/*
* Copyright (c) 2004 Marcel Moolenaar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#ifndef CROSS_DEBUGGER
#include <machine/pcb.h>
#include <machine/frame.h>
#include <machine/armreg.h>
#endif
#include <err.h>
#include <kvm.h>
#include <string.h>
#include <defs.h>
#include <target.h>
#include <gdbthread.h>
#include <inferior.h>
#include <regcache.h>
#include <frame-unwind.h>
#include <arm-tdep.h>
#include "kgdb.h"
CORE_ADDR
kgdb_trgt_core_pcb(u_int cpuid)
{
#ifndef CROSS_DEBUGGER
return (kgdb_trgt_stop_pcb(cpuid, sizeof(struct pcb)));
#else
return -1;
#endif
}
void
kgdb_trgt_fetch_registers(int regno __unused)
{
#ifndef CROSS_DEBUGGER
struct kthr *kt;
struct pcb pcb;
int i;
kt = kgdb_thr_lookup_tid(ptid_get_pid(inferior_ptid));
if (kt == NULL)
return;
if (kvm_read(kvm, kt->pcb, &pcb, sizeof(pcb)) != sizeof(pcb)) {
warnx("kvm_read: %s", kvm_geterr(kvm));
memset(&pcb, 0, sizeof(pcb));
}
for (i = ARM_A1_REGNUM + 4; i <= ARM_SP_REGNUM; i++) {
supply_register(i, (char *)&pcb.pcb_regs.sf_r4 +
(i - (ARM_A1_REGNUM + 4 )) * 4);
}
supply_register(ARM_PC_REGNUM, (char *)&pcb.pcb_regs.sf_pc);
supply_register(ARM_LR_REGNUM, (char *)&pcb.pcb_regs.sf_lr);
#endif
}
void
kgdb_trgt_store_registers(int regno __unused)
{
fprintf_unfiltered(gdb_stderr, "XXX: %s\n", __func__);
}
void
kgdb_trgt_new_objfile(struct objfile *objfile)
{
}
#ifndef CROSS_DEBUGGER
struct kgdb_frame_cache {
CORE_ADDR fp;
CORE_ADDR sp;
CORE_ADDR pc;
};
static int kgdb_trgt_frame_offset[26] = {
offsetof(struct trapframe, tf_r0),
offsetof(struct trapframe, tf_r1),
offsetof(struct trapframe, tf_r2),
offsetof(struct trapframe, tf_r3),
offsetof(struct trapframe, tf_r4),
offsetof(struct trapframe, tf_r5),
offsetof(struct trapframe, tf_r6),
offsetof(struct trapframe, tf_r7),
offsetof(struct trapframe, tf_r8),
offsetof(struct trapframe, tf_r9),
offsetof(struct trapframe, tf_r10),
offsetof(struct trapframe, tf_r11),
offsetof(struct trapframe, tf_r12),
offsetof(struct trapframe, tf_svc_sp),
offsetof(struct trapframe, tf_svc_lr),
offsetof(struct trapframe, tf_pc),
-1, -1, -1, -1, -1, -1, -1, -1, -1,
offsetof(struct trapframe, tf_spsr)
};
static struct kgdb_frame_cache *
kgdb_trgt_frame_cache(struct frame_info *next_frame, void **this_cache)
{
char buf[MAX_REGISTER_SIZE];
struct kgdb_frame_cache *cache;
cache = *this_cache;
if (cache == NULL) {
cache = FRAME_OBSTACK_ZALLOC(struct kgdb_frame_cache);
*this_cache = cache;
frame_unwind_register(next_frame, ARM_SP_REGNUM, buf);
cache->sp = extract_unsigned_integer(buf,
register_size(current_gdbarch, ARM_SP_REGNUM));
frame_unwind_register(next_frame, ARM_FP_REGNUM, buf);
cache->fp = extract_unsigned_integer(buf,
register_size(current_gdbarch, ARM_FP_REGNUM));
cache->pc = frame_func_unwind(next_frame);
}
return (cache);
}
static int is_undef;
static void
kgdb_trgt_trapframe_this_id(struct frame_info *next_frame, void **this_cache,
struct frame_id *this_id)
{
struct kgdb_frame_cache *cache;
cache = kgdb_trgt_frame_cache(next_frame, this_cache);
*this_id = frame_id_build(cache->sp, cache->pc);
}
static void
kgdb_trgt_trapframe_prev_register(struct frame_info *next_frame,
