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ppc.c
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ppc.c
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/* ppc.c - core analysis suite
*
* Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc.
* Copyright (C) 2002-2007, 2010-2014 David Anderson
* Copyright (C) 2002-2007, 2010-2014 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 PPC
#include "defs.h"
#include <elf.h>
#define MAX_PLATFORM_LEN 32 /* length for platform string */
/*
* This structure was copied from kernel source
* in include/asm-ppc/ptrace.h
*/
struct ppc_pt_regs {
long gpr[32];
long nip;
long msr;
long orig_gpr3; /* Used for restarting system calls */
long ctr;
long link;
long xer;
long ccr;
long mq; /* 601 only (not used at present) */
/* Used on APUS to hold IPL value. */
long trap; /* Reason for being here */
long dar; /* Fault registers */
long dsisr;
long result; /* Result of a system call */
};
static int ppc_kvtop(struct task_context *, ulong, physaddr_t *, int);
static int ppc_uvtop(struct task_context *, ulong, physaddr_t *, int);
static ulong ppc_vmalloc_start(void);
static int ppc_is_task_addr(ulong);
static int ppc_verify_symbol(const char *, ulong, char);
static ulong ppc_get_task_pgd(ulong);
static int ppc_translate_pte(ulong, void *, ulonglong);
static ulong ppc_processor_speed(void);
static int ppc_eframe_search(struct bt_info *);
static ulong ppc_in_irqstack(ulong);
static void ppc_back_trace_cmd(struct bt_info *);
static void ppc_back_trace(struct gnu_request *, struct bt_info *);
static void get_ppc_frame(struct bt_info *, ulong *, ulong *);
static void ppc_print_stack_entry(int,struct gnu_request *,
ulong, ulong, struct bt_info *);
static char *ppc_check_eframe(struct ppc_pt_regs *);
static void ppc_print_eframe(char *, struct ppc_pt_regs *, struct bt_info *);
static void ppc_print_regs(struct ppc_pt_regs *);
static void ppc_display_full_frame(struct bt_info *, ulong, FILE *);
static void ppc_dump_irq(int);
static void ppc_get_stack_frame(struct bt_info *, ulong *, ulong *);
static int ppc_dis_filter(ulong, char *, unsigned int);
static void ppc_cmd_mach(void);
static int ppc_get_smp_cpus(void);
static void ppc_display_machine_stats(void);
static void ppc_dump_line_number(ulong);
static struct line_number_hook ppc_line_number_hooks[];
static struct machine_specific ppc_machine_specific = { 0 };
static int probe_default_platform(char *);
static int probe_ppc44x_platform(char *);
static int probe_ppce500_platform(char *);
static void ppc_probe_base_platform(void);
typedef int (*probe_func_t) (char *);
probe_func_t probe_platforms[] = {
probe_ppc44x_platform, /* 44x chipsets */
probe_ppce500_platform, /* E500 chipsets */
probe_default_platform, /* This should be at the end */
NULL
};
/* Don't forget page flags definitions for each platform */
#define PLATFORM_PAGE_FLAGS_SETUP(PLT) \
do { \
_PAGE_PRESENT = PLT##_PAGE_PRESENT; \
_PAGE_USER = PLT##_PAGE_USER; \
_PAGE_RW = PLT##_PAGE_RW; \
_PAGE_GUARDED = PLT##_PAGE_GUARDED; \
_PAGE_COHERENT = PLT##_PAGE_COHERENT; \
_PAGE_NO_CACHE = PLT##_PAGE_NO_CACHE; \
_PAGE_WRITETHRU = PLT##_PAGE_WRITETHRU; \
_PAGE_DIRTY = PLT##_PAGE_DIRTY; \
_PAGE_ACCESSED = PLT##_PAGE_ACCESSED; \
_PAGE_HWWRITE = PLT##_PAGE_HWWRITE; \
