvaddr,
physaddr_t *paddr, int verbose);
static void riscv64_cmd_mach(void);
static void riscv64_stackframe_init(void);
static void riscv64_back_trace_cmd(struct bt_info *bt);
static int riscv64_get_dumpfile_stack_frame(struct bt_info *bt,
ulong *nip, ulong *ksp);
static void riscv64_get_stack_frame(struct bt_info *bt, ulong *pcp,
ulong *spp);
static int riscv64_get_frame(struct bt_info *bt, ulong *pcp,
ulong *spp);
static void riscv64_display_full_frame(struct bt_info *bt,
struct riscv64_unwind_frame *current,
struct riscv64_unwind_frame *previous);
static int riscv64_translate_pte(ulong, void *, ulonglong);
static int riscv64_init_active_task_regs(void);
static int riscv64_get_crash_notes(void);
static int riscv64_get_elf_notes(void);
static void riscv64_get_va_range(struct machine_specific *ms);
static void riscv64_get_va_bits(struct machine_specific *ms);
static void riscv64_get_struct_page_size(struct machine_specific *ms);
#define REG_FMT "%016lx"
#define SZ_2G 0x80000000
/*
* Holds registers during the crash.
*/
static struct riscv64_register *panic_task_regs;
/* from arch/riscv/include/asm/stacktrace.h */
struct stackframe {
ulong fp;
ulong ra;
};
static struct machine_specific riscv64_machine_specific = {
._page_present = (1 << 0),
._page_read = (1 << 1),
._page_write = (1 << 2),
._page_exec = (1 << 3),
._page_user = (1 << 4),
._page_global = (1 << 5),
._page_accessed = (1 << 6),
._page_dirty = (1 << 7),
._page_soft = (1 << 8),
.va_bits = 0,
.struct_page_size = 0,
};
static void
pt_level_alloc(char **lvl, char *name)
{
size_t sz = PAGESIZE();
void *pointer = malloc(sz);
if (!pointer)
error(FATAL, name);
*lvl = pointer;
}
static ulong
riscv64_get_page_size(void)
{
return memory_page_size();
}
static ulong
riscv64_vmalloc_start(void)
{
return ((ulong)VMALLOC_START);
}
/* Get the size of struct page {} */
static void riscv64_get_struct_page_size(struct machine_specific *ms)
{
char *string;
string = pc->read_vmcoreinfo("SIZE(page)");
if (string) {
ms->struct_page_size = atol(string);
free(string);
}
}
/*
* "mach" command output.
*/
static void
riscv64_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());
}
static void
riscv64_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);
riscv64_display_machine_stats();
}
/*
* Accept or reject a symbol from the kernel namelist.
*/
static int
riscv64_verify_symbol(const char *name, ulong value, char type)
{
if (CRASHDEBUG(8) && name && strlen(name))
fprintf(fp, "%08lx %s\n", value, name);
if (!(machdep->flags & KSYMS_START)) {
if (STREQ(name, "_text") || STREQ(name, "_stext"))
machdep->flags |= KSYMS_START;
return (name && strlen(name) && !STRNEQ(name, "__func__.") &&
!STRNEQ(name, "__crc_"));
}
return TRUE;
}
void
riscv64_dump_machdep_table(ulong arg)
{
int others = 0;
fprintf(fp, " flags: %lx (", machdep->flags);
if (machdep->flags & KSYMS_START)
fprintf(fp, "%sKSYMS_START", 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: %llx\n", machdep->pagemask);
fprintf(fp, " pageoffset: %lx\n", machdep->pageoffset);
fprintf(fp, " pgdir_shift: %ld\n", machdep->machspec->va_bits - 9);
fprintf(fp, " ptrs_per_pgd: %u\n", PTRS_PER_PGD);
fprintf(fp, " ptrs_per_pte: %d\n", PTRS_PER_PTE);
fprintf(fp, " stacksize: %ld\n", machdep->stacksize);
