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#include <string.h>
#include "armdis.h"
#include "snprintf.h"
#include "dis-asm.h"
class ArmDisassembler::BFDInterface
{
disassemble_info di;
char *pos;
char buf[4];
ArmDisInsn *insn;
static int read_mem(bfd_vma, bfd_byte *myaddr, unsigned int length,
disassemble_info *info)
{
BFDInterface *thiz = static_cast<BFDInterface *>(info->application_data);
memcpy(myaddr, thiz->buf, length);
return 0;
}
static void mem_err(int, bfd_vma, disassemble_info *)
{}
static void paf(bfd_vma addr, disassemble_info *info)
{
BFDInterface *thiz = static_cast<BFDInterface *>(info->application_data);
thiz->insn->offset = addr;
bfdif_printf(info->stream, "@");
}
static int bfdif_printf(void *s, const char *fmt, ...)
{
BFDInterface *thiz = static_cast<BFDInterface *>(s);
va_list ap;
unsigned siz = sizeof(thiz->insn->opstr) - (thiz->pos - thiz->insn->opstr);
va_start(ap, fmt);
int n = ht_vsnprintf(thiz->pos, siz, fmt, ap);
thiz->pos += n;
va_end(ap);
return n;
}
public:
BFDInterface()
{
memset(&di, 0, sizeof(di));
di.fprintf_func = bfdif_printf;
di.stream = this;
di.endian = BFD_ENDIAN_LITTLE;
di.read_memory_func = read_mem;
di.print_address_func = paf;
di.application_data = this;
}
void Decode(byte *code, int maxlen, unsigned addr, ArmDisInsn *insn_)
{
memset(buf, 0, sizeof(buf));
memcpy(buf, code, maxlen > 4 ? 4 : maxlen);
insn = insn_;
pos = insn->opstr;
insn->offset = ~0U;
// little endian specific
insn->iscond = (unsigned) buf[3] < 0xe0;
print_insn_little_arm(addr, &di);
// FILE *f=fopen("/tmp/htlog","a");fprintf(f,"%s\n",insn->opstr);fclose(f);
}
};
ArmDisassembler::ArmDisassembler()
{
bfdif = new BFDInterface;
}
void ArmDisassembler::load(ObjectStream &f)
{
bfdif = new BFDInterface;
Disassembler::load(f);
}
dis_insn *ArmDisassembler::duplicateInsn(dis_insn *disasm_insn)
{
ArmDisInsn *insn = (ArmDisInsn *) malloc(sizeof(ArmDisInsn));
*insn = *(ArmDisInsn *)disasm_insn;
return insn;
}
void ArmDisassembler::getOpcodeMetrics(int &min_length, int &max_length, int &min_look_ahead, int &avg_look_ahead, int &addr_align)
{
min_length = 4;
max_length = 4;
min_look_ahead = 4;
avg_look_ahead = 4;
addr_align = 4;
}
byte ArmDisassembler::getSize(dis_insn *disasm_insn)
{
return 4;//((ArmDisInsn*)disasm_insn)->size;
}
const char *ArmDisassembler::getName()
{
return "Arm/Disassembler";
}
ObjectID ArmDisassembler::getObjectID() const
{
return ATOM_DISASM_ARM;
}
bool ArmDisassembler::validInsn(dis_insn *disasm_insn)
{
return true;
ArmDisInsn *adi = static_cast<ArmDisInsn *>(disasm_insn);
return memcmp(adi->opstr, "undefined", 9) != 0;
}
dis_insn *ArmDisassembler::decode(byte *code, int maxlen, CPU_ADDR addr)
{
bfdif->Decode(code, maxlen, addr.addr32.offset, &insn);
#if 0
char *pc;
if (insn.offset == ~0u && (pc = strstr(insn.opstr, ", pc, #")) != 0)
insn.offset = atol(pc + 7);
#endif
return &insn;
}
const char *ArmDisassembler::strf(dis_insn *disasm_insn, int style, const char *)
{
ArmDisInsn *adi = static_cast<ArmDisInsn *>(disasm_insn);
if (style & DIS_STYLE_HIGHLIGHT) enable_highlighting();
//const char *cs_default = get_cs(e_cs_default);
const char *cs_number = get_cs(e_cs_number);
//const char *cs_symbol = get_cs(e_cs_symbol);
static char buf[512];
char *out = buf;
const char *in = adi->opstr;
while (in[0] && in[0] != '\t') *out++ = *in++;
if (!in[0]) goto strfend;
in++; // skip tab
while (out < buf + 12) *out++ = ' ';
while (*in && *in != ';') {
if (*in != '@') {
*out++ = *in++;
} else {
in++;
CPU_ADDR caddr;
caddr.addr32.offset = adi->offset;
int slen;
char *s = (addr_sym_func) ? addr_sym_func(caddr, &slen, addr_sym_func_context) : 0;
if (s) {
if (out + slen > buf + sizeof(buf) - 1)
slen = buf + sizeof(buf) - 1 - out;
memcpy(out, s, slen);
out[slen] = 0;
out += slen;
} else {
out += sprintf(out, "%s0x%x", cs_number, adi->offset);
}
}
}
if (*in == ';' && out[-1] == '\t') out--;
{
char *p = strstr(buf, "[pc, #");
if (p && adi->offset != ~0u) {
CPU_ADDR caddr;
caddr.addr32.offset = adi->offset;
int slen;
char *s = (addr_sym_func) ? addr_sym_func(caddr, &slen, addr_sym_func_context) : 0;
if (s) {
if (out + slen > buf + sizeof(buf) - 1)
slen = buf + sizeof(buf) - 1 - out;
memcpy(out = p, s, slen);
out += slen;
}
}
}
strfend:
*out = 0;
disable_highlighting();
return buf;
}
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