/* s390.c - core analysis suite
*
* Copyright (C) 2001, 2002 Mission Critical Linux, Inc.
* Copyright (C) 2002-2006, 2009-2014 David Anderson
* Copyright (C) 2002-2006, 2009-2014 Red Hat, Inc. All rights reserved.
* Copyright (C) 2005, 2006, 2010-2013 Michael Holzheu, IBM Corporation
*
* 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 S390X
#include <elf.h>
#include "defs.h"
#include "netdump.h"
#define S390X_WORD_SIZE 8
#define S390X_PAGE_BASE_MASK (~((1ULL<<12)-1))
/* Flags used in entries of page dirs and page tables.
*/
#define S390X_PTE_FLAG_BITS 0xfffULL /* Page table entry flag bits */
#define S390X_PAGE_PRESENT 0x001ULL /* set: loaded in physical memory
* clear: not loaded in physical mem */
#define S390X_PAGE_RO 0x200ULL /* HW read-only */
#define S390X_PAGE_INVALID 0x400ULL /* HW invalid */
#define S390X_PAGE_INVALID_MASK 0x601ULL /* for linux 2.6 */
#define S390X_PAGE_INVALID_NONE 0x401ULL /* for linux 2.6 */
/* bits 52, 55 must contain zeroes in a pte */
#define S390X_PTE_INVALID_MASK 0x900ULL
#define S390X_PTE_INVALID(x) ((x) & S390X_PTE_INVALID_MASK)
#define INT_STACK_SIZE STACKSIZE() // can be 8192 or 16384
#define KERNEL_STACK_SIZE STACKSIZE() // can be 8192 or 16384
#define LOWCORE_SIZE 8192
#define VX_SA_SIZE (32 * 16)
#define S390X_PSW_MASK_PSTATE 0x0001000000000000UL
#define S390X_LC_VMCORE_INFO 0xe0c
/*
* Flags for Region and Segment table entries.
*/
#define S390X_RTE_FLAG_BITS_FC0 0xfffULL
#define S390X_RTE_FLAG_BITS_FC1 0x7fffffffULL
#define S390X_RTE_TL 0x3ULL
#define S390X_RTE_TL_10 0x2ULL
#define S390X_RTE_TL_01 0x1ULL
#define S390X_RTE_TT 0xcULL
#define S390X_RTE_TT_10 0x8ULL
#define S390X_RTE_TT_01 0x4ULL
#define S390X_RTE_CR 0x10ULL
#define S390X_RTE_I 0x20ULL
#define S390X_RTE_TF 0xc0ULL
#define S390X_RTE_TF_10 0x80ULL
#define S390X_RTE_TF_01 0x40ULL
#define S390X_RTE_P 0x200ULL
#define S390X_RTE_FC 0x400ULL
#define S390X_RTE_F 0x800ULL
#define S390X_RTE_ACC 0xf000ULL
#define S390X_RTE_ACC_1000 0x8000ULL
#define S390X_RTE_ACC_0100 0x4000ULL
#define S390X_RTE_ACC_0010 0x2000ULL
#define S390X_RTE_ACC_0001 0x1000ULL
#define S390X_RTE_AV 0x10000ULL
#define S390X_STE_FLAG_BITS_FC0 0x7ffULL
#define S390X_STE_FLAG_BITS_FC1 0xfffffULL
#define S390X_STE_TT 0xcULL
#define S390X_STE_TT_10 0x8ULL
#define S390X_STE_TT_01 0x4ULL
#define S390X_STE_CS 0x10ULL
#define S390X_STE_I 0x20ULL
#define S390X_STE_P 0x200ULL
#define S390X_STE_FC 0x400ULL
#define S390X_STE_F 0x800ULL
#define S390X_STE_ACC 0xf000ULL
#define S390X_STE_ACC_1000 0x8000ULL
#define S390X_STE_ACC_0100 0x4000ULL
#define S390X_STE_ACC_0010 0x2000ULL
#define S390X_STE_ACC_0001 0x1000ULL
#define S390X_STE_AV 0x10000ULL
/*
* S390x prstatus ELF Note
*/
struct s390x_nt_prstatus {
uint8_t pad1[32];
uint32_t pr_pid;
uint8_t pad2[76];
uint64_t psw[2];
uint64_t gprs[16];
uint32_t acrs[16];
uint64_t orig_gpr2;
uint32_t pr_fpvalid;
uint8_t pad3[4];
} __attribute__ ((packed));
/*
* S390x floating point register ELF Note
*/
#ifndef NT_FPREGSET
#define NT_FPREGSET 0x2
#endif
struct s390x_nt_fpregset {
uint32_t fpc;
uint32_t pad;
uint64_t fprs[16];
} __attribute__ ((packed));
struct s390x_vxrs {
uint64_t low;
uint64_t high;
} __attribute__ ((packed));
/*
* s390x CPU info
*/
struct s390x_cpu
{
uint64_t gprs[16];
uint64_t ctrs[16];
uint32_t acrs[16];
uint64_t fprs[16];
uint32_t fpc;
uint64_t psw[2];
uint32_t prefix;
uint64_t timer;
uint64_t todcmp;
uint32_t todpreg;
uint64_t vxrs_low[16];
struct s390x_vxrs vxrs_high[16];
};
/*
* declarations of static functions
*/
static void s390x_print_lowcore(char*, struct bt_info*,int);
static int s390x_kvtop(struct task_context *, ulong, physaddr_t *, int);
static int s390x_uvtop(struct task_context *, ulong, physaddr_t *, int);
static int s390x_vtop(unsigned long, ulong, physaddr_t*, int);
static ulong s390x_vmalloc_start(void);
static int s390x_is_task_addr(ulong);
static int s390x_verify_symbol(const char *, ulong, char type);
static ulong s390x_get_task_pgd(ulong);
static int s390x_translate_pte(ulong, void *, ulonglong);
static ulong s390x_processor_speed(void);
static int s390x_eframe_search(struct bt_info *);
static void s390x_back_trace_cmd(struct bt_info *);
static void s390x_get_stack_frame(struct bt_info *, ulong *, ulong *);
static int s390x_dis_filter(ulong, char *, unsigned int);
static void s390x_cmd_mach(void);
static int s390x_get_smp_cpus(void);
static void s390x_display_machine_stats(void);
static void s390x_dump_line_number(ulong);
static struct line_number_hook s390x_line_number_hooks[];
static int s390x_is_uvaddr(ulong, struct task_context *);
static int s390x_get_kvaddr_ranges(struct vaddr_range *);
static int set_s390x_max_physmem_bits(void);
/*
* struct lowcore name (old: "_lowcore", new: "lowcore")
*/
static char *lc_struct;
/*
* Read a unsigned long value from address
*/
static unsigned long readmem_ul(unsigned long addr)
{
unsigned long rc;
readmem(addr, KVADDR, &rc, sizeof(rc), "readmem_ul", FAULT_ON_ERROR);
return rc;
}
/*
* Print hex data
*/
static void print_hex_buf(void *buf, int len, int cols, char *tag)
{
int j, first = 1;
for (j = 0; j < len; j += 8) {
if (j % (cols * 8) == 0) {
if (first)
first = 0;
else
fprintf(fp, "\n");
fprintf(fp, "%s", tag);
}
fprintf(fp, "%#018lx ", *((unsigned long *)(buf + j)));
}
if (len)
fprintf(fp, "\n");
}
/*
* Initialize member offsets
*/
static void s390x_offsets_init(void)
{
if (STRUCT_EXISTS("lowcore"))
lc_struct = "lowcore";
else
lc_struct = "_lowcore";
if (MEMBER_EXISTS(lc_struct, "st_status_fixed_logout"))
MEMBER_OFFSET_INIT(s390_lowcore_psw_save_area, lc_struct,
"st_status_fixed_logout");
else
MEMBER_OFFSET_INIT(s390_lowcore_psw_save_area, lc_struct,
"psw_save_area");
if (!STRUCT_EXISTS("stack_frame")) {
ASSIGN_OFFSET(s390_stack_frame_back_chain) = 0;
ASSIGN_OFFSET(s390_stack_frame_r14) = 112;
ASSIGN_SIZE(s390_stack_frame) = 160;
} else {
ASSIGN_OFFSET(s390_stack_frame_back_chain) =
MEMBER_OFFSET("stack_frame", "back_chain");
ASSIGN_OFFSET(s390_stack_frame_r14) =
MEMBER_OFFSET("stack_frame", "gprs") + 8 * 8;
ASSIGN_SIZE(s390_stack_frame) = STRUCT_SIZE("stack_frame");
}
}
/*
* MAX_PHYSMEM_BITS is 42 on older kernels, and 46 on newer kernels.
