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alpha.c
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alpha.c
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/* alpha.c - core analysis suite
*
* Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc.
* Copyright (C) 2002-2006, 2010-2013 David Anderson
* Copyright (C) 2002-2006, 2010-2013 Red Hat, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#ifdef ALPHA
#include "defs.h"
static void alpha_back_trace(struct gnu_request *, struct bt_info *);
static int alpha_trace_status(struct gnu_request *, struct bt_info *);
static void alpha_exception_frame(ulong, ulong,
struct gnu_request *, struct bt_info *);
static void alpha_frame_offset(struct gnu_request *, ulong);
static int alpha_backtrace_resync(struct gnu_request *, ulong,
struct bt_info *);
static void alpha_print_stack_entry(struct gnu_request *, ulong,
char *, ulong, struct bt_info *);
static int alpha_resync_speculate(struct gnu_request *, ulong,struct bt_info *);
static int alpha_dis_filter(ulong, char *, unsigned int);
static void dis_address_translation(ulong, char *, unsigned int);
static void alpha_cmd_mach(void);
static int alpha_get_smp_cpus(void);
static void alpha_display_machine_stats(void);
static void alpha_dump_line_number(char *, ulong);
static void display_hwrpb(unsigned int);
static void alpha_post_init(void);
static struct line_number_hook alpha_line_number_hooks[];
#define ALPHA_CONTINUE_TRACE (1)
#define ALPHA_END_OF_TRACE (2)
#define ALPHA_EXCEPTION_FRAME (3)
#define ALPHA_SYSCALL_FRAME (4)
#define ALPHA_MM_FAULT (5)
#define ALPHA_INTERRUPT_PENDING (6)
#define ALPHA_RESCHEDULE (7)
#define ALPHA_DOWN_FAILED (8)
#define ALPHA_RET_FROM_SMP_FORK (9)
#define ALPHA_SIGNAL_RETURN (10)
#define ALPHA_STRACE (11)
static int alpha_eframe_search(struct bt_info *);
static int alpha_uvtop(struct task_context *, ulong, physaddr_t *, int);
static int alpha_kvtop(struct task_context *, ulong, physaddr_t *, int);
static void alpha_back_trace_cmd(struct bt_info *);
static ulong alpha_get_task_pgd(ulong task);
static ulong alpha_processor_speed(void);
static void alpha_dump_irq(int);
static void alpha_get_stack_frame(struct bt_info *, ulong *, ulong *);
static void get_alpha_frame(struct bt_info *, ulong *, ulong *);
static int verify_user_eframe(struct bt_info *, ulong, ulong);
static int alpha_translate_pte(ulong, void *, ulonglong);
static uint64_t alpha_memory_size(void);
static ulong alpha_vmalloc_start(void);
static int alpha_is_task_addr(ulong);
static int alpha_verify_symbol(const char *, ulong, char);
struct percpu_data {
ulong halt_PC;
ulong halt_ra;
ulong halt_pv;
};
#define GET_HALT_PC 0x1
#define GET_HALT_RA 0x2
#define GET_HALT_PV 0x3
static ulong get_percpu_data(int, ulong, struct percpu_data *);
/*
* Do all necessary machine-specific setup here. This is called three times,
* before symbol table initialization, and before and after GDB has been
* initialized.
