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picodrive/platform/common/disarm.c

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/*
* Copyright (c) 2012 Wojtek Kaniewski <wojtekka@toxygen.net>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <stdio.h>
#include <string.h>
#define IMM_FORMAT "0x%x"
//#define IMM_FORMAT "%d"
#define ADDR_FORMAT "0x%x"
static inline unsigned int rol(unsigned int value, unsigned int shift)
{
shift &= 31;
return (value >> shift) | (value << (32 - shift));
}
static inline const char *condition(unsigned int insn)
{
const char *conditions[16] = { "eq", "ne", "cs", "cc", "mi", "pl", "vs", "vc", "hi", "ls", "ge", "lt", "gt", "le", "", "nv" };
return conditions[(insn >> 28) & 0x0f];
}
static inline const char *register_name(unsigned int reg)
{
const char *register_names[16] = { "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "sp", "lr", "pc" };
return register_names[reg & 0x0f];
}
static const char *register_list(unsigned int list, char *buf, size_t buf_len)
{
int i;
buf[0] = 0;
for (i = 0; i < 16; i++)
{
if ((list >> i) & 1)
{
snprintf(buf + strlen(buf), buf_len - strlen(buf), "%s%s", (buf[0] == 0) ? "" : ",", register_name(i));
}
}
return buf;
}
static const char *shift(unsigned int insn, char *buf, size_t buf_len)
{
unsigned int imm = (insn >> 7) & 0x1f;
const char *rn = register_name(insn >> 8);
unsigned int type = (insn >> 4) & 0x07;
switch (type)
{
case 0:
snprintf(buf, buf_len, (imm != 0) ? ",lsl #%d" : "", imm);
break;
case 1:
snprintf(buf, buf_len, ",lsl %s", rn);
break;
case 2:
snprintf(buf, buf_len, ",lsr #%d", imm ? imm : 32);
break;
case 3:
snprintf(buf, buf_len, ",lsr %s", rn);
break;
case 4:
snprintf(buf, buf_len, ",asr #%d", imm ? imm : 32);
break;
case 5:
snprintf(buf, buf_len, ",asr %s", rn);
break;
case 6:
snprintf(buf, buf_len, (imm != 0) ? ",ror #%d" : ",rrx", imm);
break;
case 7:
snprintf(buf, buf_len, ",ror %s", rn);
break;
}
return buf;
}
static const char *immediate(unsigned int imm, int negative, int show_if_zero, char *buf, size_t buf_len)
{
if (imm || show_if_zero)
{
snprintf(buf, buf_len, ",#%s" IMM_FORMAT, (negative) ? "-" : "", imm);
return buf;
}
return "";
}
static int data_processing(unsigned int pc, unsigned int insn, char *buf, size_t buf_len)
{
unsigned int oper = (insn >> 21) & 15;
const char *names[16] = { "and", "eor", "sub", "rsb", "add", "adc", "sbc", "rsc", "tst", "teq", "cmp", "cmn", "orr", "mov", "bic", "mvn" };
const char *name;
const char *s;
unsigned int rd;
unsigned int rn;
int is_move = ((oper == 13) || (oper == 15));
int is_test = ((oper >= 8) && (oper <= 11));
char tmp_buf[64];
name = names[oper];
s = ((insn >> 20) & 1) ? "s" : "";
rn = (insn >> 16) & 15;
rd = (insn >> 12) & 15;
/* mov r0,r0,r0 is a nop */
if (insn == 0xe1a00000)
{
snprintf(buf, buf_len, "nop");
return 1;
}
/* mrs */
if ((insn & 0x0fbf0fff) == 0x010f0000)
{
const char *psr = ((insn >> 22) & 1) ? "spsr" : "cpsr";
const char *rd = register_name(insn >> 12);
snprintf(buf, buf_len, "mrs%s %s,%s", condition(insn), rd, psr);
return 1;
}
/* msr flag only*/
if ((insn & 0x0db0f000) == 0x0120f000)
{
const char *psr = ((insn >> 22) & 1) ? "spsr" : "cpsr";
const char *suffix;