_PAGE_SHARED = PLT##_PAGE_SHARED; \
} while (0)
static int
probe_ppc44x_platform(char *name)
{
/* 44x include ppc440* and ppc470 */
if (STRNEQ(name, "ppc440") || STREQ(name, "ppc470")) {
PPC_PLATFORM = strdup(name);
PLATFORM_PAGE_FLAGS_SETUP(PPC44x);
return TRUE;
}
return FALSE;
}
struct fsl_booke_tlbcam {
#define NUM_TLBCAMS (64)
#define LAST_TLBCAM (0x40)
uint index;
struct {
ulong start;
ulong limit;
physaddr_t phys;
} tlbcamrange;
struct {
uint MAS0;
uint MAS1;
ulong MAS2;
uint MAS3;
uint MAS7;
} tlbcam;
};
static int
fsl_booke_vtop(ulong vaddr, physaddr_t *paddr, int verbose)
{
struct fsl_booke_tlbcam *fsl_mmu;
int i, found;
if (CRASHDEBUG(1))
fprintf(fp, "[Searching tlbcam address mapping]\n");
fsl_mmu = MMU_SPECIAL;
for (i = 0, found = FALSE;;i++, fsl_mmu++) {
if (vaddr >= fsl_mmu->tlbcamrange.start &&
vaddr < fsl_mmu->tlbcamrange.limit) {
*paddr = fsl_mmu->tlbcamrange.phys +
(vaddr - fsl_mmu->tlbcamrange.start);
found = TRUE;
break;
}
if (fsl_mmu->index & LAST_TLBCAM)
break;
}
if (found && verbose) {
/* TLBCAM segment attributes */
fprintf(fp, "\n TLBCAM[%u]: MAS0 MAS1 MAS2 "
"MAS3 MAS7\n",
(fsl_mmu->index & ~LAST_TLBCAM));
fprintf(fp, " %-8x %-8x %-8lx %-8x %-8x\n",
fsl_mmu->tlbcam.MAS0, fsl_mmu->tlbcam.MAS1,
fsl_mmu->tlbcam.MAS2, fsl_mmu->tlbcam.MAS3,
fsl_mmu->tlbcam.MAS7);
/* TLBCAM range */
fprintf(fp, " VIRTUAL RANGE : %lx - %lx\n",
fsl_mmu->tlbcamrange.start, fsl_mmu->tlbcamrange.limit);
fprintf(fp, " PHYSICAL RANGE: %llx - %llx\n",
fsl_mmu->tlbcamrange.phys,
fsl_mmu->tlbcamrange.phys + (fsl_mmu->tlbcamrange.limit
- fsl_mmu->tlbcamrange.start));
/* translated addr and its tlbcam's offset. */
fprintf(fp, " => VIRTUAL PHYSICAL TLBCAM-OFFSET\n");
fprintf(fp, " %-8lx %-8llx %lu\n", vaddr, *paddr,
vaddr - fsl_mmu->tlbcamrange.start);
}
if (CRASHDEBUG(1))
fprintf(fp, "[tlbcam search end]\n");
return found;
}
static void
fsl_booke_mmu_setup(void)
{
struct fsl_booke_tlbcam *fsl_mmu;
uint i, tlbcam_index;
ulong tlbcam_addrs, TLBCAM;
readmem(symbol_value("tlbcam_index"), KVADDR, &tlbcam_index,
sizeof(uint), "tlbcam_index", FAULT_ON_ERROR);
if (tlbcam_index != 0 && tlbcam_index < NUM_TLBCAMS) {
fsl_mmu = calloc(tlbcam_index, sizeof(*fsl_mmu));
if (!fsl_mmu) {
error(FATAL, "fsl_mmu calloc() failed\n");
return;
}
tlbcam_addrs = symbol_value("tlbcam_addrs");
TLBCAM = symbol_value("TLBCAM");
for (i = 0; i < tlbcam_index; i++) {
fsl_mmu[i].index = i;
readmem(tlbcam_addrs +
i * sizeof(fsl_mmu[i].tlbcamrange),
KVADDR, &fsl_mmu[i].tlbcamrange,
sizeof(fsl_mmu[i].tlbcamrange), "tlbcam_addrs",
FAULT_ON_ERROR);
readmem(TLBCAM + i * sizeof(fsl_mmu[i].tlbcam), KVADDR,
&fsl_mmu[i].tlbcam, sizeof(fsl_mmu[i].tlbcam),
"TLBCAM", FAULT_ON_ERROR);
}
fsl_mmu[i - 1].index |= LAST_TLBCAM;
MMU_SPECIAL = fsl_mmu;
VTOP_SPECIAL = fsl_booke_vtop;
} else
error(INFO, "[%s]: can't setup tlbcam: tlbcam_index=%u\n",
PPC_PLATFORM, tlbcam_index);
}
static int
probe_ppce500_platform(char *name)
{
if (STRNEQ(name, "ppce500mc")) {
PPC_PLATFORM = strdup(name);
if (IS_PAE()) {
PTE_RPN_SHIFT = BOOKE3E_PTE_RPN_SHIFT;
PLATFORM_PAGE_FLAGS_SETUP(BOOK3E);
/* Set special flag for book3e */
_PAGE_K_RW = BOOK3E_PAGE_KERNEL_RW;
} else
PLATFORM_PAGE_FLAGS_SETUP(FSL_BOOKE);
fsl_booke_mmu_setup();
return TRUE;
}
return FALSE;
}
static int
probe_default_platform(char *name)
{
if (IS_PAE()) {
