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s390x.c
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s390x.c
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/* 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. */