fprintf(fp, " hz: %d\n", machdep->hz);
fprintf(fp, " memsize: %ld (0x%lx)\n",
machdep->memsize, machdep->memsize);
fprintf(fp, " bits: %d\n", machdep->bits);
fprintf(fp, " back_trace: riscv64_back_trace_cmd()\n");
fprintf(fp, " processor_speed: riscv64_processor_speed()\n");
fprintf(fp, " uvtop: riscv64_uvtop()\n");
fprintf(fp, " kvtop: riscv64_kvtop()\n");
fprintf(fp, " get_stack_frame: riscv64_get_stack_frame()\n");
fprintf(fp, " get_stackbase: generic_get_stackbase()\n");
fprintf(fp, " get_stacktop: generic_get_stacktop()\n");
fprintf(fp, " translate_pte: riscv64_translate_pte()\n");
fprintf(fp, " memory_size: generic_memory_size()\n");
fprintf(fp, " vmalloc_start: riscv64_vmalloc_start()\n");
fprintf(fp, " is_task_addr: riscv64_is_task_addr()\n");
fprintf(fp, " verify_symbol: riscv64_verify_symbol()\n");
fprintf(fp, " dis_filter: generic_dis_filter()\n");
fprintf(fp, " dump_irq: generic_dump_irq()\n");
fprintf(fp, " show_interrupts: generic_show_interrupts()\n");
fprintf(fp, " get_irq_affinity: generic_get_irq_affinity()\n");
fprintf(fp, " cmd_mach: riscv64_cmd_mach()\n");
fprintf(fp, " get_smp_cpus: riscv64_get_smp_cpus()\n");
fprintf(fp, " is_kvaddr: riscv64_is_kvaddr()\n");
fprintf(fp, " is_uvaddr: riscv64_is_uvaddr()\n");
fprintf(fp, " verify_paddr: generic_verify_paddr()\n");
fprintf(fp, " init_kernel_pgd: NULL\n");
fprintf(fp, " value_to_symbol: generic_machdep_value_to_symbol()\n");
fprintf(fp, " line_number_hooks: NULL\n");
fprintf(fp, " last_pgd_read: %lx\n", machdep->last_pgd_read);
fprintf(fp, " last_p4d_read: %lx\n", machdep->machspec->last_p4d_read);
fprintf(fp, " last_pud_read: %lx\n", machdep->last_pud_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, " pgd: %lx\n", (ulong)machdep->pgd);
fprintf(fp, " p4d: %lx\n", (ulong)machdep->machspec->p4d);
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, " 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);
fprintf(fp, " machspec: %lx\n", (ulong)machdep->machspec);
}
static ulong
riscv64_processor_speed(void)
{
/* TODO: */
return 0;
}
static unsigned long riscv64_get_kernel_version(void)
{
char *string;
if (THIS_KERNEL_VERSION)
return THIS_KERNEL_VERSION;
if ((string = pc->read_vmcoreinfo("OSRELEASE"))) {
parse_kernel_version(string);
free(string);
}
return THIS_KERNEL_VERSION;
}
static void
riscv64_get_phys_ram_base(struct machine_specific *ms)
{
unsigned long kernel_version = riscv64_get_kernel_version();
/*
* phys_ram_base is defined in Linux kernel since 5.14.
*/
if (kernel_version >= LINUX(5,14,0)) {
char *string;
if ((string = pc->read_vmcoreinfo("NUMBER(phys_ram_base)"))) {
ms->phys_base = atol(string);
free(string);
} else
error(FATAL, "cannot read phys_ram_base\n");
} else
/*
* For qemu rv64 env and hardware platform, default phys base
* may different, eg,
* hardware platform: 0x200000
* qemu rv64 env: 0x80200000
*
* But we only can set one default value, in this case, qemu
* rv64 env may can't work.
*/
ms->phys_base = 0x200000;
}
static void riscv64_get_va_bits(struct machine_specific *ms)
{
unsigned long kernel_version = riscv64_get_kernel_version();
/*
* VA_BITS is defined in Linux kernel since 5.17. So we use the
* default va bits 39 when Linux version < 5.17.