error(INFO, "platform \"%s\" 64bit PTE fall through\n", name);
error(INFO, "vmalloc translation could not work!\n");
}
/* Use the default definitions */
PPC_PLATFORM = strdup(name);
PLATFORM_PAGE_FLAGS_SETUP(DEFAULT);
return TRUE;
}
#undef PLATFORM_PAGE_FLAGS_SETUP
/*
* Find the platform of the crashing system and set the
* base_platform accordingly.
*/
void
ppc_probe_base_platform(void)
{
probe_func_t probe;
char platform_name[MAX_PLATFORM_LEN];
ulong ptr;
int i;
if(!try_get_symbol_data("powerpc_base_platform", sizeof(ulong), &ptr) ||
read_string(ptr, platform_name, MAX_PLATFORM_LEN - 1) == 0)
/* Let us fallback to default definitions */
strcpy(platform_name, "(unknown)");
for (i = 0; probe_platforms[i] != NULL; i++) {
probe = probe_platforms[i];
if (probe(platform_name))
break;
}
}
/*
* Do all necessary machine-specific setup here. This is called twice,
* before and after GDB has been initialized.
*/
void
ppc_init(int when)
{
uint cpu_features;
ulong cur_cpu_spec;
struct datatype_member pte = {
.name = "pte_t",
};
switch (when)
{
case SETUP_ENV:
machdep->machspec = &ppc_machine_specific;
machdep->process_elf_notes = process_elf32_notes;
break;
case PRE_SYMTAB:
machdep->verify_symbol = ppc_verify_symbol;
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 = PPC_STACK_SIZE;
if ((machdep->pgd = (char *)malloc(PAGESIZE())) == NULL)
error(FATAL, "cannot malloc pgd space.");
machdep->pmd = machdep->pgd;
if ((machdep->ptbl = (char *)malloc(PAGESIZE())) == NULL)
error(FATAL, "cannot malloc ptbl space.");
machdep->last_pgd_read = 0;
machdep->last_pmd_read = 0;
machdep->last_ptbl_read = 0;
machdep->verify_paddr = generic_verify_paddr;
break;
case PRE_GDB:
machdep->kvbase = symbol_value("_stext");
machdep->identity_map_base = machdep->kvbase;
machdep->is_kvaddr = generic_is_kvaddr;
machdep->is_uvaddr = generic_is_uvaddr;
machdep->eframe_search = ppc_eframe_search;
machdep->back_trace = ppc_back_trace_cmd;
machdep->processor_speed = ppc_processor_speed;
machdep->uvtop = ppc_uvtop;
machdep->kvtop = ppc_kvtop;
machdep->get_task_pgd = ppc_get_task_pgd;
machdep->get_stack_frame = ppc_get_stack_frame;
machdep->get_stackbase = generic_get_stackbase;
machdep->get_stacktop = generic_get_stacktop;
machdep->translate_pte = ppc_translate_pte;
machdep->memory_size = generic_memory_size;
machdep->is_task_addr = ppc_is_task_addr;
machdep->dis_filter = ppc_dis_filter;
machdep->cmd_mach = ppc_cmd_mach;
machdep->get_smp_cpus = ppc_get_smp_cpus;
machdep->line_number_hooks = ppc_line_number_hooks;
machdep->value_to_symbol = generic_machdep_value_to_symbol;
machdep->init_kernel_pgd = NULL;
break;
case POST_GDB:
/* gdb interface got available, resolve PTE right now. */
PTE_SIZE = DATATYPE_SIZE(&pte);
if (PTE_SIZE < 0)
error(FATAL,
"gdb could not handle \"pte_t\" size request\n");
/* Check if we have 64bit PTE on 32bit system */
if (PTE_SIZE == sizeof(ulonglong))
machdep->flags |= PAE;
/* Find the platform where we crashed */
ppc_probe_base_platform();
if (!PTE_RPN_SHIFT)
PTE_RPN_SHIFT = PAGE_SHIFT;
machdep->vmalloc_start = ppc_vmalloc_start;
MEMBER_OFFSET_INIT(thread_struct_pg_tables,
"thread_struct", "pg_tables");
if (VALID_SIZE(irq_desc_t)) {
/*
* Use generic irq handlers for recent kernels whose
* irq_desc_t have been initialized in kernel_init().