*/
void
alpha_init(int when)
{
int tmp;
switch (when)
{
case PRE_SYMTAB:
machdep->verify_symbol = alpha_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 = ~(machdep->pageoffset);
machdep->stacksize = machdep->pagesize * 2;
if ((machdep->pgd = (char *)malloc(PAGESIZE())) == NULL)
error(FATAL, "cannot malloc pgd space.");
if ((machdep->pmd = (char *)malloc(PAGESIZE())) == NULL)
error(FATAL, "cannot malloc pmd space.");
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:
switch (symbol_value("_stext") & KSEG_BASE)
{
case KSEG_BASE:
machdep->kvbase = KSEG_BASE;
break;
case KSEG_BASE_48_BIT:
machdep->kvbase = KSEG_BASE_48_BIT;
break;
default:
error(FATAL,
"cannot determine KSEG base from _stext: %lx\n",
symbol_value("_stext"));
}
machdep->identity_map_base = machdep->kvbase;
machdep->is_kvaddr = generic_is_kvaddr;
machdep->is_uvaddr = generic_is_uvaddr;
machdep->eframe_search = alpha_eframe_search;
machdep->back_trace = alpha_back_trace_cmd;
machdep->processor_speed = alpha_processor_speed;
machdep->uvtop = alpha_uvtop;
machdep->kvtop = alpha_kvtop;
machdep->get_task_pgd = alpha_get_task_pgd;
if (symbol_exists("irq_desc"))
machdep->dump_irq = generic_dump_irq;
else
machdep->dump_irq = alpha_dump_irq;
machdep->get_stack_frame = alpha_get_stack_frame;
machdep->get_stackbase = generic_get_stackbase;
machdep->get_stacktop = generic_get_stacktop;
machdep->translate_pte = alpha_translate_pte;
machdep->memory_size = alpha_memory_size;
machdep->vmalloc_start = alpha_vmalloc_start;
machdep->is_task_addr = alpha_is_task_addr;
if (symbol_exists("console_crash")) {
get_symbol_data("console_crash", sizeof(int), &tmp);
if (tmp)
machdep->flags |= HWRESET;
}
machdep->dis_filter = alpha_dis_filter;
machdep->cmd_mach = alpha_cmd_mach;
machdep->get_smp_cpus = alpha_get_smp_cpus;
machdep->line_number_hooks = alpha_line_number_hooks;
machdep->value_to_symbol = generic_machdep_value_to_symbol;
machdep->init_kernel_pgd = NULL;
break;
case POST_GDB:
MEMBER_OFFSET_INIT(thread_struct_ptbr,
"thread_struct", "ptbr");
MEMBER_OFFSET_INIT(hwrpb_struct_cycle_freq,
"hwrpb_struct", "cycle_freq");
MEMBER_OFFSET_INIT(hwrpb_struct_processor_offset,
"hwrpb_struct", "processor_offset");
MEMBER_OFFSET_INIT(hwrpb_struct_processor_size,
"hwrpb_struct", "processor_size");
MEMBER_OFFSET_INIT(percpu_struct_halt_PC,
"percpu_struct", "halt_PC");
MEMBER_OFFSET_INIT(percpu_struct_halt_ra,
"percpu_struct", "halt_ra");
MEMBER_OFFSET_INIT(percpu_struct_halt_pv,
"percpu_struct", "halt_pv");
MEMBER_OFFSET_INIT(switch_stack_r26,
"switch_stack", "r26");
if (symbol_exists("irq_action"))
ARRAY_LENGTH_INIT(machdep->nr_irqs, irq_action,
"irq_action", NULL, 0);
else if (symbol_exists("irq_desc"))
ARRAY_LENGTH_INIT(machdep->nr_irqs, irq_desc,
"irq_desc", NULL, 0);
else
machdep->nr_irqs = 0;
if (!machdep->hz)
machdep->hz = HZ;
break;
case POST_INIT:
alpha_post_init();
break;
}
}
/*
* Unroll a kernel stack.
*/
static void
alpha_back_trace_cmd(struct bt_info *bt)
{
char buf[BUFSIZE];
struct gnu_request *req;
bt->flags |= BT_EXCEPTION_FRAME;
if (CRASHDEBUG(1) || bt->debug)
fprintf(fp, " => PC: %lx (%s) FP: %lx \n",
bt->instptr, value_to_symstr(bt->instptr, buf, 0),
bt->stkptr );
req = (struct gnu_request *)GETBUF(sizeof(struct gnu_request));
req->command = GNU_STACK_TRACE;
req->flags = GNU_RETURN_ON_ERROR;
req->buf = GETBUF(BUFSIZE);
req->debug = bt->debug;
req->task = bt->task;
req->pc = bt->instptr;
req->sp = bt->stkptr;
if (bt->flags & BT_USE_GDB) {
strcpy(req->buf, "backtrace");
gdb_interface(req);
}
else
alpha_back_trace(req, bt);
FREEBUF(req->buf);
FREEBUF(req);
}
/*
* Unroll the kernel stack.