*/
static int
set_s390x_max_physmem_bits(void)
{
int array_len, dimension;
char *string;
if ((string = pc->read_vmcoreinfo("NUMBER(MAX_PHYSMEM_BITS)"))) {
machdep->max_physmem_bits = atol(string);
free(string);
return TRUE;
}
machdep->max_physmem_bits = _MAX_PHYSMEM_BITS_OLD;
if (!kernel_symbol_exists("mem_section"))
return TRUE;
/*
* The mem_section was changed to be a pointer in 4.15, so it's
* guaranteed to be a newer kernel.
*/
if (get_symbol_type("mem_section", NULL, NULL) == TYPE_CODE_PTR) {
machdep->max_physmem_bits = _MAX_PHYSMEM_BITS_NEW;
return TRUE;
}
if (!(array_len = get_array_length("mem_section", &dimension, 0)))
return FALSE;
/*
* !CONFIG_SPARSEMEM_EXTREME
*/
if (dimension) {
machdep->max_physmem_bits = _MAX_PHYSMEM_BITS_OLD;
if (array_len == (NR_MEM_SECTIONS() / _SECTIONS_PER_ROOT()))
return TRUE;
machdep->max_physmem_bits = _MAX_PHYSMEM_BITS_NEW;
if (array_len == (NR_MEM_SECTIONS() / _SECTIONS_PER_ROOT()))
return TRUE;
return FALSE;
}
/*
* CONFIG_SPARSEMEM_EXTREME
*/
machdep->max_physmem_bits = _MAX_PHYSMEM_BITS_OLD;
if (array_len == (NR_MEM_SECTIONS() / _SECTIONS_PER_ROOT_EXTREME()))
return TRUE;
machdep->max_physmem_bits = _MAX_PHYSMEM_BITS_NEW;
if (array_len == (NR_MEM_SECTIONS() / _SECTIONS_PER_ROOT_EXTREME()))
return TRUE;
return FALSE;
}
static struct s390x_cpu *s390x_cpu_vec;
static int s390x_cpu_cnt;
/*
* Return s390x CPU data for backtrace
*/
static struct s390x_cpu *s390x_cpu_get(struct bt_info *bt)
{
unsigned int cpu = bt->tc->processor;
unsigned long lowcore_ptr, prefix;
unsigned int i;
lowcore_ptr = symbol_value("lowcore_ptr");
readmem(lowcore_ptr + cpu * sizeof(long), KVADDR,
&prefix, sizeof(long), "lowcore_ptr", FAULT_ON_ERROR);
for (i = 0; i < s390x_cpu_cnt; i++) {
if (s390x_cpu_vec[i].prefix == prefix)
return &s390x_cpu_vec[i];
}
error(FATAL, "cannot determine CPU for task: %lx\n", bt->task);
return NULL;
}
/*
* ELF core dump fuctions for storing CPU data
*/
static void s390x_elf_nt_prstatus_add(struct s390x_cpu *cpu,
struct s390x_nt_prstatus *prstatus)
{
memcpy(&cpu->psw, &prstatus->psw, sizeof(cpu->psw));
memcpy(&cpu->gprs, &prstatus->gprs, sizeof(cpu->gprs));
memcpy(&cpu->acrs, &prstatus->acrs, sizeof(cpu->acrs));
}
static void s390x_elf_nt_fpregset_add(struct s390x_cpu *cpu,
struct s390x_nt_fpregset *fpregset)
{
memcpy(&cpu->fpc, &fpregset->fpc, sizeof(cpu->fpc));
memcpy(&cpu->fprs, &fpregset->fprs, sizeof(cpu->fprs));
}
static void s390x_elf_nt_timer_add(struct s390x_cpu *cpu, void *desc)
{
memcpy(&cpu->timer, desc, sizeof(cpu->timer));
}
static void s390x_elf_nt_todcmp_add(struct s390x_cpu *cpu, void *desc)
{
memcpy(&cpu->todcmp, desc, sizeof(cpu->todcmp));
}
static void s390x_elf_nt_todpreg_add(struct s390x_cpu *cpu, void *desc)
{
memcpy(&cpu->todpreg, desc, sizeof(cpu->todpreg));
}
static void s390x_elf_nt_ctrs_add(struct s390x_cpu *cpu, void *desc)
{
memcpy(&cpu->ctrs, desc, sizeof(cpu->ctrs));
}
static void s390x_elf_nt_prefix_add(struct s390x_cpu *cpu, void *desc)
{
memcpy(&cpu->prefix, desc, sizeof(cpu->prefix));
}
static void s390x_elf_nt_vxrs_low_add(struct s390x_cpu *cpu, void *desc)
{
memcpy(&cpu->vxrs_low, desc, sizeof(cpu->vxrs_low));
}
static void s390x_elf_nt_vxrs_high_add(struct s390x_cpu *cpu, void *desc)
{
memcpy(&cpu->vxrs_high, desc, sizeof(cpu->vxrs_high));
}
static void *get_elf_note_desc(Elf64_Nhdr *note)
{
void *ptr = note;
return ptr + roundup(sizeof(*note) + note->n_namesz, 4);
}
static void s390x_elf_note_add(int elf_cpu_nr, void *note_ptr)
{
Elf64_Nhdr *note = note_ptr;
struct s390x_cpu *cpu;
void *desc;
desc = get_elf_note_desc(note);
if (elf_cpu_nr != s390x_cpu_cnt) {
s390x_cpu_cnt++;
s390x_cpu_vec = realloc(s390x_cpu_vec,
s390x_cpu_cnt * sizeof(*s390x_cpu_vec));
if (!s390x_cpu_vec)
error(FATAL, "cannot malloc cpu space.");
}
cpu = &s390x_cpu_vec[s390x_cpu_cnt - 1];
switch (note->n_type) {
case NT_PRSTATUS:
s390x_elf_nt_prstatus_add(cpu, desc);
break;
case NT_FPREGSET:
s390x_elf_nt_fpregset_add(cpu, desc);
break;
case NT_S390_TIMER:
s390x_elf_nt_timer_add(cpu, desc);
break;
case NT_S390_TODCMP:
s390x_elf_nt_todcmp_add(cpu, desc);
break;
case NT_S390_TODPREG:
s390x_elf_nt_todpreg_add(cpu, desc);
break;
case NT_S390_CTRS:
s390x_elf_nt_ctrs_add(cpu, desc);
break;
case NT_S390_PREFIX:
s390x_elf_nt_prefix_add(cpu, desc);
break;
case NT_S390_VXRS_LOW:
s390x_elf_nt_vxrs_low_add(cpu, desc);
break;
case NT_S390_VXRS_HIGH:
s390x_elf_nt_vxrs_high_add(cpu, desc);
break;
}
}
static void s390x_process_elf_notes(void *note_ptr, unsigned long size_note)
{
Elf64_Nhdr *note = NULL;
size_t tot, len;
static int num_prstatus_notes = 0;
for (tot = 0; tot < size_note; tot += len) {
note = note_ptr + tot;
if (note->n_type == NT_PRSTATUS)
num_prstatus_notes++;
machdep->dumpfile_init(num_prstatus_notes, note);
len = sizeof(Elf64_Nhdr);
len = roundup(len + note->n_namesz, 4);
len = roundup(len + note->n_descsz, 4);
}
}
static void s390x_check_live(void)
{
unsigned long long live_magic;
readmem(0, KVADDR, &live_magic, sizeof(live_magic), "live_magic",
RETURN_ON_ERROR | QUIET);
if (live_magic == 0x4c49564544554d50ULL)
pc->flags2 |= LIVE_DUMP;
}
static char *
vmcoreinfo_read_string_s390x(const char *vmcoreinfo, const char *key)
{
char *value_string = NULL;
size_t value_length;
char keybuf[128];
char *p1, *p2;
sprintf(keybuf, "%s=", key);
if ((p1 = strstr(vmcoreinfo, keybuf))) {
p2 = p1 + strlen(keybuf);
p1 = strstr(p2, "\n");
value_length = p1-p2;
value_string = calloc(value_length + 1, sizeof(char));
strncpy(value_string, p2, value_length);
value_string[value_length] = NULLCHAR;
}
return value_string;
}
/*
* Check the value in well-known lowcore location and process it as either
* an explicit KASLR offset (early dump case) or as vmcoreinfo pointer to
* read the relocated _stext symbol value (important for s390 and lkcd dump
* formats).