*/
machdep->dump_irq = generic_dump_irq;
machdep->show_interrupts = generic_show_interrupts;
machdep->get_irq_affinity = generic_get_irq_affinity;
} else {
machdep->dump_irq = ppc_dump_irq;
STRUCT_SIZE_INIT(irqdesc, "irqdesc");
STRUCT_SIZE_INIT(irq_desc_t, "irq_desc_t");
MEMBER_OFFSET_INIT(irqdesc_action, "irqdesc", "action");
MEMBER_OFFSET_INIT(irqdesc_ctl, "irqdesc", "ctl");
MEMBER_OFFSET_INIT(irqdesc_level, "irqdesc", "level");
}
MEMBER_OFFSET_INIT(device_node_type, "device_node", "type");
MEMBER_OFFSET_INIT(device_node_allnext,
"device_node", "allnext");
MEMBER_OFFSET_INIT(device_node_properties,
"device_node", "properties");
MEMBER_OFFSET_INIT(property_name, "property", "name");
MEMBER_OFFSET_INIT(property_value, "property", "value");
MEMBER_OFFSET_INIT(property_next, "property", "next");
MEMBER_OFFSET_INIT(machdep_calls_setup_residual,
"machdep_calls", "setup_residual");
MEMBER_OFFSET_INIT(RESIDUAL_VitalProductData,
"RESIDUAL", "VitalProductData");
MEMBER_OFFSET_INIT(VPD_ProcessorHz, "VPD", "ProcessorHz");
MEMBER_OFFSET_INIT(bd_info_bi_intfreq, "bd_info", "bi_intfreq");
if (symbol_exists("irq_desc"))
ARRAY_LENGTH_INIT(machdep->nr_irqs, irq_desc,
"irq_desc", NULL, 0);
else if (symbol_exists("nr_irqs"))
get_symbol_data("nr_irqs", sizeof(int),
&machdep->nr_irqs);
else
machdep->nr_irqs = 512; /* NR_IRQS (at least) */
if (!machdep->hz) {
machdep->hz = HZ;
if (THIS_KERNEL_VERSION >= LINUX(2,6,0))
machdep->hz = 1000;
}
if (symbol_exists("cur_cpu_spec")) {
get_symbol_data("cur_cpu_spec", sizeof(void *), &cur_cpu_spec);
readmem(cur_cpu_spec + MEMBER_OFFSET("cpu_spec", "cpu_user_features"),
KVADDR, &cpu_features, sizeof(uint), "cpu user features",
FAULT_ON_ERROR);
if (cpu_features & CPU_BOOKE)
machdep->flags |= CPU_BOOKE;
}
else
machdep->flags |= CPU_BOOKE;
machdep->section_size_bits = _SECTION_SIZE_BITS;
machdep->max_physmem_bits = _MAX_PHYSMEM_BITS;
/*
* IRQ stacks are introduced in 2.6 and also configurable.
