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s390.c
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s390.c
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/* s390.c - core analysis suite
*
* Copyright (C) 2001, 2002 Mission Critical Linux, Inc.
* Copyright (C) 2002-2006, 2009-2010, 2012-2014 David Anderson
* Copyright (C) 2002-2006, 2009-2010, 2012-2014 Red Hat, Inc. All rights reserved.
* Copyright (C) 2005, 2006, 2010 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 S390
#include "defs.h"
#define S390_WORD_SIZE 4
#define S390_ADDR_MASK 0x7fffffff
#define S390_PMD_BASE_MASK (~((1UL<<6)-1))
#define S390_PT_BASE_MASK S390_PMD_BASE_MASK
#define S390_PAGE_BASE_MASK (~((1UL<<12)-1))
/* Flags used in entries of page dirs and page tables.
*/
#define S390_PAGE_PRESENT 0x001 /* set: loaded in physical memory
* clear: not loaded in physical mem */
#define S390_RO_S390 0x200 /* HW read-only */
#define S390_PAGE_INVALID 0x400 /* HW invalid */
#define S390_PAGE_INVALID_MASK 0x601ULL /* for linux 2.6 */
#define S390_PAGE_INVALID_NONE 0x401ULL /* for linux 2.6 */
#define S390_PTE_INVALID_MASK 0x80000900
#define S390_PTE_INVALID(x) ((x) & S390_PTE_INVALID_MASK)
#define INT_STACK_SIZE STACKSIZE() // can be 4096 or 8192
#define KERNEL_STACK_SIZE STACKSIZE() // can be 4096 or 8192
#define LOWCORE_SIZE 4096
/*
* declarations of static functions
*/
static void s390_print_lowcore(char*, struct bt_info*,int);
static int s390_kvtop(struct task_context *, ulong, physaddr_t *, int);
static int s390_uvtop(struct task_context *, ulong, physaddr_t *, int);
static int s390_vtop(unsigned long, ulong, physaddr_t*, int);
static ulong s390_vmalloc_start(void);
static int s390_is_task_addr(ulong);
static int s390_verify_symbol(const char *, ulong, char type);
static ulong s390_get_task_pgd(ulong);
static int s390_translate_pte(ulong, void *, ulonglong);
static ulong s390_processor_speed(void);
static int s390_eframe_search(struct bt_info *);
static void s390_back_trace_cmd(struct bt_info *);
static void s390_get_stack_frame(struct bt_info *, ulong *, ulong *);
static int s390_dis_filter(ulong, char *, unsigned int);
static void s390_cmd_mach(void);
static int s390_get_smp_cpus(void);
static void s390_display_machine_stats(void);
static void s390_dump_line_number(ulong);
static struct line_number_hook s390_line_number_hooks[];
static int s390_is_uvaddr(ulong, struct task_context *);
/*
* struct lowcore name (old: "_lowcore", new: "lowcore")
*/
static char *lc_struct;
/*
* Initialize member offsets
*/
static void s390_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");
}
/*
* Do all necessary machine-specific setup here. This is called several
* times during initialization.
*/
void
s390_init(int when)
{
switch (when)
{
case PRE_SYMTAB:
machdep->verify_symbol = s390_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 = machdep->pagesize * 2;
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->ptrs_per_pgd = PTRS_PER_PGD;
break;
case PRE_GDB:
machdep->kvbase = 0;
machdep->identity_map_base = 0;
machdep->is_kvaddr = generic_is_kvaddr;
machdep->is_uvaddr = s390_is_uvaddr;
machdep->eframe_search = s390_eframe_search;
machdep->back_trace = s390_back_trace_cmd;
machdep->processor_speed = s390_processor_speed;
machdep->uvtop = s390_uvtop;
machdep->kvtop = s390_kvtop;
machdep->get_task_pgd = s390_get_task_pgd;
machdep->get_stack_frame = s390_get_stack_frame;
machdep->get_stackbase = generic_get_stackbase;
machdep->get_stacktop = generic_get_stacktop;
machdep->translate_pte = s390_translate_pte;
machdep->memory_size = generic_memory_size;
machdep->is_task_addr = s390_is_task_addr;
machdep->dis_filter = s390_dis_filter;
machdep->cmd_mach = s390_cmd_mach;
machdep->get_smp_cpus = s390_get_smp_cpus;