*/
static void s390x_check_kaslr(void)
{
char *_stext_string, *vmcoreinfo;
Elf64_Nhdr note;
char str[128];
ulong addr;
/* Read the value from well-known lowcore location*/
if (!readmem(S390X_LC_VMCORE_INFO, PHYSADDR, &addr,
sizeof(addr), "s390x vmcoreinfo ptr",
QUIET|RETURN_ON_ERROR))
return;
if (addr == 0)
return;
/* Check for explicit kaslr offset flag */
if (addr & 0x1UL) {
/* Drop the last bit to get an offset value */
addr &= ~(0x1UL);
/* Make sure the offset is aligned by 0x1000 */
if (addr && !(addr & 0xfff)) {
kt->relocate = addr * (-1);
kt->flags |= RELOC_SET;
kt->flags2 |= KASLR;
}
return;
}
/* Use the addr value as vmcoreinfo pointer */
if (!readmem(addr, PHYSADDR, ¬e,
sizeof(note), "Elf64_Nhdr vmcoreinfo",
QUIET|RETURN_ON_ERROR))
return;
memset(str, 0, sizeof(str));
if (!readmem(addr + sizeof(note), PHYSADDR, str,
note.n_namesz, "VMCOREINFO",
QUIET|RETURN_ON_ERROR))
return;
if (memcmp(str, "VMCOREINFO", sizeof("VMCOREINFO")) != 0)
return;
if ((vmcoreinfo = malloc(note.n_descsz + 1)) == NULL) {
error(INFO, "s390x_check_kaslr: cannot malloc vmcoreinfo buffer\n");
return;
}
addr = addr + sizeof(note) + note.n_namesz + 1;
if (!readmem(addr, PHYSADDR, vmcoreinfo,
note.n_descsz, "s390x vmcoreinfo",
QUIET|RETURN_ON_ERROR)) {
free(vmcoreinfo);
return;
}
vmcoreinfo[note.n_descsz] = NULLCHAR;
/*
* Read relocated _stext symbol value and store it in the kernel_table
* for further processing within derive_kaslr_offset().
*/
if ((_stext_string = vmcoreinfo_read_string_s390x(vmcoreinfo,
"SYMBOL(_stext)"))) {
kt->vmcoreinfo._stext_SYMBOL = htol(_stext_string,
RETURN_ON_ERROR, NULL);
free(_stext_string);
}
free(vmcoreinfo);
}
/*
* Do all necessary machine-specific setup here. This is called several
* times during initialization.
*/
void
s390x_init(int when)
{
switch (when)
{
case SETUP_ENV:
machdep->dumpfile_init = s390x_elf_note_add;
machdep->process_elf_notes = s390x_process_elf_notes;
break;
case PRE_SYMTAB:
machdep->verify_symbol = s390x_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 = KERNEL_STACK_SIZE;
if ((machdep->pgd = (char *)malloc(SEGMENT_TABLE_SIZE)) == 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;
machdep->get_kvaddr_ranges = s390x_get_kvaddr_ranges;
machdep->ptrs_per_pgd = PTRS_PER_PGD;
if (DUMPFILE() && !(kt->flags & RELOC_SET))
s390x_check_kaslr();
break;
case PRE_GDB:
machdep->kvbase = 0;
machdep->identity_map_base = 0;
machdep->is_kvaddr = generic_is_kvaddr;
machdep->is_uvaddr = s390x_is_uvaddr;
machdep->eframe_search = s390x_eframe_search;
machdep->back_trace = s390x_back_trace_cmd;
machdep->processor_speed = s390x_processor_speed;
machdep->uvtop = s390x_uvtop;
machdep->kvtop = s390x_kvtop;
machdep->get_task_pgd = s390x_get_task_pgd;
machdep->get_stack_frame = s390x_get_stack_frame;
machdep->get_stackbase = generic_get_stackbase;
machdep->get_stacktop = generic_get_stacktop;
machdep->translate_pte = s390x_translate_pte;
machdep->memory_size = generic_memory_size;
machdep->is_task_addr = s390x_is_task_addr;
machdep->dis_filter = s390x_dis_filter;
machdep->cmd_mach = s390x_cmd_mach;
machdep->get_smp_cpus = s390x_get_smp_cpus;
machdep->line_number_hooks = s390x_line_number_hooks;
machdep->value_to_symbol = generic_machdep_value_to_symbol;
machdep->init_kernel_pgd = NULL;
vt->flags |= COMMON_VADDR;
s390x_check_live();
break;
case POST_GDB:
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);
else
machdep->nr_irqs = 0;
machdep->vmalloc_start = s390x_vmalloc_start;
machdep->dump_irq = generic_dump_irq;
if (!machdep->hz)
machdep->hz = HZ;
machdep->section_size_bits = _SECTION_SIZE_BITS;
if (!set_s390x_max_physmem_bits())
error(WARNING, "cannot determine MAX_PHYSMEM_BITS\n");
s390x_offsets_init();
break;
case POST_INIT:
break;
}
}
/*
* Dump machine dependent information
*/
void
s390x_dump_machdep_table(ulong arg)
{
int others;
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->kvbase);
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, " 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",
(unsigned long long)machdep->memsize,
(unsigned long long)machdep->memsize);
fprintf(fp, " bits: %d\n", machdep->bits);
fprintf(fp, " nr_irqs: %d\n", machdep->nr_irqs);
fprintf(fp, " eframe_search: s390x_eframe_search()\n");
fprintf(fp, " back_trace: s390x_back_trace_cmd()\n");
fprintf(fp, " processor_speed: s390x_processor_speed()\n");
fprintf(fp, " uvtop: s390x_uvtop()\n");
fprintf(fp, " kvtop: s390x_kvtop()\n");
fprintf(fp, " get_task_pgd: s390x_get_task_pgd()\n");
fprintf(fp, " dump_irq: generic_dump_irq()\n");
fprintf(fp, " get_stack_frame: s390x_get_stack_frame()\n");
fprintf(fp, " get_stackbase: generic_get_stackbase()\n");
fprintf(fp, " get_stacktop: generic_get_stacktop()\n");
fprintf(fp, " translate_pte: s390x_translate_pte()\n");
fprintf(fp, " memory_size: generic_memory_size()\n");
fprintf(fp, " vmalloc_start: s390x_vmalloc_start()\n");
fprintf(fp, " is_task_addr: s390x_is_task_addr()\n");
fprintf(fp, " verify_symbol: s390x_verify_symbol()\n");
fprintf(fp, " dis_filter: s390x_dis_filter()\n");
fprintf(fp, " cmd_mach: s390x_cmd_mach()\n");
fprintf(fp, " get_smp_cpus: s390x_get_smp_cpus()\n");
fprintf(fp, " is_kvaddr: generic_is_kvaddr()\n");
fprintf(fp, " is_uvaddr: s390x_is_uvaddr()\n");
fprintf(fp, " verify_paddr: generic_verify_paddr()\n");
fprintf(fp, " get_kvaddr_ranges: s390x_get_kvaddr_ranges()\n");
fprintf(fp, " init_kernel_pgd: NULL\n");
fprintf(fp, " value_to_symbol: generic_machdep_value_to_symbol()\n");
fprintf(fp, " dumpfile_init: s390x_elf_note_add()\n");
fprintf(fp, " process_elf_notes: s390x_process_elf_notes()\n");
fprintf(fp, " line_number_hooks: s390x_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, " ptrs_per_pgd: %d\n", machdep->ptrs_per_pgd);
fprintf(fp, " max_physmem_bits: %ld\n", machdep->max_physmem_bits);
fprintf(fp, " section_size_bits: %ld\n", machdep->section_size_bits);
fprintf(fp, " machspec: %lx\n", (ulong)machdep->machspec);
}
/*
* Check if address is in context's address space
*/
static int
s390x_is_uvaddr(ulong vaddr, struct task_context *tc)
{
return IN_TASK_VMA(tc->task, vaddr);
}
/*
* Translates a user virtual address to its physical address
*/
static int
s390x_uvtop(struct task_context *tc, ulong vaddr, physaddr_t *paddr, int verbose)
{
unsigned long pgd_base;
readmem(tc->mm_struct + OFFSET(mm_struct_pgd), KVADDR,
&pgd_base,sizeof(long), "pgd_base",FAULT_ON_ERROR);
return s390x_vtop(pgd_base, vaddr, paddr, verbose);
}
/*
* Translates a kernel virtual address to its physical address
*/
static int
s390x_kvtop(struct task_context *tc, ulong vaddr, physaddr_t *paddr, int verbose)
{
unsigned long pgd_base;
if (!IS_KVADDR(vaddr)){
*paddr = 0;
return FALSE;
}
if (!vt->vmalloc_start) {
*paddr = VTOP(vaddr);
return TRUE;
}
if (!IS_VMALLOC_ADDR(vaddr)) {
*paddr = VTOP(vaddr);
return TRUE;
}
pgd_base = (unsigned long)vt->kernel_pgd[0];
return s390x_vtop(pgd_base, vaddr, paddr, verbose);
}
/*
* Check if page is mapped
*/
static inline int s390x_pte_present(unsigned long x){
if(THIS_KERNEL_VERSION >= LINUX(2,6,0)){
return !((x) & S390X_PAGE_INVALID) ||