*/
if ((THIS_KERNEL_VERSION >= LINUX(2,6,0)) &&
symbol_exists("hardirq_ctx"))
STRUCT_SIZE_INIT(irq_ctx, "hardirq_ctx");
STRUCT_SIZE_INIT(note_buf, "note_buf_t");
STRUCT_SIZE_INIT(elf_prstatus, "elf_prstatus");
break;
case POST_INIT:
break;
case LOG_ONLY:
machdep->kvbase = kt->vmcoreinfo._stext_SYMBOL;
break;
}
}
void
ppc_dump_machdep_table(ulong arg)
{
int others;
others = 0;
fprintf(fp, " platform: %s\n", PPC_PLATFORM);
fprintf(fp, " flags: %lx (", machdep->flags);
if (machdep->flags & KSYMS_START)
fprintf(fp, "%sKSYMS_START", others++ ? "|" : "");
if (machdep->flags & PAE)
fprintf(fp, "%sPAE", others++ ? "|" : "");
if (machdep->flags & CPU_BOOKE)
fprintf(fp, "%sCPU_BOOKE", 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: %d\n", PGDIR_SHIFT);
fprintf(fp, " ptrs_per_pgd: %d\n", PTRS_PER_PGD);
fprintf(fp, " ptrs_per_pte: %d\n", PTRS_PER_PTE);
fprintf(fp, " pte_size: %d\n", PTE_SIZE);
fprintf(fp, " pte_rpn_shift: %d\n", PTE_RPN_SHIFT);
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: ppc_eframe_search() [TBD]\n");
fprintf(fp, " back_trace: ppc_back_trace_cmd()\n");
fprintf(fp, " processor_speed: ppc_processor_speed()\n");
fprintf(fp, " uvtop: ppc_uvtop()\n");
fprintf(fp, " kvtop: ppc_kvtop()\n");
fprintf(fp, " get_task_pgd: ppc_get_task_pgd()\n");
if (machdep->dump_irq == generic_dump_irq)
fprintf(fp, " dump_irq: generic_dump_irq()\n");
else
fprintf(fp, " dump_irq: ppc_dump_irq()\n");
fprintf(fp, " show_interrupts: generic_show_interrupts()\n");
fprintf(fp, " get_irq_affinity: generic_get_irq_affinity()\n");
fprintf(fp, " get_stack_frame: ppc_get_stack_frame()\n");
fprintf(fp, " get_stackbase: generic_get_stackbase()\n");
fprintf(fp, " get_stacktop: generic_get_stacktop()\n");
fprintf(fp, " translate_pte: ppc_translate_pte()\n");
fprintf(fp, " memory_size: generic_memory_size()\n");
fprintf(fp, " vmalloc_start: ppc_vmalloc_start()\n");
fprintf(fp, " is_task_addr: ppc_is_task_addr()\n");
fprintf(fp, " verify_symbol: ppc_verify_symbol()\n");
fprintf(fp, " dis_filter: ppc_dis_filter()\n");
fprintf(fp, " cmd_mach: ppc_cmd_mach()\n");
fprintf(fp, " get_smp_cpus: ppc_get_smp_cpus()\n");
fprintf(fp, " is_kvaddr: generic_is_kvaddr()\n");
fprintf(fp, " is_uvaddr: generic_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: ppc_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, " pgd: %lx\n", (ulong)machdep->pgd);
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 ulonglong
ppc_pte_physaddr(ulonglong pte)
{
pte = pte >> PTE_RPN_SHIFT; /* pfn */
pte = pte << PAGE_SHIFT; /* physaddr */
return pte;
}
static int
ppc_pgd_vtop(ulong *pgd, ulong vaddr, physaddr_t *paddr, int verbose)
{
ulong *page_dir;
ulong pgd_pte, page_table, pte_index;
ulonglong pte;
if (verbose)
fprintf(fp, "PAGE DIRECTORY: %lx\n", (ulong)pgd);
page_dir = pgd + (vaddr >> PGDIR_SHIFT);
/*
* Size of a pgd could be more than a PAGE.