*/
if (kernel_version >= LINUX(5,17,0)) {
char *string;
if ((string = pc->read_vmcoreinfo("NUMBER(VA_BITS)"))) {
ms->va_bits = atol(string);
free(string);
}
} else
ms->va_bits = 39;
}
static void riscv64_get_va_range(struct machine_specific *ms)
{
unsigned long kernel_version = riscv64_get_kernel_version();
char *string;
if ((string = pc->read_vmcoreinfo("NUMBER(PAGE_OFFSET)"))) {
ms->page_offset = htol(string, QUIET, NULL);
free(string);
} else
goto error;
if ((string = pc->read_vmcoreinfo("NUMBER(VMALLOC_START)"))) {
ms->vmalloc_start_addr = htol(string, QUIET, NULL);
free(string);
} else
goto error;
if ((string = pc->read_vmcoreinfo("NUMBER(VMALLOC_END)"))) {
ms->vmalloc_end = htol(string, QUIET, NULL);
free(string);
} else
goto error;
if ((string = pc->read_vmcoreinfo("NUMBER(VMEMMAP_START)"))) {
ms->vmemmap_vaddr = htol(string, QUIET, NULL);
free(string);
} else
goto error;
if ((string = pc->read_vmcoreinfo("NUMBER(VMEMMAP_END)"))) {
ms->vmemmap_end = htol(string, QUIET, NULL);
free(string);
} else
goto error;
if ((string = pc->read_vmcoreinfo("NUMBER(KERNEL_LINK_ADDR)"))) {
ms->kernel_link_addr = htol(string, QUIET, NULL);
free(string);
} else
goto error;
if ((kt->flags2 & KASLR) && (kt->flags & RELOC_SET))
ms->kernel_link_addr += (kt->relocate * -1);
/*
* From Linux 5.13, the kernel mapping is moved to the last 2GB
* of the address space, modules use the 2GB memory range right
* before the kernel. Before Linux 5.13, modules area is embedded
* in vmalloc area.
*
*/
if (kernel_version >= LINUX(5,13,0)) {
if ((string = pc->read_vmcoreinfo("NUMBER(MODULES_VADDR)"))) {
ms->modules_vaddr = htol(string, QUIET, NULL);
free(string);
} else
goto error;
if ((string = pc->read_vmcoreinfo("NUMBER(MODULES_END)"))) {
ms->modules_end = htol(string, QUIET, NULL);
free(string);
} else
goto error;
} else {
ms->modules_vaddr = ms->vmalloc_start_addr;
ms->modules_end = ms->vmalloc_end;
}
if (CRASHDEBUG(1)) {
fprintf(fp, "vmemmap : 0x%lx - 0x%lx\n",
ms->vmemmap_vaddr, ms->vmemmap_end);
fprintf(fp, "vmalloc : 0x%lx - 0x%lx\n",
ms->vmalloc_start_addr, ms->vmalloc_end);
fprintf(fp, "mudules : 0x%lx - 0x%lx\n",
ms->modules_vaddr, ms->modules_end);
fprintf(fp, "lowmem : 0x%lx -\n", ms->page_offset);
fprintf(fp, "kernel link addr : 0x%lx\n",
ms->kernel_link_addr);
}
return;
error:
error(FATAL, "cannot get vm layout\n");
}
static void
riscv64_get_va_kernel_pa_offset(struct machine_specific *ms)
{
unsigned long kernel_version = riscv64_get_kernel_version();
/*
* Since Linux v6.4 phys_base is not the physical start of the kernel,
* trying to use "va_kernel_pa_offset" to determine the offset between
* kernel virtual and physical addresses.