*/
#define ALPHA_BACKTRACE_SPECULATE(X) \
{ \
speculate_location = X; \
\
if (bt->flags & BT_SPECULATE) \
return; \
\
BZERO(btloc, sizeof(struct bt_info)); \
btloc->task = req->task; \
btloc->tc = bt->tc; \
btloc->stackbase = bt->stackbase; \
btloc->stacktop = bt->stacktop; \
btloc->flags = BT_TEXT_SYMBOLS_NOPRINT; \
hook.eip = 0; \
hook.esp = req->lastsp ? req->lastsp + sizeof(long) : 0; \
btloc->hp = &hook; \
\
back_trace(btloc); \
\
if (hook.esp && hook.eip) { \
req->hookp = &hook; \
if (alpha_resync_speculate(req, bt->flags, bt)) { \
req->pc = hook.eip; \
req->sp = hook.esp; \
continue; \
} \
goto show_remaining_text; \
} \
goto show_remaining_text; \
}
static void
alpha_back_trace(struct gnu_request *req, struct bt_info *bt)
{
char buf[BUFSIZE];
int frame;
int done;
int status;
struct stack_hook hook;
int eframe_same_pc_ra_function;
int speculate_location;
struct bt_info bt_info, *btloc;
frame = 0;
req->curframe = 0;
btloc = &bt_info;
if (!IS_KVADDR(req->pc)) {
if (BT_REFERENCE_CHECK(bt))
return;
if ((machdep->flags & HWRESET) && is_task_active(req->task)) {
fprintf(fp, "(hardware reset while in user space)\n");
return;
}
fprintf(fp, "invalid pc: %lx\n", req->pc);
alpha_exception_frame(USER_EFRAME_ADDR(req->task),
BT_USER_EFRAME, req, bt);
return;
}
for (done = FALSE; !done && (frame < 100); frame++) {
speculate_location = 0;
if ((req->name = closest_symbol(req->pc)) == NULL) {
req->ra = req->pc = 0;
if (alpha_backtrace_resync(req,
bt->flags | BT_FROM_CALLFRAME, bt))
continue;
if (BT_REFERENCE_FOUND(bt))
return;
ALPHA_BACKTRACE_SPECULATE(1);
}
if (!INSTACK(req->sp, bt))
break;
if (!is_kernel_text(req->pc))
ALPHA_BACKTRACE_SPECULATE(2);
alpha_print_stack_entry(req, req->pc, req->name,
bt->flags | BT_SAVE_LASTSP, bt);
if (BT_REFERENCE_FOUND(bt))
return;
switch (status = alpha_trace_status(req, bt))
{
case ALPHA_CONTINUE_TRACE:
alpha_frame_offset(req, 0);
if (!req->value) {
done = TRUE;
break;
}
req->prevpc = req->pc;
req->pc = GET_STACK_ULONG(req->sp);
req->prevsp = req->sp;
req->sp += req->value;
break;
case ALPHA_END_OF_TRACE:
done = TRUE;
break;
case ALPHA_STRACE:
alpha_exception_frame(req->sp,
BT_USER_EFRAME|BT_STRACE, req, bt);
done = TRUE;
break;
case ALPHA_RET_FROM_SMP_FORK:
alpha_exception_frame(USER_EFRAME_ADDR(req->task),
BT_USER_EFRAME|BT_RET_FROM_SMP_FORK, req, bt);
done = TRUE;
break;
case ALPHA_DOWN_FAILED:
frame++;
alpha_print_stack_entry(req,
req->pc, closest_symbol(req->pc),
bt->flags | BT_SAVE_LASTSP, bt);
if (BT_REFERENCE_FOUND(bt))
return;
alpha_frame_offset(req, 0);
if (!req->value) {
done = TRUE;
break;
}
req->prevpc = req->pc;
req->pc = GET_STACK_ULONG(req->sp);
req->prevsp = req->sp;
req->sp += req->value;
break;
case ALPHA_RESCHEDULE:
alpha_exception_frame(USER_EFRAME_ADDR(req->task),
BT_USER_EFRAME|BT_RESCHEDULE, req, bt);
done = TRUE;
break;
case ALPHA_MM_FAULT:
alpha_exception_frame(req->sp, bt->flags, req, bt);
if (!IS_KVADDR(req->pc)) {
done = TRUE;
break;
}
alpha_frame_offset(req, 0);
if (!req->value) {
done = TRUE;
break;
}
frame++;
alpha_print_stack_entry(req,
req->pc, closest_symbol(req->pc),
bt->flags | BT_SAVE_LASTSP, bt);
if (BT_REFERENCE_FOUND(bt))
return;
if (!IS_KVADDR(req->pc)) {
done = TRUE;
break;
}
req->prevpc = req->pc;
req->pc = GET_STACK_ULONG(req->sp);
req->prevsp = req->sp;
req->sp += req->value;
break;
case ALPHA_SYSCALL_FRAME:
req->sp = verify_user_eframe(bt, req->task, req->sp) ?