((x) & S390X_PAGE_INVALID_MASK) == S390X_PAGE_INVALID_NONE;
} else {
return ((x) & S390X_PAGE_PRESENT);
}
}
/*
* page table traversal functions
*/
/* Print flags of Segment-Table entry with format control = 1 */
static void print_segment_entry_fc1(ulong val)
{
fprintf(fp, "AV=%u; ACC=%u%u%u%u; F=%u; FC=%u; P=%u; I=%u; CS=%u; TT=%u%u\n",
!!(val & S390X_STE_AV),
!!(val & S390X_STE_ACC_1000),
!!(val & S390X_STE_ACC_0100),
!!(val & S390X_STE_ACC_0010),
!!(val & S390X_STE_ACC_0001),
!!(val & S390X_STE_F),
!!(val & S390X_STE_FC),
!!(val & S390X_STE_P),
!!(val & S390X_STE_I),
!!(val & S390X_STE_CS),
!!(val & S390X_STE_TT_10),
!!(val & S390X_STE_TT_01));
}
/* Print flags of Segment-Table entry with format control = 0 */
static void print_segment_entry_fc0(ulong val)
{
fprintf(fp, "FC=%u; P=%u; I=%u; CS=%u; TT=%u%u\n",
!!(val & S390X_STE_FC),
!!(val & S390X_STE_P),
!!(val & S390X_STE_I),
!!(val & S390X_STE_CS),
!!(val & S390X_STE_TT_10),
!!(val & S390X_STE_TT_01));
}
/* Print flags of Region-Third-Table entry with format control = 1 */
static void print_region_third_entry_fc1(ulong val)
{
fprintf(fp, "AV=%u; ACC=%u%u%u%u; F=%u; FC=%u; P=%u; I=%u; CR=%u; TT=%u%u\n",
!!(val & S390X_RTE_AV),
!!(val & S390X_RTE_ACC_1000),
!!(val & S390X_RTE_ACC_0100),
!!(val & S390X_RTE_ACC_0010),
!!(val & S390X_RTE_ACC_0001),
!!(val & S390X_RTE_F),
!!(val & S390X_RTE_FC),
!!(val & S390X_RTE_P),
!!(val & S390X_RTE_I),
!!(val & S390X_RTE_CR),
!!(val & S390X_RTE_TT_10),
!!(val & S390X_RTE_TT_01));
}
/* Print flags of Region-Third-Table entry with format control = 0 */
static void print_region_third_entry_fc0(ulong val)
{
fprintf(fp, "FC=%u; P=%u; TF=%u%u; I=%u; CR=%u; TT=%u%u; TL=%u%u\n",
!!(val & S390X_RTE_FC),
!!(val & S390X_RTE_P),
!!(val & S390X_RTE_TF_10),
!!(val & S390X_RTE_TF_01),
!!(val & S390X_RTE_I),
!!(val & S390X_RTE_CR),
!!(val & S390X_RTE_TT_10),
!!(val & S390X_RTE_TT_01),
!!(val & S390X_RTE_TL_10),
!!(val & S390X_RTE_TL_01));
}
/* Print flags of Region-First/Second-Table entry */
static void print_region_first_second_entry(ulong val)
{
fprintf(fp, "P=%u; TF=%u%u; I=%u; TT=%u%u; TL=%u%u\n",
!!(val & S390X_RTE_P),
!!(val & S390X_RTE_TF_10),
!!(val & S390X_RTE_TF_01),
!!(val & S390X_RTE_I),
!!(val & S390X_RTE_TT_10),
!!(val & S390X_RTE_TT_01),
!!(val & S390X_RTE_TL_10),
!!(val & S390X_RTE_TL_01));
}
/* Print the binary flags for Region or Segment table entry */
static void s390x_print_te_binary_flags(ulong val, int level)
{
fprintf(fp, " flags in binary : ");
switch (level) {
case 0:
if (val & S390X_STE_FC)
print_segment_entry_fc1(val);
else
print_segment_entry_fc0(val);
break;
case 1:
if (val & S390X_RTE_FC)
print_region_third_entry_fc1(val);
else
print_region_third_entry_fc0(val);
break;
case 2:
case 3:
print_region_first_second_entry(val);
break;
}
}
/* Region or segment table traversal function */
static ulong _kl_rsg_table_deref_s390x(ulong vaddr, ulong table,
int len, int level, int verbose)
{
const char *name_vec[] = {"STE", "RTTE", "RSTE", "RFTE"};
ulong offset, entry, flags, addr;
int flags_prt_len;
offset = ((vaddr >> (11*level + 20)) & 0x7ffULL) * 8;
if (offset >= (len + 1)*4096)
/* Offset is over the table limit. */
return 0;
addr = table + offset;
readmem(addr, KVADDR, &entry, sizeof(entry), "entry", FAULT_ON_ERROR);
if (verbose) {
flags_prt_len = 3;
if (entry & S390X_RTE_FC)
if (level) {
flags = entry & S390X_RTE_FLAG_BITS_FC1;
flags_prt_len = 8;
} else {
flags = entry & S390X_STE_FLAG_BITS_FC1;
flags_prt_len = 5;
}
else
if (level)
flags = entry & S390X_RTE_FLAG_BITS_FC0;
else
flags = entry & S390X_STE_FLAG_BITS_FC0;
fprintf(fp, "%5s: %016lx => %016lx (flags = %0*lx)\n",
name_vec[level], addr, entry, flags_prt_len, flags);
s390x_print_te_binary_flags(entry, level);
}
/*
* Check if the segment table entry could be read and doesn't have
* any of the reserved bits set.
*/
if ((entry & S390X_RTE_TT) != (level << 2))
return 0;
/* Check if the region table entry has the invalid bit set. */
if (entry & S390X_RTE_I)
return 0;
/* Region table entry is valid and well formed. */
return entry;
}
/* Check for swap entry */
static int swap_entry(ulong entry)
{
if (THIS_KERNEL_VERSION < LINUX(2,6,19)) {
if ((entry & 0x601ULL) == 0x600ULL)
return 1;
} if (THIS_KERNEL_VERSION < LINUX(3,12,0)) {
if ((entry & 0x403ULL) == 0x403ULL)
return 1;
} else {
if ((entry & 0x603ULL) == 0x402ULL)
return 1;
}
return 0;
}
/* Page table traversal function */
static ulong _kl_pg_table_deref_s390x(ulong vaddr, ulong table, int verbose)
{
ulong offset, entry, addr;
offset = ((vaddr >> 12) & 0xffULL) * 8;
addr = table + offset;
readmem(addr, KVADDR, &entry, sizeof(entry), "entry", FAULT_ON_ERROR);
if (verbose) {
fprintf(fp, "%5s: %016lx => %016lx (flags = %03llx)\n",
"PTE", addr, entry, entry & S390X_PTE_FLAG_BITS);
fprintf(fp, " flags in binary : I=%u; P=%u\n",
!!(entry & S390X_PAGE_INVALID), !!(entry & S390X_PAGE_RO));
fprintf(fp, "%5s: %016llx\n", "PAGE", entry & ~S390X_PTE_FLAG_BITS);
}
/*
* Return zero if the page table entry has the reserved (0x800) or
* the invalid (0x400) bit set and it is not a swap entry.
*/
if ((entry & 0xc00ULL) && !swap_entry(entry))
return 0;
/* Page table entry is valid and well formed. */
return entry;
}
/* lookup virtual address in page tables */
int s390x_vtop(ulong table, ulong vaddr, physaddr_t *phys_addr, int verbose)
{
ulong entry, paddr;
int level, len;
if (verbose)
fprintf(fp, "PAGE DIRECTORY: %016lx\n", table);
*phys_addr = 0;
/*
* Walk the region and segment tables.
* We assume that the table length field in the asce is set to the
* maximum value of 3 (which translates to a region first, region
* second, region third or segment table with 2048 entries) and that
* the addressing mode is 64 bit.
*/
len = 3;
/* Read the first entry to find the number of page table levels. */
readmem(table, KVADDR, &entry, sizeof(entry), "entry", FAULT_ON_ERROR);
level = (entry & 0xcULL) >> 2;
if ((level < 3) && (vaddr >> (31 + 11*level)) != 0ULL) {
/* Address too big for the number of page table levels. */
return FALSE;
}
while (level >= 0) {
entry = _kl_rsg_table_deref_s390x(vaddr, table, len, level,
verbose);
if (!entry)
return FALSE;
table = entry & ~0xfffULL;
/* Check if this a 2GB page */
if ((entry & 0x400ULL) && (level == 1)) {
/* Add the 2GB frame offset & return the final value. */
table &= ~0x7fffffffULL;
*phys_addr = table + (vaddr & 0x7fffffffULL);
return TRUE;
}
len = entry & 0x3ULL;
level--;
}
/* Check if this is a large page. */
if (entry & 0x400ULL) {
/* Add the 1MB page offset and return the final value. */
table &= ~0xfffffULL;
*phys_addr = table + (vaddr & 0xfffffULL);
return TRUE;
}
/* Get the page table entry */
entry = _kl_pg_table_deref_s390x(vaddr, entry & ~0x7ffULL, verbose);
if (!entry)
return FALSE;
/* For swap entries we have to return FALSE and phys_addr = PTE */
if (swap_entry(entry)) {
*phys_addr = entry;
return FALSE;
}
/* Isolate the page origin from the page table entry. */
paddr = entry & ~0xfffULL;
/* Add the page offset and return the final value. */
*phys_addr = paddr + (vaddr & 0xfffULL);
return TRUE;
}
/*
* Determine where vmalloc'd memory starts.