* So use PAGEBASE(page_dir), instead of
* PAGEBASE(pgd) for FILL_PGD()
*/
FILL_PGD(PAGEBASE((ulong)page_dir), KVADDR, PAGESIZE());
pgd_pte = ULONG(machdep->pgd + PAGEOFFSET((ulong)page_dir));
if (verbose)
fprintf(fp, " PGD: %lx => %lx\n", (ulong)page_dir, pgd_pte);
if (!pgd_pte) {
if (VTOP_SPECIAL)
/*
* This ppc platform have special address mapping
* between vaddr and paddr which can not search from
* standard page table.
*/
return VTOP_SPECIAL(vaddr, paddr, verbose);
goto no_page;
}
page_table = pgd_pte;
if (IS_BOOKE())
page_table = VTOP(page_table);
FILL_PTBL(PAGEBASE((ulong)page_table), PHYSADDR, PAGESIZE());
pte_index = (vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
if (IS_PAE())
pte = ULONGLONG(machdep->ptbl + PTE_SIZE * pte_index);
else
pte = ULONG(machdep->ptbl + PTE_SIZE * pte_index);
if (verbose)
fprintf(fp, " PTE: %lx => %llx\n", pgd_pte, pte);
if (!(pte & _PAGE_PRESENT)) {
if (pte && verbose) {
fprintf(fp, "\n");
ppc_translate_pte((ulong)pte, 0, pte);
}
goto no_page;
}
if (verbose) {
fprintf(fp, " PAGE: %llx\n\n", PAGEBASE(ppc_pte_physaddr(pte)));
ppc_translate_pte((ulong)pte, 0, pte);
}
*paddr = PAGEBASE(ppc_pte_physaddr(pte)) + PAGEOFFSET(vaddr);
return TRUE;
no_page:
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.
*
* This routine can also take mapped kernel virtual addresses if the -u flag
* was passed to cmd_vtop(). If so, it makes the translation using the
* kernel-memory PGD entry instead of swapper_pg_dir.
*/
static int
ppc_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)) {
if (VALID_MEMBER(thread_struct_pg_tables))
pgd = (ulong *)machdep->get_task_pgd(tc->task);
else {
if (INVALID_MEMBER(task_struct_active_mm))
error(FATAL, "no pg_tables or active_mm?\n");
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 ppc_pgd_vtop(pgd, vaddr, paddr, verbose);
}
/*
* Translates a kernel 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
ppc_kvtop(struct task_context *tc, ulong kvaddr, physaddr_t *paddr, int verbose)
{
ulong *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;
}
pgd = (ulong *)vt->kernel_pgd[0];
return ppc_pgd_vtop(pgd, kvaddr, paddr, verbose);
}
/*
* Determine where vmalloc'd memory starts by looking at the first
* entry on the vmlist.
*/
static ulong
ppc_vmalloc_start(void)
{
return (first_vmalloc_address());
}
/*
* PPC tasks are all stacksize-aligned, except when split from the stack.
* PPC also allows the idle_task to be non-page aligned, so we have to make
* an additional check through the idle_threads array.
*/
static int
ppc_is_task_addr(ulong task)
{
int i;
if (tt->flags & THREAD_INFO)
return IS_KVADDR(task);
else if (IS_KVADDR(task) && (ALIGNED_STACK_OFFSET(task) == 0))
return TRUE;
for (i = 0; i < kt->cpus; i++)
if (task == tt->idle_threads[i])
return TRUE;
return FALSE;
}
/*
* According to kernel source, this should cover all the PPC variants out
* There, but since we can't test them all, YMMV.