req->sp : USER_EFRAME_ADDR(req->task);
alpha_exception_frame(req->sp, bt->flags, req, bt);
if (!IS_KVADDR(req->pc)) {
done = TRUE;
break;
}
alpha_frame_offset(req, 0);
if (!req->value) {
done = TRUE;
break;
}
req->prevpc = req->pc;
req->pc = GET_STACK_ULONG(req->sp);
req->prevsp = req->sp;
req->sp += req->value;
break;
case ALPHA_SIGNAL_RETURN:
alpha_exception_frame(USER_EFRAME_ADDR(req->task),
bt->flags, req, bt);
done = TRUE;
break;
case ALPHA_EXCEPTION_FRAME:
alpha_frame_offset(req, 0);
if (!req->value) {
fprintf(fp,
"ALPHA EXCEPTION FRAME w/no frame offset for %lx (%s)\n",
req->pc,
value_to_symstr(req->pc, buf, 0));
done = TRUE;
break;
}
alpha_exception_frame(req->sp + req->value,
bt->flags, req, bt);
if (!IS_KVADDR(req->pc)) {
done = TRUE;
break;
}
alpha_frame_offset(req, 0);
if (!req->value) {
fprintf(fp,
"ALPHA EXCEPTION FRAME w/no frame offset for %lx (%s)\n",
req->pc,
value_to_symstr(req->pc, buf, 0));
done = TRUE;
break;
}
eframe_same_pc_ra_function =
SAME_FUNCTION(req->pc, req->ra);
frame++;
alpha_print_stack_entry(req, req->pc,
closest_symbol(req->pc),
bt->flags | BT_SAVE_LASTSP, bt);
if (BT_REFERENCE_FOUND(bt))
return;
if (!IS_KVADDR(req->pc)) {
done = TRUE;
break;
}
if (STREQ(closest_symbol(req->pc),
"ret_from_reschedule")) {
alpha_exception_frame(
USER_EFRAME_ADDR(req->task),
BT_USER_EFRAME|BT_RESCHEDULE, req, bt);
done = TRUE;
break;
}
req->prevpc = req->pc;
req->pc = GET_STACK_ULONG(req->sp);
if (!is_kernel_text(req->pc)) {
if (alpha_backtrace_resync(req,
bt->flags | BT_FROM_EXCEPTION, bt))
break;
if (BT_REFERENCE_FOUND(bt))
return;
ALPHA_BACKTRACE_SPECULATE(3);
}
if (!eframe_same_pc_ra_function &&
(req->pc != req->ra)) {
req->pc = req->ra;
break;
}
req->prevsp = req->sp;
req->sp += req->value;
break;
case ALPHA_INTERRUPT_PENDING:
alpha_frame_offset(req, 0);
if (!req->value) {
req->prevpc = req->pc;
req->pc = req->addr;
req->prevsp = req->sp;
req->sp = req->frame;
} else {
req->prevpc = req->pc;
req->pc = GET_STACK_ULONG(req->sp);
req->prevsp = req->sp;
req->sp += req->value;
}
break;
}
}
return;
show_remaining_text:
if (BT_REFERENCE_CHECK(bt))
return;
BZERO(btloc, sizeof(struct bt_info));
btloc->task = req->task;
btloc->tc = bt->tc;
btloc->stackbase = bt->stackbase;
btloc->stacktop = bt->stacktop;
btloc->flags = BT_TEXT_SYMBOLS_NOPRINT;
hook.esp = req->lastsp + sizeof(long);
btloc->hp = &hook;
back_trace(btloc);
if (hook.eip) {
fprintf(fp,
"NOTE: cannot resolve trace from this point -- remaining text symbols on stack:\n");
btloc->flags = BT_TEXT_SYMBOLS_PRINT|BT_ERROR_MASK;
hook.esp = req->lastsp + sizeof(long);
back_trace(btloc);
} else
fprintf(fp,
"NOTE: cannot resolve trace from this point -- no remaining text symbols\n");
if (CRASHDEBUG(1))
fprintf(fp, "speculate_location: %d\n", speculate_location);