switch ((insn >> 16) & 15)
{
case 9:
suffix = "";
break;
case 8:
suffix = "_f";
break;
case 1:
suffix = "_c";
break;
default:
return 0;
}
if ((insn >> 25) & 1)
{
unsigned int imm = rol(insn & 0x000000ff, ((insn >> 8) & 15) * 2);
snprintf(buf, buf_len, "msr%s %s%s,#" IMM_FORMAT, condition(insn), psr, suffix, imm);
}
else
{
const char *rm = register_name(insn >> 0);
if (((insn >> 4) & 255) != 0)
{
return 0;
}
snprintf(buf, buf_len, "msr%s %s%s,%s", condition(insn), psr, suffix, rm);
}
return 1;
}
if (((insn >> 25) & 1) == 0)
{
unsigned int rm;
rm = (insn & 15);
if (is_move)
{
snprintf(buf, buf_len, "%s%s%s %s,%s%s", name, condition(insn), s, register_name(rd), register_name(rm), shift(insn, tmp_buf, sizeof(tmp_buf)));
}
else if (is_test)
{
snprintf(buf, buf_len, "%s%s %s,%s%s", name, condition(insn), register_name(rn), register_name(rm), shift(insn, tmp_buf, sizeof(tmp_buf)));
}
else
{
snprintf(buf, buf_len, "%s%s%s %s,%s,%s%s", name, condition(insn), s, register_name(rd), register_name(rn), register_name(rm), shift(insn, tmp_buf, sizeof(tmp_buf)));
}
}
else if ((insn & 0x0fb00000) == 0x03000000)
{
unsigned int imm;
char *half = (insn & 0x00400000) ? "t" : "w";
imm = (insn & 0x00000fff) | ((insn & 0x000f0000) >> 4);
snprintf(buf, buf_len, "mov%s%s %s%s", half, condition(insn), register_name(rd), immediate(imm, 0, 1, tmp_buf, sizeof(tmp_buf)));
}
else
{
unsigned int imm;
imm = rol(insn & 0x000000ff, ((insn >> 8) & 15) * 2);
if (is_move)
{
snprintf(buf, buf_len, "%s%s%s %s%s", name, condition(insn), s, register_name(rd), immediate(imm, 0, 1, tmp_buf, sizeof(tmp_buf)));
}
else if (is_test)
{
snprintf(buf, buf_len, "%s%s %s%s", name, condition(insn), register_name(rn), immediate(imm, 0, 1, tmp_buf, sizeof(tmp_buf)));
}
else
{
snprintf(buf, buf_len, "%s%s%s %s,%s%s", name, condition(insn), s, register_name(rd), register_name(rn), immediate(imm, 0, 1, tmp_buf, sizeof(tmp_buf)));
}
}
return 1;
}
static int branch(unsigned int pc, unsigned int insn, char *buf, size_t buf_len)
{
const char *link = ((insn >> 24) & 1) ? "l" : "";
unsigned int address;
unsigned int offset;
offset = insn & 0x00ffffff;
if ((offset & 0x00800000) != 0)
{
offset |= 0xff000000;
}
address = pc + 8 + (offset << 2);
snprintf(buf, buf_len, "b%s%s " ADDR_FORMAT, link, condition(insn), address);
return 1;
}
static int multiply(unsigned int pc, unsigned int insn, char *buf, size_t buf_len)
{
const char *rd = register_name(insn >> 16);
const char *rn = register_name(insn >> 12);
const char *rs = register_name(insn >> 8);
const char *rm = register_name(insn >> 0);
const char *s = ((insn >> 20) & 1) ? "s" : "";
int mla = (insn >> 21) & 1;
snprintf(buf, buf_len, (mla) ? "mla%s%s %s,%s,%s,%s" : "mul%s%s %s,%s,%s", condition(insn), s, rd, rm, rs, rn);
return 1;
}
static int multiply_long(unsigned int pc, unsigned int insn, char *buf, size_t buf_len)
{
const char *rh = register_name(insn >> 16);
const char *rl = register_name(insn >> 12);
const char *rs = register_name(insn >> 8);
const char *rm = register_name(insn >> 0);
const char *u = ((insn >> 22) & 1) ? "s" : "u";
const char *s = ((insn >> 20) & 1) ? "s" : "";
const char *name = ((insn >> 21) & 1) ? "mlal" : "mull";