*/
static ulong
s390x_vmalloc_start(void)
{
unsigned long highmem_addr,high_memory;
highmem_addr=symbol_value("high_memory");
readmem(highmem_addr, PHYSADDR, &high_memory,sizeof(long),
"highmem",FAULT_ON_ERROR);
return high_memory;
}
/*
* Check if address can be a valid task_struct
*/
static int
s390x_is_task_addr(ulong task)
{
if (tt->flags & THREAD_INFO)
return IS_KVADDR(task);
else
return (IS_KVADDR(task) && (ALIGNED_STACK_OFFSET(task) == 0));
}
/*
* return MHz - unfortunately it is not possible to get this on linux
* for zSeries
*/
static ulong
s390x_processor_speed(void)
{
return 0;
}
/*
* Accept or reject a symbol from the kernel namelist.
*/
static int
s390x_verify_symbol(const char *name, ulong value, char type)
{
int i;
if (CRASHDEBUG(8) && name && strlen(name))
fprintf(fp, "%08lx %s\n", value, name);
if (STREQ(name, "startup") || STREQ(name, "_stext"))
machdep->flags |= KSYMS_START;
if (!name || !strlen(name) || !(machdep->flags & KSYMS_START))
return FALSE;
if ((type == 'A') && STRNEQ(name, "__crc_"))
return FALSE;
if (STREQ(name, "Letext") || STREQ(name, "gcc2_compiled."))
return FALSE;
/* reject L2^B symbols */
if (strstr(name, "L2\002") == name)
return FALSE;
/* throw away all symbols containing a '.' */
for(i = 0; i < strlen(name);i++){
if(name[i] == '.')
return FALSE;
}
return TRUE;
}
/*
* Get the relevant page directory pointer from a task structure.
*/
static ulong
s390x_get_task_pgd(ulong task)
{
return (error(FATAL, "s390x_get_task_pgd: TBD\n"));
}
/*
* Translate a PTE, returning TRUE if the page is present.
* If a physaddr pointer is passed in, don't print anything.
*/
static int
s390x_translate_pte(ulong pte, void *physaddr, ulonglong unused)
{
char *arglist[MAXARGS];
char buf[BUFSIZE];
char buf2[BUFSIZE];
char buf3[BUFSIZE];
char ptebuf[BUFSIZE];
int c,len1,len2,len3;
if(S390X_PTE_INVALID(pte)){
fprintf(fp,"PTE is invalid\n");
return FALSE;
}
if(physaddr)
*((ulong *)physaddr) = pte & S390X_PAGE_BASE_MASK;
if(!s390x_pte_present(pte)){
swap_location(pte, buf);
if ((c = parse_line(buf, arglist)) != 3)
error(FATAL, "cannot determine swap location\n");
sprintf(ptebuf, "%lx", pte);
len1 = MAX(strlen(ptebuf), strlen("PTE"));
len2 = MAX(strlen(arglist[0]), strlen("SWAP"));
len3 = MAX(strlen(arglist[2]), strlen("OFFSET"));
fprintf(fp, "%s %s %s\n",
mkstring(ptebuf, len1, CENTER|LJUST, "PTE"),
mkstring(buf2, len2, CENTER|LJUST, "SWAP"),
mkstring(buf3, len3, CENTER|LJUST, "OFFSET"));
sprintf(ptebuf, "%lx", pte);
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 FALSE;
}
fprintf(fp,"PTE PHYSICAL FLAGS\n");
fprintf(fp,"%08lx %08llx",pte, pte & S390X_PAGE_BASE_MASK);
fprintf(fp," (");
if(pte & S390X_PAGE_INVALID)
fprintf(fp,"INVALID ");
if(pte & S390X_PAGE_RO)
fprintf(fp,"PROTECTION");
fprintf(fp,")");
return TRUE;
}
/*
* Look for likely exception frames in a stack.
*/
static int
s390x_eframe_search(struct bt_info *bt)
{
if(bt->flags & BT_EFRAME_SEARCH2)
return (error(FATAL,
"Option '-E' is not implemented for this architecture\n"));
else
return (error(FATAL,
"Option '-e' is not implemented for this architecture\n"));
}
#ifdef DEPRECATED
/*
* returns cpu number of task
*/
static int
s390x_cpu_of_task(unsigned long task)
{
unsigned int cpu;
if(VALID_MEMBER(task_struct_processor)){
/* linux 2.4 */
readmem(task + OFFSET(task_struct_processor),KVADDR,
&cpu, sizeof(cpu), "task_struct_processor",
FAULT_ON_ERROR);
} else {
/* linux 2.6 */
char thread_info[8192];
unsigned long thread_info_addr;
readmem(task + OFFSET(task_struct_thread_info),KVADDR,
&thread_info_addr, sizeof(thread_info_addr),
"thread info addr", FAULT_ON_ERROR);
readmem(thread_info_addr,KVADDR,thread_info,sizeof(thread_info),
"thread info", FAULT_ON_ERROR);
cpu = *((int*) &thread_info[OFFSET(thread_info_cpu)]);
}
return cpu;
}
#endif
/*
* returns true, if task of bt currently is executed by a cpu
*/
static int
s390x_has_cpu(struct bt_info *bt)
{
int cpu = bt->tc->processor;
if (is_task_active(bt->task) && (kt->cpu_flags[cpu] & ONLINE_MAP))
return TRUE;
else
return FALSE;
}
/*
* read lowcore for cpu
*/
static void
s390x_get_lowcore(struct bt_info *bt, char* lowcore)
{
unsigned long lowcore_array,lowcore_ptr;
struct s390x_cpu *s390x_cpu;
int cpu = bt->tc->processor;
lowcore_array = symbol_value("lowcore_ptr");
readmem(lowcore_array + cpu * S390X_WORD_SIZE,KVADDR,
&lowcore_ptr, sizeof(long), "lowcore_ptr", FAULT_ON_ERROR);
readmem(lowcore_ptr, KVADDR, lowcore, LOWCORE_SIZE, "lowcore",
FAULT_ON_ERROR);
if (!s390x_cpu_vec)
return;
/* Copy register information to defined places in lowcore */
s390x_cpu = s390x_cpu_get(bt);
memcpy(lowcore + 4864, &s390x_cpu->psw, sizeof(s390x_cpu->psw));
memcpy(lowcore + 4736, &s390x_cpu->gprs, sizeof(s390x_cpu->gprs));
memcpy(lowcore + 4928, &s390x_cpu->acrs, sizeof(s390x_cpu->acrs));
memcpy(lowcore + 4892, &s390x_cpu->fpc, sizeof(s390x_cpu->fpc));
memcpy(lowcore + 4608, &s390x_cpu->fprs, sizeof(s390x_cpu->fprs));
memcpy(lowcore + 4888, &s390x_cpu->prefix, sizeof(s390x_cpu->prefix));
memcpy(lowcore + 4992, &s390x_cpu->ctrs, sizeof(s390x_cpu->ctrs));
memcpy(lowcore + 4900, &s390x_cpu->todpreg, sizeof(s390x_cpu->todpreg));
memcpy(lowcore + 4904, &s390x_cpu->timer, sizeof(s390x_cpu->timer));
memcpy(lowcore + 4912, &s390x_cpu->todcmp, sizeof(s390x_cpu->todcmp));
}
/*
* Copy VX registers out of s390x cpu
*/
static void vx_copy(void *buf, struct s390x_cpu *s390x_cpu)
{
char *_buf = buf;
int i;
for (i = 0; i < 16; i++) {
memcpy(&_buf[i * 16], &s390x_cpu->fprs[i], 8);
memcpy(&_buf[i * 16 + 8], &s390x_cpu->vxrs_low[i], 8);
}
memcpy(&_buf[16 * 16], &s390x_cpu->vxrs_high[0], 16 * 16);
}
/*
* Check if VX registers are available
*/
static int has_vx_regs(char *lowcore)
{
unsigned long addr = *((uint64_t *)(lowcore + 0x11b0));
if (addr == 0 || addr % 1024)
return 0;
return 1;
}
/*
* Print vector registers for cpu
*/
static void
s390x_print_vx_sa(struct bt_info *bt, char *lc)
{
char vx_sa[VX_SA_SIZE];
uint64_t addr;
if (!(bt->flags & BT_SHOW_ALL_REGS))
return;
if (!has_vx_regs(lc))
return;
if (!s390x_cpu_vec) {
/* Pointer to save area */
addr = *((uint64_t *)(lc + 0x11b0));
readmem(addr, KVADDR, vx_sa, sizeof(vx_sa), "vx_sa",
FAULT_ON_ERROR);
} else {
/* Get data from s390x cpu */
vx_copy(vx_sa, s390x_cpu_get(bt));
}
fprintf(fp, " -vector registers:\n");
print_hex_buf(vx_sa, sizeof(vx_sa), 2, " ");
}
/*
* Get stack address for interrupt stack using the pcpu array
*/
static unsigned long get_int_stack_pcpu(char *stack_name, int cpu)
{
unsigned long addr;
addr = symbol_value("pcpu_devices") +
cpu * STRUCT_SIZE("pcpu") + MEMBER_OFFSET("pcpu", stack_name);
return readmem_ul(addr) + INT_STACK_SIZE;
}
/*
* Get stack address for interrupt stack using the lowcore
*/
static unsigned long get_int_stack_lc(char *stack_name, char *lc)
{
if (!MEMBER_EXISTS(lc_struct, stack_name))
return 0;
return roundup(ULONG(lc + MEMBER_OFFSET(lc_struct, stack_name)),
PAGESIZE());
}
/*
* Read interrupt stack (either "async_stack" or "panic_stack");
*/
static void get_int_stack(char *stack_name, int cpu, char *lc,
unsigned long *start, unsigned long *end)
{
unsigned long stack_addr;
*start = *end = 0;
if (strcmp(stack_name, "restart_stack") == 0) {
stack_addr = symbol_value("restart_stack");