alpha_exception_frame(USER_EFRAME_ADDR(req->task),
BT_USER_EFRAME, req, bt);
}
/*
* print one entry of a stack trace
*/
static void
alpha_print_stack_entry(struct gnu_request *req,
ulong callpc,
char *name,
ulong flags,
struct bt_info *bt)
{
struct load_module *lm;
if (BT_REFERENCE_CHECK(bt)) {
switch (bt->ref->cmdflags & (BT_REF_SYMBOL|BT_REF_HEXVAL))
{
case BT_REF_SYMBOL:
if (STREQ(name, bt->ref->str) ||
(STREQ(name, "strace") &&
STREQ(bt->ref->str, "entSys"))) {
bt->ref->cmdflags |= BT_REF_FOUND;
}
break;
case BT_REF_HEXVAL:
if (bt->ref->hexval == callpc)
bt->ref->cmdflags |= BT_REF_FOUND;
break;
}
} else {
fprintf(fp, "%s#%d [%lx] %s at %lx",
req->curframe < 10 ? " " : "", req->curframe, req->sp,
STREQ(name, "strace") ? "strace (via entSys)" : name,
callpc);
if (module_symbol(callpc, NULL, &lm, NULL, 0))
fprintf(fp, " [%s]", lm->mod_name);
fprintf(fp, "\n");
}
if (!(flags & BT_SPECULATE))
req->curframe++;
if (flags & BT_SAVE_LASTSP)
req->lastsp = req->sp;
if (BT_REFERENCE_CHECK(bt))
return;
if (flags & BT_LINE_NUMBERS)
alpha_dump_line_number(name, callpc);
}
static const char *hook_files[] = {
"arch/alpha/kernel/entry.S",
"arch/alpha/kernel/head.S",
"init/main.c",
"arch/alpha/kernel/smp.c",
};
#define ENTRY_S ((char **)&hook_files[0])
#define HEAD_S ((char **)&hook_files[1])
#define MAIN_C ((char **)&hook_files[2])
#define SMP_C ((char **)&hook_files[3])
static struct line_number_hook alpha_line_number_hooks[] = {
{"entInt", ENTRY_S},
{"entMM", ENTRY_S},
{"entArith", ENTRY_S},
{"entIF", ENTRY_S},
{"entDbg", ENTRY_S},
{"kernel_clone", ENTRY_S},
{"kernel_thread", ENTRY_S},
{"__kernel_execve", ENTRY_S},
{"do_switch_stack", ENTRY_S},
{"undo_switch_stack", ENTRY_S},
{"entUna", ENTRY_S},
{"entUnaUser", ENTRY_S},
{"sys_fork", ENTRY_S},
{"sys_clone", ENTRY_S},
{"sys_vfork", ENTRY_S},
{"alpha_switch_to", ENTRY_S},
{"entSys", ENTRY_S},
{"ret_from_sys_call", ENTRY_S},
{"ret_from_reschedule", ENTRY_S},
{"restore_all", ENTRY_S},
{"strace", ENTRY_S},
{"strace_success", ENTRY_S},
{"strace_error", ENTRY_S},
{"syscall_error", ENTRY_S},
{"ret_success", ENTRY_S},
{"signal_return", ENTRY_S},
{"ret_from_fork", ENTRY_S},
{"reschedule", ENTRY_S},
{"sys_sigreturn", ENTRY_S},
{"sys_rt_sigreturn", ENTRY_S},
{"sys_sigsuspend", ENTRY_S},
{"sys_rt_sigsuspend", ENTRY_S},
{"ret_from_smpfork", ENTRY_S},
{"_stext", HEAD_S},
{"__start", HEAD_S},
{"__smp_callin", HEAD_S},
{"cserve_ena", HEAD_S},
{"cserve_dis", HEAD_S},
{"halt", HEAD_S},
{"start_kernel", MAIN_C},
{"smp_callin", SMP_C},
{NULL, NULL} /* list must be NULL-terminated */
};
static void
alpha_dump_line_number(char *name, ulong callpc)
{
char buf[BUFSIZE], *p;
int retries;
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;
}
}
}
/*
* Look for the frame size storage at the beginning of a function.
* If it's not obvious, try gdb.