*/
if (kernel_version >= LINUX(6,4,0)) {
char *string;
if ((string = pc->read_vmcoreinfo("NUMBER(va_kernel_pa_offset)"))) {
ms->va_kernel_pa_offset = htol(string, QUIET, NULL);
free(string);
} else
error(FATAL, "cannot read va_kernel_pa_offset\n");
}
else
ms->va_kernel_pa_offset = ms->kernel_link_addr - ms->phys_base;
}
static int
riscv64_is_kvaddr(ulong vaddr)
{
if (IS_VMALLOC_ADDR(vaddr))
return TRUE;
return (vaddr >= machdep->kvbase);
}
static int
riscv64_is_uvaddr(ulong vaddr, struct task_context *unused)
{
if (IS_VMALLOC_ADDR(vaddr))
return FALSE;
return (vaddr < machdep->kvbase);
}
static int
riscv64_is_task_addr(ulong task)
{
if (tt->flags & THREAD_INFO)
return IS_KVADDR(task);
return (IS_KVADDR(task) && ALIGNED_STACK_OFFSET(task) == 0);
}
static int
riscv64_get_smp_cpus(void)
{
return (get_cpus_present() > 0) ? get_cpus_present() : kt->cpus;
}
/*
* Include both vmalloc'd and module address space as VMALLOC space.
*/
int
riscv64_IS_VMALLOC_ADDR(ulong vaddr)
{
return ((vaddr >= VMALLOC_START && vaddr <= VMALLOC_END) ||
(vaddr >= VMEMMAP_VADDR && vaddr <= VMEMMAP_END) ||
(vaddr >= MODULES_VADDR && vaddr <= MODULES_END));
}
/*
* Translate a PTE, returning TRUE if the page is present.
* If a physaddr pointer is passed in, don't print anything.
*/
static int
riscv64_translate_pte(ulong pte, void *physaddr, ulonglong unused)
{
char ptebuf[BUFSIZE];
char physbuf[BUFSIZE];
char buf[BUFSIZE];
int page_present;
int len1, len2, others;
ulong paddr;
paddr = PTOB(pte >> _PAGE_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(READ);
CHECK_PAGE_FLAG(WRITE);
CHECK_PAGE_FLAG(EXEC);
CHECK_PAGE_FLAG(USER);
CHECK_PAGE_FLAG(GLOBAL);
CHECK_PAGE_FLAG(ACCESSED);
CHECK_PAGE_FLAG(DIRTY);
CHECK_PAGE_FLAG(SOFT);
} else {
fprintf(fp, "no mapping");
}
fprintf(fp, ")\n");
return page_present;
}
static void
riscv64_page_type_init(void)
{
ulong va_bits = machdep->machspec->va_bits;
/*
* For RISCV64 arch, any level of PTE may be a leaf PTE,
* so in addition to 4KiB pages,
* Sv39 supports 2 MiB megapages, 1 GiB gigapages;
* Sv48 supports 2 MiB megapages, 1 GiB gigapages, 512 GiB terapages;
* Sv57 supports 2 MiB megapages, 1 GiB gigapages, 512 GiB terapages, and 256 TiB petapages.
*
* refs to riscv-privileged spec.
*
* We just support 4KiB, 2MiB, 1GiB now.