*/
static ulong
ppc_processor_speed(void)
{
ulong res, value, ppc_md, md_setup_res;
ulong prep_setup_res;
ulong node, type, name, properties;
char str_buf[32];
ulong len, mhz = 0;
if (machdep->mhz)
return(machdep->mhz);
if(symbol_exists("allnodes")) {
get_symbol_data("allnodes", sizeof(void *), &node);
while(node) {
readmem(node+OFFSET(device_node_type),
KVADDR, &type, sizeof(ulong), "node type",
FAULT_ON_ERROR);
if(type != 0) {
len = read_string(type, str_buf,
sizeof(str_buf));
if(len && (strcasecmp(str_buf, "cpu") == 0))
break;
}
readmem(node+OFFSET(device_node_allnext),
KVADDR, &node, sizeof(ulong), "node allnext",
FAULT_ON_ERROR);
}
/* now, if we found a CPU node, get the speed property */
if(node) {
readmem(node+OFFSET(device_node_properties),
KVADDR, &properties, sizeof(ulong),
"node properties", FAULT_ON_ERROR);
while(properties) {
readmem(properties+OFFSET(property_name),
KVADDR, &name,
sizeof(ulong), "property name",
FAULT_ON_ERROR);
len = read_string(name, str_buf,
sizeof(str_buf));
if (len && (strcasecmp(str_buf,
"clock-frequency") == 0)) {
/* found the right cpu property */
readmem(properties+
OFFSET(property_value),
KVADDR, &value, sizeof(ulong),
"clock freqency pointer",
FAULT_ON_ERROR);
readmem(value, KVADDR, &mhz,
sizeof(ulong),
"clock frequency value",
FAULT_ON_ERROR);
mhz /= 1000000;
break;
} else if(len && (strcasecmp(str_buf,
"ibm,extended-clock-frequency") == 0)){
/* found the right cpu property */
readmem(properties+
OFFSET(property_value),
KVADDR, &value, sizeof(ulong),
"clock freqency pointer",
FAULT_ON_ERROR);
readmem(value, KVADDR, &mhz,
sizeof(ulong),
"clock frequency value",
FAULT_ON_ERROR);
mhz /= 1000000;
break;
}
/* keep looking */
readmem(properties+
OFFSET(property_next),
KVADDR, &properties, sizeof(ulong),
"property next", FAULT_ON_ERROR);
}
if(!properties) {
/* didn't find the cpu speed for some reason */
return (machdep->mhz = 0);
}
}
}
/* for machines w/o OF */
/* untested, but in theory this should work on prep machines */
if (symbol_exists("res") && !mhz) {
get_symbol_data("res", sizeof(void *), &res);
if (symbol_exists("prep_setup_residual")) {
get_symbol_data("prep_setup_residual",
sizeof(void *), &prep_setup_res);
get_symbol_data("ppc_md", sizeof(void *),
&ppc_md);
readmem(ppc_md +
OFFSET(machdep_calls_setup_residual),
KVADDR, &md_setup_res,
sizeof(ulong), "ppc_md setup_residual",
FAULT_ON_ERROR);
if(prep_setup_res == md_setup_res) {
/* PREP machine */
readmem(res+
OFFSET(RESIDUAL_VitalProductData)+
OFFSET(VPD_ProcessorHz),
KVADDR, &mhz, sizeof(ulong),
"res VitalProductData",
FAULT_ON_ERROR);
mhz = (mhz > 1024) ? mhz >> 20 : mhz;
}
}
if(!mhz) {
/* everything else seems to do this the same way... */
readmem(res +
OFFSET(bd_info_bi_intfreq),
KVADDR, &mhz, sizeof(ulong),
"bd_info bi_intfreq", FAULT_ON_ERROR);
mhz /= 1000000;
}
}
/* else...well, we don't have OF, or a residual structure, so
* just print unknown MHz
*/
return (machdep->mhz = mhz);
}
/*
* Accept or reject a symbol from the kernel namelist.
*/
static int
ppc_verify_symbol(const char *name, ulong value, char type)
{
if (CRASHDEBUG(8) && name && strlen(name))
fprintf(fp, "%08lx %s\n", value, name);
if (STREQ(name, "_start"))
machdep->flags |= KSYMS_START;
return (name && strlen(name) && (machdep->flags & KSYMS_START) &&
!STREQ(name, "Letext") && !STRNEQ(name, "__func__."));
}
/*
* Get the relevant page directory pointer from a task structure.
*/
static ulong
ppc_get_task_pgd(ulong task)
{
long offset;
ulong pg_tables;
offset = VALID_MEMBER(task_struct_thread) ?
OFFSET(task_struct_thread) : OFFSET(task_struct_tss);
if (INVALID_MEMBER(thread_struct_pg_tables))
error(FATAL,
"pg_tables does not exist in this kernel's thread_struct\n");
offset += OFFSET(thread_struct_pg_tables);
readmem(task + offset, KVADDR, &pg_tables,
sizeof(ulong), "task thread pg_tables", FAULT_ON_ERROR);
return(pg_tables);
}
/*
* Translate a PTE, returning TRUE if the page is _PAGE_PRESENT.