*
* For future reference, here's where the numbers come from:
*
* 0xfffffc00003217e8 <schedule+8>: subq sp,0x50,sp
* fffffc00003217e8: 43ca153e
* 010000 11110 01010000 1 0101001 11110
*
* 0xfffffc0000321668 <schedule_timeout+8>: subq sp,0x60,sp
* fffffc0000321668: 43cc153e
* 010000 11110 01100000 1 0101001 11110
*
* 0xfffffc000035d028 <do_select+8>: subq sp,0x70,sp
* fffffc000035d028: 43ce153e
* 010000 11110 01110000 1 0101001 11110
*
* 0100 0011 110x xxxx xxx1 0101 0011 1110
* 1111 1111 111x xxxx xxx1 1111 1111 1111
* 0000 0000 0001 1111 1110 0000 0000 0000
* f f e 0 1 f f f instruction mask
* 0 0 1 f e 0 0 0 offset
*
* stq ra,0(sp)
* fffffc000035d034: b75e0000
*/
static void
alpha_frame_offset(struct gnu_request *req, ulong alt_pc)
{
uint *ip, ival;
ulong value;
req->value = value = 0;
if (alt_pc && !is_kernel_text(alt_pc))
error(FATAL,
"trying to get frame offset of non-text address: %lx\n",
alt_pc);
else if (!alt_pc && !is_kernel_text(req->pc))
error(FATAL,
"trying to get frame offset of non-text address: %lx\n",
req->pc);
ip = alt_pc ? (int *)closest_symbol_value(alt_pc) :
(int *)closest_symbol_value(req->pc);
if (!ip)
goto use_gdb;
ival = 0;
/*
* Don't go any farther than "stq ra,0(sp)" (0xb75e0000)
*/
while (ival != 0xb75e0000) {
readmem((ulong)ip, KVADDR, &ival, sizeof(uint),
"text value", FAULT_ON_ERROR);
if ((ival & 0xffe01fff) == 0x43c0153e) {
value = (ival & 0x1fe000) >> 13;
break;
}
ip++;
}
if (value) {
req->value = value;
return;
}
use_gdb:
#ifndef GDB_5_3
{
static int gdb_frame_offset_warnings = 10;
if (gdb_frame_offset_warnings-- > 0)
error(WARNING,
"GNU_ALPHA_FRAME_OFFSET functionality not ported to gdb\n");
}
#endif
req->command = GNU_ALPHA_FRAME_OFFSET;
if (alt_pc) {
ulong pc_save;
pc_save = req->pc;
req->pc = alt_pc;
gdb_interface(req);
req->pc = pc_save;
} else
gdb_interface(req);
}
/*
* Look for key routines that either mean the trace has ended or has
* bumped into an exception frame.
*/
int
alpha_trace_status(struct gnu_request *req, struct bt_info *bt)
{
ulong value;
char *func;
ulong frame;
req->addr = 0;
func = req->name;
frame = req->sp;
if (STREQ(func, "start_kernel") ||
STREQ(func, "smp_callin") ||
STREQ(func, "kernel_thread") ||
STREQ(func, "__kernel_thread"))
return ALPHA_END_OF_TRACE;
if (STREQ(func, "ret_from_smp_fork") ||
STREQ(func, "ret_from_smpfork"))
return ALPHA_RET_FROM_SMP_FORK;
if (STREQ(func, "entSys"))
return ALPHA_SYSCALL_FRAME;
if (STREQ(func, "entMM")) {
req->sp += 56; /* see entMM in entry.S */
return ALPHA_MM_FAULT;
}
if (STREQ(func, "do_entInt"))
return ALPHA_EXCEPTION_FRAME;
if (STREQ(func, "do_entArith"))
return ALPHA_EXCEPTION_FRAME;
if (STREQ(func, "do_entIF"))
return ALPHA_EXCEPTION_FRAME;
if (STREQ(func, "do_entDbg"))
return ALPHA_EXCEPTION_FRAME;
if (STREQ(func, "handle_bottom_half"))
return ALPHA_EXCEPTION_FRAME;
if (STREQ(func, "handle_softirq"))
return ALPHA_EXCEPTION_FRAME;
if (STREQ(func, "reschedule"))
return ALPHA_RESCHEDULE;
if (STREQ(func, "ret_from_reschedule"))
return ALPHA_RESCHEDULE;
if (STREQ(func, "signal_return"))
return ALPHA_SIGNAL_RETURN;
if (STREQ(func, "strace"))
return ALPHA_STRACE;
if (STREQ(func, "__down_failed") ||
STREQ(func, "__down_failed_interruptible")) {
readmem(req->sp + 144, KVADDR, &req->pc, sizeof(ulong),
"__down_failed r26", FAULT_ON_ERROR);
req->sp += 160;
return ALPHA_DOWN_FAILED;
}
value = GET_STACK_ULONG(frame);
if (STREQ(closest_symbol(value), "do_entInt") ||
STREQ(closest_symbol(value), "do_entArith") ||
STREQ(closest_symbol(value), "do_entIF") ||
STREQ(closest_symbol(value), "do_entDbg")) {
req->addr = value;
req->frame = 0;
while (INSTACK(frame, bt)) {
frame += sizeof(ulong);
value = GET_STACK_ULONG(frame);
if (STREQ(closest_symbol(value), "ret_from_sys_call")) {
alpha_frame_offset(req, req->addr);
/* req->frame = frame + req->value; XXX */
break;
}
}
return ALPHA_INTERRUPT_PENDING;
}
return ALPHA_CONTINUE_TRACE;
}
/*
* Redo the gdb pt_regs structure output.