stack_addr = readmem_ul(stack_addr);
} else {
if (symbol_exists("pcpu_devices") && MEMBER_EXISTS("pcpu", stack_name))
stack_addr = get_int_stack_pcpu(stack_name, cpu);
else
stack_addr = get_int_stack_lc(stack_name, lc);
}
if (stack_addr == 0)
return;
*start = stack_addr - INT_STACK_SIZE;
*end = stack_addr;
}
/*
* Print hex data
*/
static void print_hex(unsigned long addr, int len, int cols)
{
int j, first = 1;
for (j = 0; j < len; j += 8) {
if (j % (cols * 8) == 0) {
if (!first)
fprintf(fp, "\n");
else
first = 0;
fprintf(fp, " %016lx: ", addr + j);
}
fprintf(fp, " %016lx", readmem_ul(addr + j));
}
if (len)
fprintf(fp, "\n");
}
/*
* Print hexdump of stack frame data
*/
static void print_frame_data(unsigned long sp, unsigned long high)
{
unsigned long next_sp, len = high - sp;
next_sp = readmem_ul(sp + MEMBER_OFFSET("stack_frame", "back_chain"));
if (next_sp == 0)
len = MIN(len, SIZE(s390_stack_frame) + STRUCT_SIZE("pt_regs"));
else
len = MIN(len, next_sp - sp);
print_hex(sp, len, 2);
}
/*
* Do reference check and set flags
*/
static int bt_reference_check(struct bt_info *bt, unsigned long addr)
{
if (!BT_REFERENCE_CHECK(bt))
return 0;
if (bt->ref->cmdflags & BT_REF_HEXVAL) {
if (addr == bt->ref->hexval)
bt->ref->cmdflags |= BT_REF_FOUND;
} else {
if (STREQ(closest_symbol(addr), bt->ref->str))
bt->ref->cmdflags |= BT_REF_FOUND;
}
return 1;
}
/*
* Print stack frame
*/
static void print_frame(struct bt_info *bt, int cnt, unsigned long sp,
unsigned long r14)
{
struct load_module *lm;
char *sym;
ulong offset;
struct syment *symp;
char *name_plus_offset;
char buf[BUFSIZE];
if (bt_reference_check(bt, r14))
return;
fprintf(fp, "%s#%d [%08lx] ", cnt < 10 ? " " : "", cnt, sp);
sym = closest_symbol(r14);
name_plus_offset = NULL;
if (bt->flags & BT_SYMBOL_OFFSET) {
symp = value_search(r14, &offset);
if (symp && offset)
name_plus_offset = value_to_symstr(r14, buf, bt->radix);
}
fprintf(fp, "%s at %lx", name_plus_offset ? name_plus_offset : sym, r14);
if (module_symbol(r14, NULL, &lm, NULL, 0))
fprintf(fp, " [%s]", lm->mod_name);
fprintf(fp, "\n");
if (bt->flags & BT_LINE_NUMBERS)
s390x_dump_line_number(r14);
}
/*
* Print pt_regs structure
*/
static void print_ptregs(struct bt_info *bt, unsigned long sp)
{
unsigned long addr, psw_flags, psw_addr, offs;
struct load_module *lm;
char *sym;
int i;
addr = sp + MEMBER_OFFSET("pt_regs", "psw");
psw_flags = readmem_ul(addr);
psw_addr = readmem_ul(addr + sizeof(long));
if (bt_reference_check(bt, psw_addr))
return;
fprintf(fp, " PSW: %016lx %016lx ", psw_flags, psw_addr);
if (psw_flags & S390X_PSW_MASK_PSTATE) {
fprintf(fp, "(user space)\n");
} else {
sym = closest_symbol(psw_addr);
offs = psw_addr - closest_symbol_value(psw_addr);
if (module_symbol(psw_addr, NULL, &lm, NULL, 0))
fprintf(fp, "(%s+%ld [%s])\n", sym, offs, lm->mod_name);
else
fprintf(fp, "(%s+%ld)\n", sym, offs);
}
addr = sp + MEMBER_OFFSET("pt_regs", "gprs");
for (i = 0; i < 16; i++) {
if (i != 0 && i % 4 == 0)
fprintf(fp, "\n");
if (i % 4 == 0) {
if (i == 0)
fprintf(fp, " GPRS: ");
else
fprintf(fp, " ");
}
fprintf(fp, "%016lx ", readmem_ul(addr + i * sizeof(long)));
}
fprintf(fp, "\n");
}
/*
* Print back trace for one stack
*/
static unsigned long show_trace(struct bt_info *bt, int cnt, unsigned long sp,
unsigned long low, unsigned long high)
{
unsigned long reg;
unsigned long psw_addr ATTRIBUTE_UNUSED;
while (1) {
if (sp < low || sp > high - SIZE(s390_stack_frame))
return sp;
reg = readmem_ul(sp + OFFSET(s390_stack_frame_r14));
if (!s390x_has_cpu(bt))
print_frame(bt, cnt++, sp, reg);
if (bt->flags & BT_FULL)
print_frame_data(sp, high);
/* Follow the backchain. */
while (1) {
low = sp;
sp = readmem_ul(sp +
OFFSET(s390_stack_frame_back_chain));
if (!sp) {
sp = low;
break;
}
if (sp <= low || sp > high - SIZE(s390_stack_frame))
return sp;
reg = readmem_ul(sp + OFFSET(s390_stack_frame_r14));
print_frame(bt, cnt++, sp, reg);
if (bt->flags & BT_FULL)
print_frame_data(sp, high);
}
/* Zero backchain detected, check for interrupt frame. */
sp += SIZE(s390_stack_frame);
if (sp <= low || sp > high - STRUCT_SIZE("pt_regs"))
return sp;
/* Check for user PSW */
reg = readmem_ul(sp + MEMBER_OFFSET("pt_regs", "psw"));
if (reg & S390X_PSW_MASK_PSTATE) {
print_ptregs(bt, sp);
return sp;
}
/* Get new backchain from r15 */
reg = readmem_ul(sp + MEMBER_OFFSET("pt_regs", "gprs") +
15 * sizeof(long));
/* Get address of interrupted function */
psw_addr = readmem_ul(sp + MEMBER_OFFSET("pt_regs", "psw") +
sizeof(long));
/* Check for loop (kernel_thread_starter) of second zero bc */
if (low == reg || reg == 0)
return reg;
print_ptregs(bt, sp);
low = sp;
sp = reg;
cnt = 0;
}
}
/*
* Unroll a kernel stack
*/
static void s390x_back_trace_cmd(struct bt_info *bt)
{
unsigned long low, high, sp = bt->stkptr;
int cpu = bt->tc->processor, cnt = 0;
char lowcore[LOWCORE_SIZE];
unsigned long psw_flags;
if (bt->hp && bt->hp->eip) {
error(WARNING,
"instruction pointer argument ignored on this architecture!\n");
}
if (is_task_active(bt->task) && !(kt->cpu_flags[cpu] & ONLINE_MAP)) {
fprintf(fp, " CPU offline\n");
return;
}
/*
* Print lowcore and print interrupt stacks when task has cpu
*/
if (s390x_has_cpu(bt)) {
s390x_get_lowcore(bt, lowcore);
psw_flags = ULONG(lowcore + OFFSET(s390_lowcore_psw_save_area));
if (psw_flags & S390X_PSW_MASK_PSTATE) {
fprintf(fp,"Task runs in userspace\n");
s390x_print_lowcore(lowcore,bt,0);
s390x_print_vx_sa(bt, lowcore);
return;
}
s390x_print_lowcore(lowcore,bt,1);
s390x_print_vx_sa(bt, lowcore);
fprintf(fp,"\n");
if (symbol_exists("restart_stack")) {
get_int_stack("restart_stack",
cpu, lowcore, &low, &high);
sp = show_trace(bt, cnt, sp, low, high);
}
get_int_stack("panic_stack", cpu, lowcore, &low, &high);
sp = show_trace(bt, cnt, sp, low, high);
get_int_stack("async_stack", cpu, lowcore, &low, &high);
sp = show_trace(bt, cnt, sp, low, high);
}
/*
* Print task stack
*/
if (THIS_KERNEL_VERSION >= LINUX(2, 6, 0)) {
low = task_to_stackbase(bt->task);
} else {
low = bt->task;
}
high = low + KERNEL_STACK_SIZE;
sp = show_trace(bt, cnt, sp, low, high);
}
/*
* print lowcore info (psw and all registers)
*/
static void
s390x_print_lowcore(char* lc, struct bt_info *bt,int show_symbols)
{
char* ptr;
unsigned long tmp[4];
ptr = lc + OFFSET(s390_lowcore_psw_save_area);
tmp[0]=ULONG(ptr);
tmp[1]=ULONG(ptr + S390X_WORD_SIZE);
if(BT_REFERENCE_CHECK(bt)){
if(bt->ref->cmdflags & BT_REF_HEXVAL){
if(tmp[1] == bt->ref->hexval)
bt->ref->cmdflags |= BT_REF_FOUND;
} else {
if(STREQ(closest_symbol(tmp[1]),bt->ref->str))
bt->ref->cmdflags |= BT_REF_FOUND;
}
return;
}
fprintf(fp," LOWCORE INFO:\n");
fprintf(fp," -psw : %#018lx %#018lx\n", tmp[0], tmp[1]);
if(show_symbols){
fprintf(fp," -function : %s at %lx\n",
closest_symbol(tmp[1]), tmp[1]);
if (bt->flags & BT_LINE_NUMBERS)
s390x_dump_line_number(tmp[1]);
}
ptr = lc + MEMBER_OFFSET(lc_struct, "prefixreg_save_area");
tmp[0] = UINT(ptr);
fprintf(fp," -prefix : %#010lx\n", tmp[0]);
ptr = lc + MEMBER_OFFSET(lc_struct, "cpu_timer_save_area");
tmp[0]=ULONG(ptr);
fprintf(fp," -cpu timer: %#018lx\n", tmp[0]);
ptr = lc + MEMBER_OFFSET(lc_struct, "clock_comp_save_area");
/*
* Shift clock comparator by 8 because we got bit positions 0-55
* in byte 1 to 8. The first byte is always zero.