snprintf(buf, buf_len, "%s%s%s%s %s,%s,%s,%s", u, name, condition(insn), s, rl, rh, rm, rs);
return 1;
}
static int single_data_swap(unsigned int pc, unsigned int insn, char *buf, size_t buf_len)
{
const char *rn = register_name(insn >> 16);
const char *rd = register_name(insn >> 12);
const char *rm = register_name(insn >> 0);
const char *b = ((insn >> 22) & 1) ? "b" : "";
snprintf(buf, buf_len, "swp%s%s %s,%s,[%s]", condition(insn), b, rd, rm, rn);
return 1;
}
static int branch_and_exchange(unsigned int pc, unsigned int insn, char *buf, size_t buf_len)
{
const char *rn = register_name(insn >> 0);
const char *l = ((insn >> 5) & 1) ? "l" : "";
snprintf(buf, buf_len, "b%sx%s %s", l, condition(insn), rn);
return 1;
}
static int halfword_data_transfer(unsigned int pc, unsigned int insn, char *buf, size_t buf_len)
{
const char *rn = register_name(insn >> 16);
const char *rd = register_name(insn >> 12);
const char *name = ((insn >> 20) & 1) ? "ldr" : "str";
const char *w = ((insn >> 21) & 1) ? "!" : "";
int sign = (insn >> 23) & 1;
int pre = (insn >> 24) & 1;
const char *suffix = "";
char tmp_buf[64];
switch ((insn >> 5) & 3)
{
case 0:
name = "swp";
break;
case 1:
suffix = "h";
break;
case 2:
suffix = "sb";
break;
case 3:
suffix = "sh";
break;
}
if ((insn >> 22) & 1)
{
unsigned int imm = ((insn >> 4) & 0xf0) | (insn & 0x0f);
snprintf(buf, buf_len, (pre) ? "%s%s%s %s,[%s%s]%s" : "%s%s%s %s,[%s],%s%s", name, condition(insn), suffix, rd, rn, immediate(imm, !sign, 0, tmp_buf, sizeof(tmp_buf)), w);
}
else
{
const char *rm = register_name(insn >> 0);
snprintf(buf, buf_len, (pre) ? "%s%s%s %s,[%s,%s%s]%s" : "%s%s%s %s,[%s],%s%s%s", name, condition(insn), suffix, rd, rn, sign ? "" : "-", rm, w);
}
return 1;
}
static int single_data_transfer(unsigned int pc, unsigned int insn, char *buf, size_t buf_len)
{
const char *rn = register_name(insn >> 16);
const char *rd = register_name(insn >> 12);
const char *name = ((insn >> 20) & 1) ? "ldr" : "str";
const char *w = ((insn >> 21) & 1) ? "!" : "";
const char *b = ((insn >> 22) & 1) ? "b" : "";
int sign = (insn >> 23) & 1;
int pre = (insn >> 24) & 1;
char tmp_buf[64];
if ((insn >> 25) & 1)
{
const char *rm = register_name(insn >> 0);
snprintf(buf, buf_len, (pre) ? "%s%s%s %s,[%s,%s%s%s]%s" : "%s%s%s %s,[%s],%s%s%s%s", name, condition(insn), b, rd, rn, sign ? "" : "-", rm, shift(insn, tmp_buf, sizeof(tmp_buf)), w);
}
else
{
unsigned int imm = insn & 0x00000fff;
snprintf(buf, buf_len, (pre) ? "%s%s%s %s,[%s%s]%s" : "%s%s%s %s,[%s]%s%s", name, condition(insn), b, rd, rn, immediate(imm, !sign, 0, tmp_buf, sizeof(tmp_buf)), w);
}
return 1;
}
static int block_data_transfer(unsigned int pc, unsigned int insn, char *buf, size_t buf_len)
{
const char *s = ((insn >> 22) & 1) ? "^" : "";
const char *w = ((insn >> 21) & 1) ? "!" : "";
int load = (insn >> 20) & 1;
const char *name = (load) ? "ldm" : "stm";
const char *ldm_stubs[4] = { "fa", "fd", "ea", "ed" };
const char *stm_stubs[4] = { "ed", "ea", "fd", "fa" };
int stub_idx = (insn >> 23) & 3;
const char *stub = (load) ? ldm_stubs[stub_idx] : stm_stubs[stub_idx];
char tmp_buf[64];
