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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
#define S390X_LC_OS_INFO 0xe18
/*
* 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);
static ulong s390x_generic_VTOP(ulong vaddr);
static ulong s390x_generic_PTOV(ulong paddr);
static int s390x_generic_IS_VMALLOC_ADDR(ulong vaddr);
static ulong s390x_vr_VTOP(ulong vaddr);
static ulong s390x_vr_PTOV(ulong paddr);
static int s390x_vr_IS_VMALLOC_ADDR(ulong vaddr);
static int s390x_vr_is_kvaddr(ulong);
struct machine_specific s390x_machine_specific = {
.virt_to_phys = s390x_generic_VTOP,
.phys_to_virt = s390x_generic_PTOV,
.is_vmalloc_addr = s390x_generic_IS_VMALLOC_ADDR,
};
/*
* 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 == VTOP(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);
}
#define OS_INFO_VERSION_MAJOR 1
#define OS_INFO_VERSION_MINOR 1
#define OS_INFO_VMCOREINFO 0
#define OS_INFO_REIPL_BLOCK 1
#define OS_INFO_FLAGS_ENTRY 2
#define OS_INFO_RESERVED 3
#define OS_INFO_IDENTITY_BASE 4
#define OS_INFO_KASLR_OFFSET 5
#define OS_INFO_KASLR_OFF_PHYS 6
#define OS_INFO_VMEMMAP 7
#define OS_INFO_AMODE31_START 8
#define OS_INFO_AMODE31_END 9
struct os_info_entry {
union {
__u64 addr;
__u64 val;
};
__u64 size;
__u32 csum;
} __attribute__((packed));
struct os_info {
__u64 magic;
__u32 csum;
__u16 version_major;
__u16 version_minor;
__u64 crashkernel_addr;
__u64 crashkernel_size;
struct os_info_entry entry[10];
__u8 reserved[3864];
} __attribute__((packed));
struct vm_info {
__u64 __identity_base;
__u64 __kaslr_offset;
__u64 __kaslr_offset_phys;
__u64 amode31_start;
__u64 amode31_end;
};
static bool
vmcoreinfo_read_u64(const char *key, __u64 *val)
{
char *string;
string = pc->read_vmcoreinfo(key);
if (string) {
*val = strtoul(string, NULL, 16);
free(string);
return true;
}
return false;
}
static bool vmcoreinfo_read_vm_info(struct vm_info *_vm_info)
{
struct vm_info vm_info;
if (!vmcoreinfo_read_u64("IDENTITYBASE", &vm_info.__identity_base) ||
!vmcoreinfo_read_u64("KERNELOFFSET", &vm_info.__kaslr_offset) ||
!vmcoreinfo_read_u64("KERNELOFFPHYS", &vm_info.__kaslr_offset_phys) ||
!vmcoreinfo_read_u64("SAMODE31", &vm_info.amode31_start) ||
!vmcoreinfo_read_u64("EAMODE31", &vm_info.amode31_end))
return false;
*_vm_info = vm_info;
return true;
}
static bool os_info_read_vm_info(struct vm_info *vm_info)
{
struct os_info os_info;
ulong addr;
if (!readmem(S390X_LC_OS_INFO, PHYSADDR, &addr,
sizeof(addr), "s390x os_info ptr",
QUIET|RETURN_ON_ERROR))
return false;
if (addr == 0)
return true;
if (!readmem(addr, PHYSADDR, &os_info,
offsetof(struct os_info, reserved), "s390x os_info header",
QUIET|RETURN_ON_ERROR))
return false;
vm_info->__identity_base = os_info.entry[OS_INFO_IDENTITY_BASE].val;
vm_info->__kaslr_offset = os_info.entry[OS_INFO_KASLR_OFFSET].val;
vm_info->__kaslr_offset_phys = os_info.entry[OS_INFO_KASLR_OFF_PHYS].val;
vm_info->amode31_start = os_info.entry[OS_INFO_AMODE31_START].val;
vm_info->amode31_end = os_info.entry[OS_INFO_AMODE31_END].val;
return true;
}
static bool vm_info_empty(struct vm_info *vm_info)
{
return !vm_info->__kaslr_offset;
}
static bool s390x_init_vm(void)
{
struct vm_info vm_info;
if (pc->flags & PROC_KCORE) {
if (!vmcoreinfo_read_vm_info(&vm_info))
return true;
} else {
if (!os_info_read_vm_info(&vm_info))
return false;
}
if (vm_info_empty(&vm_info))
return true;
machdep->identity_map_base = vm_info.__identity_base;
machdep->kvbase = vm_info.__kaslr_offset;
machdep->machspec->__kaslr_offset_phys = vm_info.__kaslr_offset_phys;
machdep->machspec->amode31_start = vm_info.amode31_start;
machdep->machspec->amode31_end = vm_info.amode31_end;
machdep->is_kvaddr = s390x_vr_is_kvaddr;
machdep->machspec->virt_to_phys = s390x_vr_VTOP;
machdep->machspec->phys_to_virt = s390x_vr_PTOV;
machdep->machspec->is_vmalloc_addr = s390x_vr_IS_VMALLOC_ADDR;
return true;
}
static ulong s390x_generic_VTOP(ulong vaddr)
{
return vaddr - machdep->kvbase;
}
static ulong s390x_generic_PTOV(ulong paddr)
{
return paddr + machdep->kvbase;
}
static int s390x_generic_IS_VMALLOC_ADDR(ulong vaddr)
{
return vt->vmalloc_start && vaddr >= vt->vmalloc_start;
}
static ulong s390x_vr_VTOP(ulong vaddr)
{
if (vaddr < LOWCORE_SIZE)
return vaddr;
if ((vaddr < machdep->machspec->amode31_end) &&
(vaddr >= machdep->machspec->amode31_start))
return vaddr;
if (vaddr < machdep->kvbase)
return vaddr - machdep->identity_map_base;
return vaddr - machdep->kvbase + machdep->machspec->__kaslr_offset_phys;
}
static ulong s390x_vr_PTOV(ulong paddr)
{
return paddr + machdep->identity_map_base;
}
static int s390x_vr_IS_VMALLOC_ADDR(ulong vaddr)
{
return (vaddr >= vt->vmalloc_start && vaddr < machdep->kvbase);
}
ulong s390x_VTOP(ulong vaddr)
{
return machdep->machspec->virt_to_phys(vaddr);
}
ulong s390x_PTOV(ulong paddr)
{
return machdep->machspec->phys_to_virt(paddr);
}
int s390x_IS_VMALLOC_ADDR(ulong vaddr)
{
return machdep->machspec->is_vmalloc_addr(vaddr);
}
/*
* 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->machspec = &s390x_machine_specific;
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;
if (!s390x_init_vm())
error(FATAL, "cannot initialize VM parameters.");
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->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, " 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: %s()\n", machdep->is_kvaddr == s390x_vr_is_kvaddr ?
"s390x_vr_is_kvaddr" :
"generic_is_kvaddr");
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);
}
static int
s390x_vr_is_kvaddr(ulong vaddr)
{
return (vaddr < LOWCORE_SIZE) || (vaddr >= machdep->identity_map_base);
}
/*
* 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",