* If a physaddr pointer is passed in, don't print anything.
*/
static int
ppc_translate_pte(ulong pte32, void *physaddr, ulonglong pte64)
{
int c, len1, len2, len3, others, page_present;
char buf[BUFSIZE];
char buf2[BUFSIZE];
char buf3[BUFSIZE];
char ptebuf[BUFSIZE];
char physbuf[BUFSIZE];
char *arglist[MAXARGS];
ulonglong paddr;
if (!IS_PAE())
pte64 = pte32;
paddr = PAGEBASE(ppc_pte_physaddr(pte64));
page_present = (pte64 & _PAGE_PRESENT);
if (physaddr) {
*((ulong *)physaddr) = paddr;
return page_present;
}
sprintf(ptebuf, "%llx", pte64);
len1 = MAX(strlen(ptebuf), strlen("PTE"));
fprintf(fp, "%s ", mkstring(buf, len1, CENTER|LJUST, "PTE"));
if (!page_present && pte64) {
swap_location(pte64, buf);
if ((c = parse_line(buf, arglist)) != 3)
error(FATAL, "cannot determine swap location\n");
len2 = MAX(strlen(arglist[0]), strlen("SWAP"));
len3 = MAX(strlen(arglist[2]), strlen("OFFSET"));
fprintf(fp, "%s %s\n",
mkstring(buf2, len2, CENTER|LJUST, "SWAP"),
mkstring(buf3, len3, CENTER|LJUST, "OFFSET"));
strcpy(buf2, arglist[0]);
strcpy(buf3, arglist[2]);
fprintf(fp, "%s %s %s\n",
mkstring(ptebuf, len1, CENTER|RJUST, NULL),
mkstring(buf2, len2, CENTER|RJUST, NULL),
mkstring(buf3, len3, CENTER|RJUST, NULL));
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 (pte64) {
if (_PAGE_PRESENT &&
(pte64 & _PAGE_PRESENT) == _PAGE_PRESENT)
fprintf(fp, "%sPRESENT", others++ ? "|" : "");
if (_PAGE_USER &&
(pte64 & _PAGE_USER) == _PAGE_USER)
fprintf(fp, "%sUSER", others++ ? "|" : "");
if (_PAGE_RW &&
(pte64 & _PAGE_RW) == _PAGE_RW)
fprintf(fp, "%sRW", others++ ? "|" : "");
if (_PAGE_K_RW &&
((pte64 & _PAGE_K_RW) == _PAGE_K_RW))
fprintf(fp, "%sK-RW", others++ ? "|" : "");
if (_PAGE_GUARDED &&
(pte64 & _PAGE_GUARDED) == _PAGE_GUARDED)
fprintf(fp, "%sGUARDED", others++ ? "|" : "");
if (_PAGE_COHERENT &&
(pte64 & _PAGE_COHERENT) == _PAGE_COHERENT)
fprintf(fp, "%sCOHERENT", others++ ? "|" : "");
if (_PAGE_NO_CACHE &&
(pte64 & _PAGE_NO_CACHE) == _PAGE_NO_CACHE)
fprintf(fp, "%sNO_CACHE", others++ ? "|" : "");
if (_PAGE_WRITETHRU &&
(pte64 & _PAGE_WRITETHRU) == _PAGE_WRITETHRU)
fprintf(fp, "%sWRITETHRU", others++ ? "|" : "");
if (_PAGE_DIRTY &&
(pte64 & _PAGE_DIRTY) == _PAGE_DIRTY)
fprintf(fp, "%sDIRTY", others++ ? "|" : "");
if (_PAGE_ACCESSED &&
(pte64 & _PAGE_ACCESSED) == _PAGE_ACCESSED)
fprintf(fp, "%sACCESSED", others++ ? "|" : "");
if (_PAGE_HWWRITE &&
(pte64 & _PAGE_HWWRITE) == _PAGE_HWWRITE)
fprintf(fp, "%sHWWRITE", others++ ? "|" : "");
} else
fprintf(fp, "no mapping");
fprintf(fp, ")\n");
return page_present;
}
/*
* Look for likely exception frames in a stack.