*/
enum regnames { _r0_, _r1_, _r2_, _r3_, _r4_, _r5_, _r6_, _r7_, _r8_,
_r19_, _r20_, _r21_, _r22_, _r23_, _r24_, _r25_, _r26_,
_r27_, _r28_, _hae_, _trap_a0_, _trap_a1_, _trap_a2_,
_ps_, _pc_, _gp_, _r16_, _r17_, _r18_, NUMREGS};
struct alpha_eframe {
char regs[30][30];
ulong value[29];
};
static void
alpha_exception_frame(ulong addr,
ulong flags,
struct gnu_request *req,
struct bt_info *bt)
{
int i, j;
char buf[BUFSIZE];
ulong value;
physaddr_t paddr;
struct alpha_eframe eframe;
if (CRASHDEBUG(4))
fprintf(fp, "alpha_exception_frame: %lx\n", addr);
if (flags & BT_SPECULATE) {
req->pc = 0;
fprintf(fp, "ALPHA EXCEPTION FRAME\n");
return;
}
BZERO(&eframe, sizeof(struct alpha_eframe));
open_tmpfile();
dump_struct("pt_regs", addr, RADIX(16));
rewind(pc->tmpfile);
while (fgets(buf, BUFSIZE, pc->tmpfile)) {
strip_comma(clean_line(buf));
if (!strstr(buf, "0x"))
continue;
extract_hex(buf, &value, NULLCHAR, TRUE);
if (CRASHDEBUG(4))
fprintf(pc->saved_fp, "<%s> %lx\n", buf, value);
if (STRNEQ(buf, "r0 = ")) {
sprintf(eframe.regs[_r0_], " V0/R0: %016lx", value);
eframe.value[_r0_] = value;
}
if (STRNEQ(buf, "r1 = ")) {
sprintf(eframe.regs[_r1_], " T0/R1: %016lx", value);
eframe.value[_r1_] = value;
}
if (STRNEQ(buf, "r2 = ")) {
sprintf(eframe.regs[_r2_], " T1/R2: %016lx", value);
eframe.value[_r2_] = value;
}
if (STRNEQ(buf, "r3 = ")) {
sprintf(eframe.regs[_r3_], " T2/R3: %016lx", value);
eframe.value[_r3_] = value;
}
if (STRNEQ(buf, "r4 = ")) {
sprintf(eframe.regs[_r4_], " T3/R4: %016lx", value);
eframe.value[_r4_] = value;
}
if (STRNEQ(buf, "r5 = ")) {
sprintf(eframe.regs[_r5_], " T4/R5: %016lx", value);
eframe.value[_r5_] = value;
}
if (STRNEQ(buf, "r6 = ")) {
sprintf(eframe.regs[_r6_], " T5/R6: %016lx", value);
eframe.value[_r6_] = value;
}
if (STRNEQ(buf, "r7 = ")) {
sprintf(eframe.regs[_r7_], " T6/R7: %016lx", value);
eframe.value[_r7_] = value;
}
if (STRNEQ(buf, "r8 = ")) {
sprintf(eframe.regs[_r8_], " T7/R8: %016lx", value);
eframe.value[_r8_] = value;
}
if (STRNEQ(buf, "r19 = ")) {
sprintf(eframe.regs[_r19_], " A3/R19: %016lx", value);
eframe.value[_r19_] = value;
}
if (STRNEQ(buf, "r20 = ")) {
sprintf(eframe.regs[_r20_], " A4/R20: %016lx", value);
eframe.value[_r20_] = value;