*/
tmp[0]=ULONG(ptr) << 8;
fprintf(fp," -clock cmp: %#018lx\n", tmp[0]);
fprintf(fp," -general registers:\n");
ptr = lc + MEMBER_OFFSET(lc_struct, "gpregs_save_area");
tmp[0]=ULONG(ptr);
tmp[1]=ULONG(ptr + S390X_WORD_SIZE);
tmp[2]=ULONG(ptr + 2 * S390X_WORD_SIZE);
tmp[3]=ULONG(ptr + 3 * S390X_WORD_SIZE);
fprintf(fp," %#018lx %#018lx\n", tmp[0],tmp[1]);
fprintf(fp," %#018lx %#018lx\n", tmp[2],tmp[3]);
tmp[0]=ULONG(ptr + 4 * S390X_WORD_SIZE);
tmp[1]=ULONG(ptr + 5 * S390X_WORD_SIZE);
tmp[2]=ULONG(ptr + 6 * S390X_WORD_SIZE);
tmp[3]=ULONG(ptr + 7 * S390X_WORD_SIZE);
fprintf(fp," %#018lx %#018lx\n", tmp[0],tmp[1]);
fprintf(fp," %#018lx %#018lx\n", tmp[2],tmp[3]);
tmp[0]=ULONG(ptr + 8 * S390X_WORD_SIZE);
tmp[1]=ULONG(ptr + 9 * S390X_WORD_SIZE);
tmp[2]=ULONG(ptr + 10* S390X_WORD_SIZE);
tmp[3]=ULONG(ptr + 11* S390X_WORD_SIZE);
fprintf(fp," %#018lx %#018lx\n", tmp[0],tmp[1]);
fprintf(fp," %#018lx %#018lx\n", tmp[2],tmp[3]);
tmp[0]=ULONG(ptr + 12* S390X_WORD_SIZE);
tmp[1]=ULONG(ptr + 13* S390X_WORD_SIZE);
tmp[2]=ULONG(ptr + 14* S390X_WORD_SIZE);
tmp[3]=ULONG(ptr + 15* S390X_WORD_SIZE);
fprintf(fp," %#018lx %#018lx\n", tmp[0],tmp[1]);
fprintf(fp," %#018lx %#018lx\n", tmp[2],tmp[3]);
fprintf(fp," -access registers:\n");
ptr = lc + MEMBER_OFFSET(lc_struct, "access_regs_save_area");
tmp[0]=UINT(ptr);
tmp[1]=UINT(ptr + 4);
tmp[2]=UINT(ptr + 2 * 4);
tmp[3]=UINT(ptr + 3 * 4);
fprintf(fp," %#010lx %#010lx %#010lx %#010lx\n",
tmp[0], tmp[1], tmp[2], tmp[3]);
tmp[0]=UINT(ptr + 4 * 4);
tmp[1]=UINT(ptr + 5 * 4);
tmp[2]=UINT(ptr + 6 * 4);
tmp[3]=UINT(ptr + 7 * 4);
fprintf(fp," %#010lx %#010lx %#010lx %#010lx\n",
tmp[0], tmp[1], tmp[2], tmp[3]);
tmp[0]=UINT(ptr + 8 * 4);
tmp[1]=UINT(ptr + 9 * 4);
tmp[2]=UINT(ptr + 10 * 4);
tmp[3]=UINT(ptr + 11 * 4);
fprintf(fp," %#010lx %#010lx %#010lx %#010lx\n",
tmp[0], tmp[1], tmp[2], tmp[3]);
tmp[0]=UINT(ptr + 12 * 4);
tmp[1]=UINT(ptr + 13 * 4);
tmp[2]=UINT(ptr + 14 * 4);
tmp[3]=UINT(ptr + 15 * 4);
fprintf(fp," %#010lx %#010lx %#010lx %#010lx\n",
tmp[0], tmp[1], tmp[2], tmp[3]);
fprintf(fp," -control registers:\n");
ptr = lc + MEMBER_OFFSET(lc_struct, "cregs_save_area");
tmp[0]=ULONG(ptr);
tmp[1]=ULONG(ptr + S390X_WORD_SIZE);
tmp[2]=ULONG(ptr + 2 * S390X_WORD_SIZE);
tmp[3]=ULONG(ptr + 3 * S390X_WORD_SIZE);
fprintf(fp," %#018lx %#018lx\n", tmp[0],tmp[1]);
fprintf(fp," %#018lx %#018lx\n", tmp[2],tmp[3]);
tmp[0]=ULONG(ptr + 4 * S390X_WORD_SIZE);
tmp[1]=ULONG(ptr + 5 * S390X_WORD_SIZE);
tmp[2]=ULONG(ptr + 6 * S390X_WORD_SIZE);
tmp[3]=ULONG(ptr + 7 * S390X_WORD_SIZE);
fprintf(fp," %#018lx %#018lx\n", tmp[0],tmp[1]);
fprintf(fp," %#018lx %#018lx\n", tmp[2],tmp[3]);
tmp[0]=ULONG(ptr + 8 * S390X_WORD_SIZE);
tmp[1]=ULONG(ptr + 9 * S390X_WORD_SIZE);
tmp[2]=ULONG(ptr + 10 * S390X_WORD_SIZE);
tmp[3]=ULONG(ptr + 11 * S390X_WORD_SIZE);
fprintf(fp," %#018lx %#018lx\n", tmp[0],tmp[1]);
fprintf(fp," %#018lx %#018lx\n", tmp[2],tmp[3]);
tmp[0]=ULONG(ptr + 12 * S390X_WORD_SIZE);
tmp[1]=ULONG(ptr + 13 * S390X_WORD_SIZE);
tmp[2]=ULONG(ptr + 14 * S390X_WORD_SIZE);
tmp[3]=ULONG(ptr + 15 * S390X_WORD_SIZE);
fprintf(fp," %#018lx %#018lx\n", tmp[0],tmp[1]);
fprintf(fp," %#018lx %#018lx\n", tmp[2],tmp[3]);
ptr = lc + MEMBER_OFFSET(lc_struct, "floating_pt_save_area");
fprintf(fp," -floating point registers:\n");
tmp[0]=ULONG(ptr);
tmp[1]=ULONG(ptr + S390X_WORD_SIZE);
tmp[2]=ULONG(ptr + 2 * S390X_WORD_SIZE);
tmp[3]=ULONG(ptr + 3 * S390X_WORD_SIZE);
fprintf(fp," %#018lx %#018lx\n", tmp[0],tmp[1]);
fprintf(fp," %#018lx %#018lx\n", tmp[2],tmp[3]);
tmp[0]=ULONG(ptr + 4 * S390X_WORD_SIZE);
tmp[1]=ULONG(ptr + 5 * S390X_WORD_SIZE);
tmp[2]=ULONG(ptr + 6 * S390X_WORD_SIZE);
tmp[3]=ULONG(ptr + 7 * S390X_WORD_SIZE);
fprintf(fp," %#018lx %#018lx\n", tmp[0],tmp[1]);
fprintf(fp," %#018lx %#018lx\n", tmp[2],tmp[3]);
tmp[0]=ULONG(ptr + 8 * S390X_WORD_SIZE);
tmp[1]=ULONG(ptr + 9 * S390X_WORD_SIZE);
tmp[2]=ULONG(ptr + 10 * S390X_WORD_SIZE);
tmp[3]=ULONG(ptr + 11 * S390X_WORD_SIZE);
fprintf(fp," %#018lx %#018lx\n", tmp[0],tmp[1]);
fprintf(fp," %#018lx %#018lx\n", tmp[2],tmp[3]);
tmp[0]=ULONG(ptr + 12 * S390X_WORD_SIZE);
tmp[1]=ULONG(ptr + 13 * S390X_WORD_SIZE);
tmp[2]=ULONG(ptr + 14 * S390X_WORD_SIZE);
tmp[3]=ULONG(ptr + 15 * S390X_WORD_SIZE);
fprintf(fp," %#018lx %#018lx\n", tmp[0],tmp[1]);
fprintf(fp," %#018lx %#018lx\n", tmp[2],tmp[3]);
}
/*
* Get a stack frame combination of pc and ra from the most relevent spot.