snprintf(buf, buf_len, "%s%s%s %s%s, {%s}%s", name, condition(insn), stub, register_name(insn >> 16), w, register_list(insn & 0xffff, tmp_buf, sizeof(tmp_buf)), s);
return 1;
}
static int coprocessor_data_transfer(unsigned int pc, unsigned int insn, char *buf, size_t buf_len)
{
const char *name = ((insn >> 20) & 1) ? "ldc" : "stc";
const char *rn = register_name(insn >> 16);
int sign = (insn >> 23) & 1;
const char *l = ((insn >> 22) & 1) ? "l" : "";
const char *w = ((insn >> 21) & 1) ? "!" : "";
int pre = (insn >> 24) & 1;
unsigned int cp = (insn >> 8) & 15;
unsigned int cd = (insn >> 12) & 15;
unsigned int imm = (insn >> 0) & 255;
char tmp_buf[64];
snprintf(buf, buf_len, (pre) ? "%s%s%s p%d,cr%d,[%s%s]%s" : "%s%s%s p%d,cr%d,[%s]%s%s", name, condition(insn), l, cp, cd, rn, immediate(imm, !sign, 0, tmp_buf, sizeof(tmp_buf)), w);
return 1;
}
static int coprocessor_data_operation(unsigned int pc, unsigned int insn, char *buf, size_t buf_len)
{
snprintf(buf, buf_len, "cdp%s p%d,%d,cr%d,cr%d,cr%d,{%d}", condition(insn), (insn >> 8) & 15, (insn >> 20) & 15, (insn >> 12) & 15, (insn >> 16) & 15, (insn >> 0) & 15, (insn >> 5) & 7);
return 1;
}
static int coprocessor_register_transfer(unsigned int pc, unsigned int insn, char *buf, size_t buf_len)
{
const char *name = ((insn >> 20) & 1) ? "mrc" : "mcr";
unsigned int cn = (insn >> 16) & 15;
const char *rd = register_name(insn >> 12);
unsigned int expr1 = (insn >> 21) & 7;
unsigned int expr2 = (insn >> 5) & 7;
unsigned int cp = (insn >> 8) & 15;
unsigned int cm = (insn >> 0) & 15;
snprintf(buf, buf_len, "%s%s p%d,%d,%s,cr%d,cr%d,{%d}", name, condition(insn), cp, expr1, rd, cn, cm, expr2);
return 1;
}
static int software_interrupt(unsigned int pc, unsigned int insn, char *buf, size_t buf_len)
{
snprintf(buf, buf_len, "swi%s %u", condition(insn), insn & 0x00ffffff);
return 1;
}
int disarm(uintptr_t pc, uint32_t insn, char *buf, size_t buf_len, unsigned long *addr)
{
*addr = 0;
if ((insn & 0x0fffffd0) == 0x012fff10)
return branch_and_exchange(pc, insn, buf, buf_len);
if ((insn & 0x0fb00ff0) == 0x01000090)
return single_data_swap(pc, insn, buf, buf_len);
if ((insn & 0x0fc000f0) == 0x00000090)
return multiply(pc, insn, buf, buf_len);
if ((insn & 0x0f8000f0) == 0x00800090)
return multiply_long(pc, insn, buf, buf_len);
if ((insn & 0x0f000010) == 0x0e000000)
return coprocessor_data_operation(pc, insn, buf, buf_len);
if ((insn & 0x0f000010) == 0x0e000010)
return coprocessor_register_transfer(pc, insn, buf, buf_len);
if ((insn & 0x0f000000) == 0x0f000000)
return software_interrupt(pc, insn, buf, buf_len);
if ((insn & 0x0e000090) == 0x00000090)
return halfword_data_transfer(pc, insn, buf, buf_len);
if ((insn & 0x0e000000) == 0x08000000)
return block_data_transfer(pc, insn, buf, buf_len);
if ((insn & 0x0e000000) == 0x0a000000) {
*addr = (unsigned long)pc+8 + ((unsigned long)(insn << 8) >> 6);
return branch(pc, insn, buf, buf_len);
}
if ((insn & 0x0e000000) == 0x0c000000)
return coprocessor_data_transfer(pc, insn, buf, buf_len);
if ((insn & 0x0c000000) == 0x00000000)
return data_processing(pc, insn, buf, buf_len);
if ((insn & 0x0c000000) == 0x04000000)
return single_data_transfer(pc, insn, buf, buf_len);
return 0;
}
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