machdep->line_number_hooks = s390_line_number_hooks;
machdep->value_to_symbol = generic_machdep_value_to_symbol;
machdep->init_kernel_pgd = NULL;
vt->flags |= COMMON_VADDR;
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 = s390_vmalloc_start;
machdep->dump_irq = generic_dump_irq;
if (!machdep->hz)
machdep->hz = HZ;
machdep->section_size_bits = _SECTION_SIZE_BITS;
machdep->max_physmem_bits = _MAX_PHYSMEM_BITS;
s390_offsets_init();
break;
case POST_INIT:
break;
}
}
/*
* Dump machine dependent information
*/
void
s390_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",
(ulonglong)machdep->memsize, (ulonglong)machdep->memsize);
fprintf(fp, " bits: %d\n", machdep->bits);
fprintf(fp, " nr_irqs: %d\n", machdep->nr_irqs);
fprintf(fp, " eframe_search: s390_eframe_search()\n");
fprintf(fp, " back_trace: s390_back_trace_cmd()\n");
fprintf(fp, " processor_speed: s390_processor_speed()\n");
fprintf(fp, " uvtop: s390_uvtop()\n");
fprintf(fp, " kvtop: s390_kvtop()\n");
fprintf(fp, " get_task_pgd: s390_get_task_pgd()\n");
fprintf(fp, " dump_irq: generic_dump_irq()\n");
fprintf(fp, " get_stack_frame: s390_get_stack_frame()\n");
fprintf(fp, " get_stackbase: generic_get_stackbase()\n");
fprintf(fp, " get_stacktop: generic_get_stacktop()\n");
fprintf(fp, " translate_pte: s390_translate_pte()\n");
fprintf(fp, " memory_size: generic_memory_size()\n");
fprintf(fp, " vmalloc_start: s390_vmalloc_start()\n");
fprintf(fp, " is_task_addr: s390_is_task_addr()\n");
fprintf(fp, " verify_symbol: s390_verify_symbol()\n");
fprintf(fp, " dis_filter: s390_dis_filter()\n");
fprintf(fp, " cmd_mach: s390_cmd_mach()\n");
fprintf(fp, " get_smp_cpus: s390_get_smp_cpus()\n");
fprintf(fp, " is_kvaddr: generic_is_kvaddr()\n");
fprintf(fp, " is_uvaddr: s390_is_uvaddr()\n");
fprintf(fp, " verify_paddr: generic_verify_paddr()\n");
fprintf(fp, " init_kernel_pgd: NULL\n");
fprintf(fp, " value_to_symbol: generic_machdep_value_to_symbol()\n");
fprintf(fp, " line_number_hooks: s390_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
s390_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
s390_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 s390_vtop(pgd_base, vaddr, paddr, verbose);
}
/*
* Translates a kernel virtual address to its physical address
*/
static int
s390_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 s390_vtop(pgd_base, vaddr, paddr, verbose);
}
/*
* Check if page is mapped
*/
static inline int
s390_pte_present(unsigned long x)
{
if(THIS_KERNEL_VERSION >= LINUX(2,6,0)) {
return !((x) & S390_PAGE_INVALID) ||
((x) & S390_PAGE_INVALID_MASK)==S390_PAGE_INVALID_NONE;
} else {
return((x) & S390_PAGE_PRESENT);
}
}
/*
* page table traversal functions
*/
/* Segment table traversal function */
static ulong _kl_sg_table_deref_s390(ulong vaddr, ulong table, int len)
{
ulong offset, entry;
offset = ((vaddr >> 20) & 0x7ffUL) * 4;
if (offset >= (len + 1)*64)
/* Offset is over the table limit. */
return 0;
readmem(table + offset, KVADDR, &entry, sizeof(entry), "entry",
FAULT_ON_ERROR);
/*
* Check if the segment table entry could be read and doesn't have
* any of the reserved bits set.
*/
if (entry & 0x80000000UL)
return 0;
/* Check if the segment table entry has the invalid bit set. */
if (entry & 0x40UL)
return 0;
/* Segment table entry is valid and well formed. */
return entry;
}
/* Page table traversal function */
static ulong _kl_pg_table_deref_s390(ulong vaddr, ulong table, int len)
{
ulong offset, entry;
offset = ((vaddr >> 12) & 0xffUL) * 4;
if (offset >= (len + 1)*64)
/* Offset is over the table limit. */
return 0;
readmem(table + offset, KVADDR, &entry, sizeof(entry), "entry",
FAULT_ON_ERROR);
/*
* Check if the page table entry could be read and doesn't have
* any of the reserved bits set.