*/
static void
s390x_get_stack_frame(struct bt_info *bt, ulong *eip, ulong *esp)
{
unsigned long ksp, r14;
int r14_offset;
char lowcore[LOWCORE_SIZE];
if(s390x_has_cpu(bt))
s390x_get_lowcore(bt, lowcore);
/* get the stack pointer */
if(esp){
if (!LIVE() && s390x_has_cpu(bt)) {
ksp = ULONG(lowcore + MEMBER_OFFSET(lc_struct,
"gpregs_save_area") + (15 * S390X_WORD_SIZE));
} else {
readmem(bt->task + OFFSET(task_struct_thread_ksp),
KVADDR, &ksp, sizeof(void *),
"thread_struct ksp", FAULT_ON_ERROR);
}
*esp = ksp;
} else {
/* for 'bt -S' */
ksp=bt->hp->esp;
}
/* get the instruction address */
if(!eip)
return;
if(s390x_has_cpu(bt) && esp){
*eip = ULONG(lowcore + OFFSET(s390_lowcore_psw_save_area) +
S390X_WORD_SIZE);
} else {
if(!STRUCT_EXISTS("stack_frame")){
r14_offset = 112;
} else {
r14_offset = MEMBER_OFFSET("stack_frame","gprs") +
8 * S390X_WORD_SIZE;
}
readmem(ksp + r14_offset,KVADDR,&r14,sizeof(void*),"eip",
FAULT_ON_ERROR);
*eip=r14;
}
}
/*
* Filter disassembly output if the output radix is not gdb's default 10
*/
static int
s390x_dis_filter(ulong vaddr, char *inbuf, unsigned int output_radix)
{
char buf1[BUFSIZE];
char buf2[BUFSIZE];
char *colon, *p1;
int argc;
char *argv[MAXARGS];
ulong value;
if (!inbuf)
return TRUE;
/*
* For some reason gdb can go off into the weeds translating text addresses,
* so this routine both fixes the references as well as imposing the current
* output radix on the translations.
*/
console("IN: %s", inbuf);
colon = strstr(inbuf, ":");
if (colon) {
sprintf(buf1, "0x%lx <%s>", vaddr,
value_to_symstr(vaddr, buf2, output_radix));
sprintf(buf2, "%s%s", buf1, colon);
strcpy(inbuf, buf2);
}
strcpy(buf1, inbuf);
argc = parse_line(buf1, argv);
if ((FIRSTCHAR(argv[argc-1]) == '<') &&
(LASTCHAR(argv[argc-1]) == '>')) {
p1 = rindex(inbuf, '<');
while ((p1 > inbuf) &&
!(STRNEQ(p1, " 0x") || STRNEQ(p1, "\t0x") || STRNEQ(p1, ",0x")))
p1--;
if (!(STRNEQ(p1, " 0x") || STRNEQ(p1, "\t0x") || STRNEQ(p1, ",0x")))
return FALSE;
p1++;
if (!extract_hex(p1, &value, NULLCHAR, TRUE))
return FALSE;
sprintf(buf1, "0x%lx <%s>\n", value,
value_to_symstr(value, buf2, output_radix));
sprintf(p1, "%s", buf1);
}
console(" %s", inbuf);
return TRUE;
}
/*
* Override smp_num_cpus if possible and necessary.
*/
int
s390x_get_smp_cpus(void)
{
return MAX(get_cpus_online(), get_highest_cpu_online()+1);
}
/*
* Machine dependent command.
*/
void
s390x_cmd_mach(void)
{
int c;
while ((c = getopt(argcnt, args, "cm")) != EOF) {
switch(c)
{
case 'c':
fprintf(fp,"'-c' option is not implemented on this architecture\n");
return;
case 'm':
fprintf(fp,"'-m' option is not implemented on this architecture\n");
return;
default:
argerrs++;
break;
}
}
if (argerrs)
cmd_usage(pc->curcmd, SYNOPSIS);
s390x_display_machine_stats();
}
/*
* "mach" command output.
*/
static void
s390x_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", kt->cpus);
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, " L1 CACHE SIZE: %d\n", l1_cache_size());
fprintf(fp, "KERNEL VIRTUAL BASE: %lx\n", machdep->kvbase);
fprintf(fp, "KERNEL VMALLOC BASE: %lx\n", vt->vmalloc_start);
fprintf(fp, " KERNEL STACK SIZE: %ld\n", STACKSIZE());
}
static const char *hook_files[] = {
"arch/s390x/kernel/entry.S",
"arch/s390x/kernel/head.S"
};
#define ENTRY_S ((char **)&hook_files[0])
#define HEAD_S ((char **)&hook_files[1])
static struct line_number_hook s390x_line_number_hooks[] = {
{"startup",HEAD_S},
{"_stext",HEAD_S},
{"_pstart",HEAD_S},
{"system_call",ENTRY_S},
{"sysc_do_svc",ENTRY_S},
{"sysc_do_restart",ENTRY_S},
{"sysc_return",ENTRY_S},
{"sysc_sigpending",ENTRY_S},
{"sysc_restart",ENTRY_S},
{"sysc_singlestep",ENTRY_S},
{"sysc_tracesys",ENTRY_S},
{"ret_from_fork",ENTRY_S},
{"pgm_check_handler",ENTRY_S},
{"io_int_handler",ENTRY_S},
{"io_return",ENTRY_S},
{"ext_int_handler",ENTRY_S},
{"mcck_int_handler",ENTRY_S},
{"mcck_return",ENTRY_S},
{"restart_int_handler",ENTRY_S},
{NULL, NULL} /* list must be NULL-terminated */
};
static void
s390x_dump_line_number(ulong callpc)
{
int retries;
char buf[BUFSIZE], *p;
retries = 0;
try_closest:
get_line_number(callpc, buf, FALSE);
if (strlen(buf)) {
if (retries) {
p = strstr(buf, ": ");
if (p)
*p = NULLCHAR;
}
fprintf(fp, " %s\n", buf);
} else {
if (retries) {
fprintf(fp, GDB_PATCHED() ?
"" : " (cannot determine file and line number)\n");
} else {
retries++;
callpc = closest_symbol_value(callpc);
goto try_closest;
}
}
}
static int
s390x_get_kvaddr_ranges(struct vaddr_range *vrp)
{
int cnt;
physaddr_t phys1, phys2;
ulong pp1, pp2;
cnt = 0;
vrp[cnt].type = KVADDR_UNITY_MAP;
vrp[cnt].start = machdep->kvbase;
vrp[cnt++].end = vt->high_memory;
vrp[cnt].type = KVADDR_VMALLOC;
vrp[cnt].start = first_vmalloc_address();
vrp[cnt++].end = last_vmalloc_address();
phys1 = (physaddr_t)(0);
phys2 = (physaddr_t)VTOP(vt->high_memory - PAGESIZE());
if (phys_to_page(phys1, &pp1) &&
phys_to_page(phys2, &pp2) &&
(pp1 >= vrp[cnt-1].end)) {
vrp[cnt].type = KVADDR_VMEMMAP;
vrp[cnt].start = pp1;
vrp[cnt++].end = pp2;
}
return cnt;
}
#endif /* S390X */