void **this_cache, int regnum, int *optimizedp, enum lval_type *lvalp,
CORE_ADDR *addrp, int *realnump, void *valuep)
{
char dummy_valuep[MAX_REGISTER_SIZE];
struct kgdb_frame_cache *cache;
int ofs, regsz;
CORE_ADDR sp;
regsz = register_size(current_gdbarch, regnum);
if (valuep == NULL)
valuep = dummy_valuep;
memset(valuep, 0, regsz);
*optimizedp = 0;
*addrp = 0;
*lvalp = not_lval;
*realnump = -1;
ofs = (regnum >= 0 && regnum <= ARM_PS_REGNUM)
? kgdb_trgt_frame_offset[regnum] : -1;
if (ofs == -1)
return;
cache = kgdb_trgt_frame_cache(next_frame, this_cache);
sp = cache->sp;
ofs = kgdb_trgt_frame_offset[regnum];
*addrp = sp + ofs;
*lvalp = lval_memory;
target_read_memory(*addrp, valuep, regsz);
}
static const struct frame_unwind kgdb_trgt_trapframe_unwind = {
UNKNOWN_FRAME,
&kgdb_trgt_trapframe_this_id,
&kgdb_trgt_trapframe_prev_register
};
#endif
const struct frame_unwind *
kgdb_trgt_trapframe_sniffer(struct frame_info *next_frame)
{
#ifndef CROSS_DEBUGGER
char *pname;
CORE_ADDR pc;
pc = frame_pc_unwind(next_frame);
pname = NULL;
find_pc_partial_function(pc, &pname, NULL, NULL);
if (pname == NULL) {
is_undef = 0;
return (NULL);
}
if (!strcmp(pname, "undefinedinstruction"))
is_undef = 1;
if (strcmp(pname, "Laddress_exception_entry") == 0 ||
strcmp(pname, "undefined_entry") == 0 ||
strcmp(pname, "exception_exit") == 0 ||
strcmp(pname, "Laddress_exception_msg") == 0 ||
strcmp(pname, "irq_entry") == 0)
return (&kgdb_trgt_trapframe_unwind);
if (!strcmp(pname, "undefinedinstruction"))
is_undef = 1;
else
is_undef = 0;
#endif
return (NULL);
}
/*
* This function ensures, that the PC is inside the
* function section which is understood by GDB.
*
* Return 0 when fixup is necessary, -1 otherwise.
*/
int
kgdb_trgt_pc_fixup(CORE_ADDR *pc)
{
#ifndef CROSS_DEBUGGER
struct minimal_symbol *msymbol;
int valpc;
/*
* exception_exit and swi_exit are special. These functions
* are artificially injected into the stack to be executed
* as the last entry in calling chain when all functions exit.
* Treat them differently.
*/
msymbol = lookup_minimal_symbol_by_pc(*pc);
if (msymbol != NULL) {
if (strcmp(DEPRECATED_SYMBOL_NAME(msymbol), "exception_exit") == 0)
return (0);
if (strcmp(DEPRECATED_SYMBOL_NAME(msymbol), "swi_exit") == 0)
return (0);
}
/*
* kdb_enter contains an invalid instruction which is supposed
* to generate a trap. BFD does not understand it and treats
* this part of function as a separate function. Move PC
* two instruction earlier to be inside kdb_enter section.
*/
target_read_memory(*pc - 4, (char*)&valpc, 4);
if (valpc == 0xe7ffffff) {
*pc = *pc - 8;
return (0);
}
/*
* When the panic/vpanic is the last (noreturn) function,
* the bottom of the calling function looks as below.
* mov lr, pc
* b panic
* Normally, GDB is not able to detect function boundaries,
* so move the PC two instruction earlier where it can deal
* with it.
* Match this pair of instructions: mov lr, pc followed with
* non-linked branch.
*/
if ((valpc & 0xff000000) == 0xea000000) {
target_read_memory(*pc - 8, (char*)&valpc, 4);
if (valpc == 0xe1a0e00f) {
*pc -= 8;
return (0);
}
}
#endif
return (-1);
}