*/
if (entry & 0x80000900UL)
return 0;
/* Check if the page table entry has the invalid bit set. */
if (entry & 0x400UL)
return 0;
/* Page table entry is valid and well formed. */
return entry;
}
/* lookup virtual address in page tables */
static int
s390_vtop(unsigned long table, ulong vaddr, physaddr_t *phys_addr, int verbose)
{
ulong entry, paddr;
int len;
/*
* Get the segment table entry.
* We assume that the segment table length field in the asce
* is set to the maximum value of 127 (which translates to
* a segment table with 2048 entries) and that the addressing
* mode is 31 bit.
*/
entry = _kl_sg_table_deref_s390(vaddr, table, 127);
if (!entry)
return FALSE;
table = entry & 0x7ffffc00UL;
len = entry & 0xfUL;
/* Get the page table entry */
entry = _kl_pg_table_deref_s390(vaddr, table, len);
if (!entry)
return FALSE;
/* Isolate the page origin from the page table entry. */
paddr = entry & 0x7ffff000UL;
/* Add the page offset and return the final value. */
*phys_addr = paddr + (vaddr & 0xfffUL);
return TRUE;
}
/*
* Determine where vmalloc'd memory starts.
*/
static ulong
s390_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
s390_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
s390_processor_speed(void)
{
return 0;
}
/*
* Accept or reject a symbol from the kernel namelist.
*/
static int
s390_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;
if (STREQ(name, ".rodata"))
return TRUE;
/* 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
s390_get_task_pgd(ulong task)
{
return (error(FATAL, "s390_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
s390_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(S390_PTE_INVALID(pte)){
fprintf(fp,"PTE is invalid\n");
return FALSE;
}
if(physaddr)
*((ulong *)physaddr) = pte & S390_PAGE_BASE_MASK;
if(!s390_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 %08lx",pte, pte & S390_PAGE_BASE_MASK);
fprintf(fp," (");
if(pte & S390_PAGE_INVALID)
fprintf(fp,"INVALID ");
if(pte & S390_RO_S390)
fprintf(fp,"PROTECTION");
fprintf(fp,")");
return TRUE;
}
/*
* Look for likely exception frames in a stack.
*/
static int
s390_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"));
}
/*
* returns cpu number of task
*/
static int
s390_cpu_of_task(unsigned long task)
{
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 {
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;
}
/*
* returns true, if task of bt currently is executed by a cpu
*/
static int
s390_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
s390_get_lowcore(int cpu, char* lowcore)
{
unsigned long lowcore_array,lowcore_ptr;
lowcore_array = symbol_value("lowcore_ptr");
readmem(lowcore_array + cpu * S390_WORD_SIZE,KVADDR,
&lowcore_ptr, sizeof(long), "lowcore_ptr", FAULT_ON_ERROR);
readmem(lowcore_ptr, KVADDR, lowcore, LOWCORE_SIZE, "lowcore",
FAULT_ON_ERROR);
}
/*
* Read interrupt stack (either "async_stack" or "panic_stack");
*/
static void s390_get_int_stack(char *stack_name, char* lc, char* int_stack,
unsigned long* start, unsigned long* end)
{
unsigned long stack_addr;
if (!MEMBER_EXISTS(lc_struct, stack_name))
return;
stack_addr = ULONG(lc + MEMBER_OFFSET(lc_struct, stack_name));
if (stack_addr == 0)
return;
readmem(stack_addr - INT_STACK_SIZE, KVADDR, int_stack,
INT_STACK_SIZE, stack_name, FAULT_ON_ERROR);
*start = stack_addr - INT_STACK_SIZE;
*end = stack_addr;
}
/*
* Unroll a kernel stack.