*/
switch (machdep->pagesize)
{
case 0x1000: // 4 KiB
machdep->flags |= (va_bits == 57 ? VM_L5_4K :
(va_bits == 48 ? VM_L4_4K : VM_L3_4K));
break;
case 0x200000: // 2 MiB
/* TODO: */
case 0x40000000: // 1 GiB
/* TODO: */
default:
if (machdep->pagesize)
error(FATAL, "invalid/unsupported page size: %d\n",
machdep->pagesize);
else
error(FATAL, "cannot determine page size\n");
}
}
static int
riscv64_vtop_3level_4k(ulong *pgd, ulong vaddr, physaddr_t *paddr, int verbose)
{
ulong *pgd_ptr, pgd_val;
ulong pmd_val;
ulong pte_val, pte_pfn;
ulong pt_phys;
/* PGD */
pgd_ptr = pgd + pgd_index_l3_4k(vaddr);
FILL_PGD(pgd, KVADDR, PAGESIZE());
pgd_val = ULONG(machdep->pgd + PAGEOFFSET(pgd_ptr));
if (verbose)
fprintf(fp, " PGD: %lx => %lx\n", (ulong)pgd_ptr, pgd_val);
if (!pgd_val)
goto no_page;
pgd_val &= PTE_PFN_PROT_MASK;
pt_phys = (pgd_val >> _PAGE_PFN_SHIFT) << PAGESHIFT();
/* PMD */
FILL_PMD(PAGEBASE(pt_phys), PHYSADDR, PAGESIZE());
pmd_val = ULONG(machdep->pmd + PAGEOFFSET(sizeof(pmd_t) *
pmd_index_l3_4k(vaddr)));
if (verbose)
fprintf(fp, " PMD: %016lx => %016lx\n", pt_phys, pmd_val);
if (!pmd_val)
goto no_page;
pmd_val &= PTE_PFN_PROT_MASK;
pt_phys = (pmd_val >> _PAGE_PFN_SHIFT) << PAGESHIFT();
/* PTE */
FILL_PTBL(PAGEBASE(pt_phys), PHYSADDR, PAGESIZE());
pte_val = ULONG(machdep->ptbl + PAGEOFFSET(sizeof(pte_t) *
pte_index_l3_4k(vaddr)));
if (verbose)
fprintf(fp, " PTE: %lx => %lx\n", pt_phys, pte_val);
if (!pte_val)
goto no_page;
pte_val &= PTE_PFN_PROT_MASK;
pte_pfn = pte_val >> _PAGE_PFN_SHIFT;
if (!(pte_val & _PAGE_PRESENT)) {
if (verbose) {
fprintf(fp, "\n");
riscv64_translate_pte((ulong)pte_val, 0, 0);
}
fprintf(fp, " PAGE: %016lx not present\n\n", PAGEBASE(*paddr));
return FALSE;
}
*paddr = PTOB(pte_pfn) + PAGEOFFSET(vaddr);
if (verbose) {
fprintf(fp, " PAGE: %016lx\n\n", PAGEBASE(*paddr));
riscv64_translate_pte(pte_val, 0, 0);
}
return TRUE;
no_page:
fprintf(fp, "invalid\n");
return FALSE;
}
/*
* 'bt -f' command output
* Display all stack data contained in a frame
*/
static void
riscv64_display_full_frame(struct bt_info *bt, struct riscv64_unwind_frame *current,
struct riscv64_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
riscv64_stackframe_init(void)
{
long task_struct_thread = MEMBER_OFFSET("task_struct", "thread");
/* from arch/riscv/include/asm/processor.h */
long thread_reg_ra = MEMBER_OFFSET("thread_struct", "ra");
long thread_reg_sp = MEMBER_OFFSET("thread_struct", "sp");
long thread_reg_fp = MEMBER_OFFSET("thread_struct", "s");
if ((task_struct_thread == INVALID_OFFSET) ||
(thread_reg_ra == INVALID_OFFSET) ||
(thread_reg_sp == INVALID_OFFSET) ||
(thread_reg_fp == INVALID_OFFSET) )
error(FATAL,
"cannot determine thread_struct offsets\n");
ASSIGN_OFFSET(task_struct_thread_context_pc) =
task_struct_thread + thread_reg_ra;
ASSIGN_OFFSET(task_struct_thread_context_sp) =
task_struct_thread + thread_reg_sp;
ASSIGN_OFFSET(task_struct_thread_context_fp) =
task_struct_thread + thread_reg_fp;
}
static void
riscv64_dump_backtrace_entry(struct bt_info *bt, struct syment *sym,
struct riscv64_unwind_frame *current,
struct riscv64_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];
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);
}
/* bt -f */
if (bt->flags & BT_FULL) {
fprintf(fp, " "
"[PC: %016lx RA: %016lx SP: %016lx SIZE: %ld]\n",
current->pc,
previous->pc,
current->sp,
previous->sp - current->sp);
riscv64_display_full_frame(bt, current, previous);
}
}
/*
* Unroll a kernel stack.
