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/*
* ppc.c
*
* 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.
*/
#include <stdarg.h>
#include <string.h>
#include <dis-asm.h>
#include "kdumpid.h"
#define MAX_INSN_LEN 100
struct disas_state {
unsigned long flags;
};
#define SRR0_SET 1
#define SRR1_SET 2
struct disas_priv {
char *iptr;
struct disas_state state;
char insn[MAX_INSN_LEN];
};
static const char sep[] = ", \t\r\n";
#define wsep (sep+1)
static disassembler_ftype print_insn;
static void
append_insn(void *data, const char *fmt, va_list va)
{
struct disas_priv *priv = data;
size_t remain;
int len;
remain = priv->insn + sizeof(priv->insn) - priv->iptr;
len = vsnprintf(priv->iptr, remain, fmt, va);
if (len > 0)
priv->iptr += len;
}
static int
disas_fn(void *data, const char *fmt, ...)
{
va_list va;
va_start(va, fmt);
append_insn(data, fmt, va);
va_end(va);
return 0;
}
#ifdef DIS_ASM_STYLED_PRINTF
static int
disas_styled_fn(void *data, enum disassembler_style style,
const char *fmt, ...)
{
va_list va;
va_start(va, fmt);
append_insn(data, fmt, va);
va_end(va);
return 0;
}
#endif /* DIS_ASM_STYLED_PRINTF */
static void error_func(int status, bfd_vma memaddr,
struct disassemble_info *dinfo)
{
/* intentionally empty */
}
static int
disas_at(struct dump_desc *dd, struct disassemble_info *info, unsigned pc)
{
struct disas_priv *priv = info->stream;
char *toksave;
char *insn;
int count;
do {
priv->iptr = priv->insn;
count = print_insn(info->buffer_vma + pc, info);
if (count < 0)
break;
pc += count;
insn = strtok_r(priv->insn, wsep, &toksave);
/* for historical reasons, ppc starts with 3 NOPs */
if (pc <= 3 * 4 && strcmp(insn, "nop"))
break;
/* MMU is switched on with an rfi */
if (priv->state.flags & SRR0_SET &&
priv->state.flags & SRR1_SET &&
!strcmp(insn, "rfi"))
return 1;
if (!strcmp(insn, "mtsrr0"))
priv->state.flags |= SRR0_SET;
if (!strcmp(insn, "mtsrr1"))
priv->state.flags |= SRR1_SET;
/* invalid instruction? */
if (!strcmp(insn, ".long"))
break;
} while (count > 0);
return 0;
}
int
looks_like_kcode_ppc(struct dump_desc *dd, uint64_t addr)
{
struct disassemble_info info;
struct disas_priv priv;
/* check ppc startup code */
if (read_page(dd, addr / dd->page_size))
return -1;
memset(&priv, 0, sizeof priv);
#ifdef DIS_ASM_STYLED_PRINTF
init_disassemble_info(&info, &priv, disas_fn, disas_styled_fn);
#else
init_disassemble_info(&info, &priv, disas_fn);
#endif
info.memory_error_func = error_func;
info.buffer = dd->page;
info.buffer_vma = addr;
info.buffer_length = dd->page_size;
info.arch = bfd_arch_powerpc;
info.mach = bfd_mach_ppc;
disassemble_init_for_target(&info);
print_insn = disassembler(bfd_arch_powerpc,
dd->endian != KDUMP_LITTLE_ENDIAN,
bfd_mach_ppc, NULL);
if (!print_insn)
return 0;
return disas_at(dd, &info, 0);
}
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