*/
static void
s390_back_trace_cmd(struct bt_info *bt)
{
char* stack;
char async_stack[INT_STACK_SIZE];
char panic_stack[INT_STACK_SIZE];
long ksp,backchain,old_backchain;
int i=0, r14_offset,bc_offset,r14, skip_first_frame=0;
unsigned long async_start = 0, async_end = 0;
unsigned long panic_start = 0, panic_end = 0;
unsigned long stack_end, stack_start, stack_base;
char buf[BUFSIZE];
int cpu = bt->tc->processor;
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;
}
ksp = bt->stkptr;
/* print lowcore and get async stack when task has cpu */
if(s390_has_cpu(bt)){
char lowcore[LOWCORE_SIZE];
unsigned long psw_flags;
int cpu = s390_cpu_of_task(bt->task);
if (ACTIVE()) {
fprintf(fp,"(active)\n");
return;
}
s390_get_lowcore(cpu,lowcore);
psw_flags = ULONG(lowcore + OFFSET(s390_lowcore_psw_save_area));
if(psw_flags & 0x10000UL){
fprintf(fp,"Task runs in userspace\n");
s390_print_lowcore(lowcore,bt,0);
return;
}
s390_get_int_stack("async_stack", lowcore, async_stack,
&async_start, &async_end);
s390_get_int_stack("panic_stack", lowcore, panic_stack,
&panic_start, &panic_end);
s390_print_lowcore(lowcore,bt,1);
fprintf(fp,"\n");
skip_first_frame=1;
}
/* get task stack start and end */
if(THIS_KERNEL_VERSION >= LINUX(2,6,0)){
readmem(bt->task + OFFSET(task_struct_thread_info),KVADDR,
&stack_start, sizeof(long), "thread info",
FAULT_ON_ERROR);
} else {
stack_start = bt->task;
}
stack_end = stack_start + KERNEL_STACK_SIZE;
if(!STRUCT_EXISTS("stack_frame")){
r14_offset = 56;
bc_offset=0;
} else {
r14_offset = MEMBER_OFFSET("stack_frame","gprs") +
8 * S390_WORD_SIZE;
bc_offset = MEMBER_OFFSET("stack_frame","back_chain");
}
backchain = ksp;
do {
unsigned long r14_stack_off;
struct load_module *lm;
int j;
ulong offset;
char *name_plus_offset;
struct syment *sp;
/* Find stack: Either async, panic stack or task stack */
if((backchain > stack_start) && (backchain < stack_end)){
stack = bt->stackbuf;
stack_base = stack_start;
} else if((backchain > async_start) && (backchain < async_end)
&& s390_has_cpu(bt)){
stack = async_stack;
stack_base = async_start;
} else if((backchain > panic_start) && (backchain < panic_end)
&& s390_has_cpu(bt)){
stack = panic_stack;
stack_base = panic_start;
} else {
/* invalid stackframe */
break;
}
r14_stack_off=backchain - stack_base + r14_offset;
r14 = ULONG(&stack[r14_stack_off]) & S390_ADDR_MASK;
/* print function name */
if(BT_REFERENCE_CHECK(bt)){
if(bt->ref->cmdflags & BT_REF_HEXVAL){
if(r14 == bt->ref->hexval)
bt->ref->cmdflags |= BT_REF_FOUND;
} else {
if(STREQ(closest_symbol(r14),bt->ref->str))
bt->ref->cmdflags |= BT_REF_FOUND;
}
} else if(skip_first_frame){
skip_first_frame=0;
} else {
fprintf(fp," #%i [%08lx] ",i,backchain);
name_plus_offset = NULL;
if (bt->flags & BT_SYMBOL_OFFSET) {
sp = value_search(r14, &offset);
if (sp && offset)
name_plus_offset =
value_to_symstr(r14, buf, bt->radix);
}
fprintf(fp,"%s at %x", name_plus_offset ?