*/
static void
riscv64_back_trace_cmd(struct bt_info *bt)
{
struct riscv64_unwind_frame current, previous;
struct stackframe curr_frame;
int level = 0;
if (bt->flags & BT_REGS_NOT_FOUND)
return;
current.pc = bt->instptr;
current.sp = bt->stkptr;
current.fp = bt->frameptr;
if (!INSTACK(current.sp, bt))
return;
for (;;) {
struct syment *symbol = NULL;
struct stackframe *frameptr;
ulong low, high;
ulong offset;
if (CRASHDEBUG(8))
fprintf(fp, "level %d pc %#lx sp %lx fp 0x%lx\n",
level, current.pc, current.sp, current.fp);
/* Validate frame pointer */
low = current.sp + sizeof(struct stackframe);
high = bt->stacktop;
if (current.fp < low || current.fp > high || current.fp & 0x7) {
if (CRASHDEBUG(8))
fprintf(fp, "fp 0x%lx sp 0x%lx low 0x%lx high 0x%lx\n",
current.fp, current.sp, low, high);
return;
}
symbol = value_search(current.pc, &offset);
if (!symbol)
return;
frameptr = (struct stackframe *)current.fp - 1;
if (!readmem((ulong)frameptr, KVADDR, &curr_frame,
sizeof(curr_frame), "get stack frame", RETURN_ON_ERROR))
return;
previous.pc = curr_frame.ra;
previous.fp = curr_frame.fp;
previous.sp = current.fp;
riscv64_dump_backtrace_entry(bt, symbol, ¤t, &previous, level++);
current.pc = previous.pc;
current.fp = previous.fp;
current.sp = previous.sp;
if (CRASHDEBUG(8))
fprintf(fp, "next %d pc %#lx sp %#lx fp %lx\n",
level, current.pc, current.sp, current.fp);
}
}
/*
* Get a stack frame combination of pc and ra from the most relevant spot.
*/
static void
riscv64_get_stack_frame(struct bt_info *bt, ulong *pcp, ulong *spp)
{
ulong ksp = 0, nip = 0;
int ret = 0;
if (DUMPFILE() && is_task_active(bt->task))
ret = riscv64_get_dumpfile_stack_frame(bt, &nip, &ksp);
else
ret = riscv64_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
riscv64_get_dumpfile_stack_frame(struct bt_info *bt, ulong *nip, ulong *ksp)
{
const struct machine_specific *ms = machdep->machspec;
struct riscv64_register *regs;
ulong epc, sp;
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[RISCV64_REGS_EPC];
sp = regs->regs[RISCV64_REGS_SP];
/*
* Set stack frame ptr.
*/
bt->frameptr = regs->regs[RISCV64_REGS_FP];
if (nip)
*nip = epc;
if (ksp)
*ksp = sp;
bt->machdep = regs;
return TRUE;
}
/*
* Do the work for riscv64_get_stack_frame() for non-active tasks.
* Get SP and PC values for idle tasks.