name_plus_offset : closest_symbol(r14), r14);
if (module_symbol(r14, NULL, &lm, NULL, 0))
fprintf(fp, " [%s]", lm->mod_name);
fprintf(fp, "\n");
if (bt->flags & BT_LINE_NUMBERS)
s390_dump_line_number(r14);
i++;
}
old_backchain=backchain;
backchain = ULONG(&stack[backchain - stack_base + bc_offset]);
/* print stack content if -f is specified */
if((bt->flags & BT_FULL) && !BT_REFERENCE_CHECK(bt)){
int frame_size;
if(backchain == 0){
frame_size = stack_base - old_backchain
+ KERNEL_STACK_SIZE;
} else {
frame_size = MIN((backchain - old_backchain),
(stack_base - old_backchain +
KERNEL_STACK_SIZE));
}
for(j=0; j< frame_size; j+=4){
if(j % 16 == 0){
fprintf(fp,"\n%08lx: ",old_backchain+j);
}
fprintf(fp," %s", format_stack_entry(bt, buf,
ULONG(&stack[old_backchain - stack_base + j]), 0));
}
fprintf(fp,"\n\n");
}
/* Check for interrupt stackframe */
if((backchain == 0) && (stack == async_stack)){
unsigned long psw_flags,r15;
psw_flags = ULONG(&stack[old_backchain - stack_base
+96 +MEMBER_OFFSET("pt_regs","psw")]);
if(psw_flags & 0x10000UL){
/* User psw: should not happen */
break;
}
r15 = ULONG(&stack[old_backchain - stack_base +
96 + MEMBER_OFFSET("pt_regs",
"gprs") + 15 * S390_WORD_SIZE]);
backchain=r15;
fprintf(fp," - Interrupt -\n");
}
} while(backchain != 0);
}
/*
* print lowcore info (psw and all registers)
*/
static void
s390_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 + S390_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 : %#010lx %#010lx\n", tmp[0],
tmp[1]);
if(show_symbols){
fprintf(fp," -function : %s at %lx\n",
closest_symbol(tmp[1] & S390_ADDR_MASK),
tmp[1] & S390_ADDR_MASK);
if (bt->flags & BT_LINE_NUMBERS)
s390_dump_line_number(tmp[1] & S390_ADDR_MASK);
}
ptr = lc + MEMBER_OFFSET(lc_struct, "cpu_timer_save_area");
tmp[0]=UINT(ptr);
tmp[1]=UINT(ptr + S390_WORD_SIZE);
fprintf(fp," -cpu timer: %#010lx %#010lx\n", tmp[0],tmp[1]);
ptr = lc + MEMBER_OFFSET(lc_struct, "clock_comp_save_area");
tmp[0]=UINT(ptr);
tmp[1]=UINT(ptr + S390_WORD_SIZE);
fprintf(fp," -clock cmp: %#010lx %#010lx\n", tmp[0], tmp[1]);
fprintf(fp," -general registers:\n");
ptr = lc + MEMBER_OFFSET(lc_struct, "gpregs_save_area");
tmp[0]=ULONG(ptr);
tmp[1]=ULONG(ptr + S390_WORD_SIZE);
tmp[2]=ULONG(ptr + 2 * S390_WORD_SIZE);
tmp[3]=ULONG(ptr + 3 * S390_WORD_SIZE);
fprintf(fp," %#010lx %#010lx %#010lx %#010lx\n",
tmp[0],tmp[1],tmp[2],tmp[3]);
tmp[0]=ULONG(ptr + 4 * S390_WORD_SIZE);
tmp[1]=ULONG(ptr + 5 * S390_WORD_SIZE);
tmp[2]=ULONG(ptr + 6 * S390_WORD_SIZE);
tmp[3]=ULONG(ptr + 7 * S390_WORD_SIZE);
fprintf(fp," %#010lx %#010lx %#010lx %#010lx\n",
tmp[0],tmp[1],tmp[2],tmp[3]);
tmp[0]=ULONG(ptr + 8 * S390_WORD_SIZE);
tmp[1]=ULONG(ptr + 9 * S390_WORD_SIZE);
tmp[2]=ULONG(ptr + 10* S390_WORD_SIZE);
tmp[3]=ULONG(ptr + 11* S390_WORD_SIZE);
fprintf(fp," %#010lx %#010lx %#010lx %#010lx\n",
tmp[0],tmp[1],tmp[2],tmp[3]);
tmp[0]=ULONG(ptr + 12* S390_WORD_SIZE);
tmp[1]=ULONG(ptr + 13* S390_WORD_SIZE);
tmp[2]=ULONG(ptr + 14* S390_WORD_SIZE);
tmp[3]=ULONG(ptr + 15* S390_WORD_SIZE);
fprintf(fp," %#010lx %#010lx %#010lx %#010lx\n",
tmp[0], tmp[1], tmp[2], tmp[3]);
fprintf(fp," -access registers:\n");
ptr = lc + MEMBER_OFFSET(lc_struct, "access_regs_save_area");
tmp[0]=ULONG(ptr);
tmp[1]=ULONG(ptr + S390_WORD_SIZE);
tmp[2]=ULONG(ptr + 2 * S390_WORD_SIZE);
tmp[3]=ULONG(ptr + 3 * S390_WORD_SIZE);
fprintf(fp," %#010lx %#010lx %#010lx %#010lx\n",
tmp[0], tmp[1], tmp[2], tmp[3]);
tmp[0]=ULONG(ptr + 4 * S390_WORD_SIZE);
tmp[1]=ULONG(ptr + 5 * S390_WORD_SIZE);
tmp[2]=ULONG(ptr + 6 * S390_WORD_SIZE);
tmp[3]=ULONG(ptr + 7 * S390_WORD_SIZE);
fprintf(fp," %#010lx %#010lx %#010lx %#010lx\n",
tmp[0], tmp[1], tmp[2], tmp[3]);
tmp[0]=ULONG(ptr + 8 * S390_WORD_SIZE);
tmp[1]=ULONG(ptr + 9 * S390_WORD_SIZE);
tmp[2]=ULONG(ptr + 10* S390_WORD_SIZE);
tmp[3]=ULONG(ptr + 11* S390_WORD_SIZE);
fprintf(fp," %#010lx %#010lx %#010lx %#010lx\n",
tmp[0], tmp[1], tmp[2], tmp[3]);
tmp[0]=ULONG(ptr + 12* S390_WORD_SIZE);
tmp[1]=ULONG(ptr + 13* S390_WORD_SIZE);
tmp[2]=ULONG(ptr + 14* S390_WORD_SIZE);
tmp[3]=ULONG(ptr + 15* S390_WORD_SIZE);
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 + S390_WORD_SIZE);
tmp[2]=ULONG(ptr + 2 * S390_WORD_SIZE);
tmp[3]=ULONG(ptr + 3 * S390_WORD_SIZE);
fprintf(fp," %#010lx %#010lx %#010lx %#010lx\n",
tmp[0], tmp[1], tmp[2], tmp[3]);
tmp[0]=ULONG(ptr + 4 * S390_WORD_SIZE);
tmp[1]=ULONG(ptr + 5 * S390_WORD_SIZE);
tmp[2]=ULONG(ptr + 6 * S390_WORD_SIZE);
tmp[3]=ULONG(ptr + 7 * S390_WORD_SIZE);
fprintf(fp," %#010lx %#010lx %#010lx %#010lx\n",
tmp[0], tmp[1], tmp[2], tmp[3]);
tmp[0]=ULONG(ptr + 8 * S390_WORD_SIZE);
tmp[1]=ULONG(ptr + 9 * S390_WORD_SIZE);
tmp[2]=ULONG(ptr + 10 * S390_WORD_SIZE);
tmp[3]=ULONG(ptr + 11 * S390_WORD_SIZE);
fprintf(fp," %#010lx %#010lx %#010lx %#010lx\n",
tmp[0], tmp[1], tmp[2], tmp[3]);
tmp[0]=ULONG(ptr + 12 * S390_WORD_SIZE);
tmp[1]=ULONG(ptr + 13 * S390_WORD_SIZE);
tmp[2]=ULONG(ptr + 14 * S390_WORD_SIZE);
tmp[3]=ULONG(ptr + 15 * S390_WORD_SIZE);
fprintf(fp," %#010lx %#010lx %#010lx %#010lx\n",
tmp[0], tmp[1], tmp[2], tmp[3]);
ptr = lc + MEMBER_OFFSET(lc_struct, "floating_pt_save_area");
fprintf(fp," -floating point registers 0,2,4,6:\n");
tmp[0]=ULONG(ptr);
tmp[1]=ULONG(ptr + 2 * S390_WORD_SIZE);
tmp[2]=ULONG(ptr + 4 * S390_WORD_SIZE);
tmp[3]=ULONG(ptr + 6 * S390_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
s390_get_stack_frame(struct bt_info *bt, ulong *eip, ulong *esp)
{
unsigned long ksp, r14;
int r14_offset;
char lowcore[LOWCORE_SIZE];
if(s390_has_cpu(bt))
s390_get_lowcore(s390_cpu_of_task(bt->task),lowcore);
/* get the stack pointer */
if(esp){
if(s390_has_cpu(bt)){
ksp = ULONG(lowcore + MEMBER_OFFSET(lc_struct,
"gpregs_save_area") + (15 * S390_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(s390_has_cpu(bt) && esp){
*eip = ULONG(lowcore + OFFSET(s390_lowcore_psw_save_area) +
S390_WORD_SIZE) & S390_ADDR_MASK;
} else {
if(!STRUCT_EXISTS("stack_frame")){
r14_offset = 56;
} else {
r14_offset = MEMBER_OFFSET("stack_frame","gprs") +
8 * S390_WORD_SIZE;
}
readmem(ksp + r14_offset,KVADDR,&r14,sizeof(void*),"eip",
FAULT_ON_ERROR);
*eip=r14 & S390_ADDR_MASK;
}
}
/*
* Filter disassembly output if the output radix is not gdb's default 10
*/
static int
s390_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]) == '<') &&