*/
static int
riscv64_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_context_pc),
KVADDR, pcp, sizeof(*pcp),
"thread_struct.ra",
RETURN_ON_ERROR))
return FALSE;
if (!readmem(bt->task + OFFSET(task_struct_thread_context_sp),
KVADDR, spp, sizeof(*spp),
"thread_struct.sp",
RETURN_ON_ERROR))
return FALSE;
if (!readmem(bt->task + OFFSET(task_struct_thread_context_fp),
KVADDR, &bt->frameptr, sizeof(bt->frameptr),
"thread_struct.fp",
RETURN_ON_ERROR))
return FALSE;
return TRUE;
}
static int
riscv64_vtop_4level_4k(ulong *pgd, ulong vaddr, physaddr_t *paddr, int verbose)
{
ulong *pgd_ptr, pgd_val;
ulong pud_val;
ulong pmd_val;
ulong pte_val, pte_pfn;
ulong pt_phys;
/* PGD */
pgd_ptr = pgd + pgd_index_l4_4k(vaddr);
FILL_PGD(pgd, KVADDR, PAGESIZE());
pgd_val = ULONG(machdep->pgd + PAGEOFFSET(pgd_ptr));
if (verbose)
fprintf(fp, " PGD: %lx => %lx\n", (ulong)pgd_ptr, pgd_val);
if (!pgd_val)
goto no_page;
pgd_val &= PTE_PFN_PROT_MASK;
pt_phys = (pgd_val >> _PAGE_PFN_SHIFT) << PAGESHIFT();
/* PUD */
FILL_PUD(PAGEBASE(pt_phys), PHYSADDR, PAGESIZE());
pud_val = ULONG(machdep->pud + PAGEOFFSET(sizeof(pud_t) *
pud_index_l4_4k(vaddr)));
if (verbose)
fprintf(fp, " PUD: %016lx => %016lx\n", pt_phys, pud_val);
if (!pud_val)
goto no_page;
pud_val &= PTE_PFN_PROT_MASK;
pt_phys = (pud_val >> _PAGE_PFN_SHIFT) << PAGESHIFT();
/* PMD */
FILL_PMD(PAGEBASE(pt_phys), PHYSADDR, PAGESIZE());
pmd_val = ULONG(machdep->pmd + PAGEOFFSET(sizeof(pmd_t) *
pmd_index_l4_4k(vaddr)));
if (verbose)
fprintf(fp, " PMD: %016lx => %016lx\n", pt_phys, pmd_val);
if (!pmd_val)
goto no_page;
pmd_val &= PTE_PFN_PROT_MASK;
pt_phys = (pmd_val >> _PAGE_PFN_SHIFT) << PAGESHIFT();
/* PTE */
FILL_PTBL(PAGEBASE(pt_phys), PHYSADDR, PAGESIZE());
pte_val = ULONG(machdep->ptbl + PAGEOFFSET(sizeof(pte_t) *
pte_index_l4_4k(vaddr)));
if (verbose)
fprintf(fp, " PTE: %lx => %lx\n", pt_phys, pte_val);
if (!pte_val)
goto no_page;
pte_val &= PTE_PFN_PROT_MASK;
pte_pfn = pte_val >> _PAGE_PFN_SHIFT;
if (!(pte_val & _PAGE_PRESENT)) {
if (verbose) {
fprintf(fp, "\n");
riscv64_translate_pte((ulong)pte_val, 0, 0);
}
fprintf(fp, " PAGE: %016lx not present\n\n", PAGEBASE(*paddr));
return FALSE;
}
*paddr = PTOB(pte_pfn) + PAGEOFFSET(vaddr);
if (verbose) {
fprintf(fp, " PAGE: %016lx\n\n", PAGEBASE(*paddr));
riscv64_translate_pte(pte_val, 0, 0);
}
return TRUE;
no_page:
fprintf(fp, "invalid\n");
return FALSE;
}
static int
riscv64_vtop_5level_4k(ulong *pgd, ulong vaddr, physaddr_t *paddr, int verbose)
{
ulong *pgd_ptr, pgd_val;
ulong p4d_val;
ulong pud_val;
ulong pmd_val;
ulong pte_val, pte_pfn;
ulong pt_phys;
/* PGD */
pgd_ptr = pgd + pgd_index_l5_4k(vaddr);
FILL_PGD(pgd, KVADDR, PAGESIZE());
pgd_val = ULONG(machdep->pgd + PAGEOFFSET(pgd_ptr));
if (verbose)
fprintf(fp, " PGD: %lx => %lx\n", (ulong)pgd_ptr, pgd_val);
if (!pgd_val)
goto no_page;
pgd_val &= PTE_PFN_PROT_MASK;
pt_phys = (pgd_val >> _PAGE_PFN_SHIFT) << PAGESHIFT();
/* P4D */
FILL_P4D(PAGEBASE(pt_phys), PHYSADDR, PAGESIZE());
p4d_val = ULONG(machdep->machspec->p4d + PAGEOFFSET(sizeof(p4d_t) *
p4d_index_l5_4k(vaddr)));
if (verbose)
fprintf(fp, " P4D: %016lx => %016lx\n", pt_phys, p4d_val);