Commit my checkpoint of db_disasm.c that I hacked to understand some amd64
instructions as it was when I dropped it back in May 31, 2003. I'm committing this as an intermediate stage because back then I thought I understood what I was doing with this file.
This commit is contained in:
Peter Wemm
parent
a2920586a8
commit
dc37635d6a
@ -49,6 +49,15 @@ __FBSDID("$FreeBSD$");
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#define SDEP 7
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#define NONE 8
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/*
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* REX prefix and bits
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*/
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#define REX_B 1
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#define REX_X 2
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#define REX_R 4
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#define REX_W 8
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#define REX 0x40
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/*
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* Addressing modes
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*/
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@ -585,23 +594,23 @@ static const struct inst db_inst_table[256] = {
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/*3e*/ { "", FALSE, NONE, 0, 0 },
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/*3f*/ { "aas", FALSE, NONE, 0, 0 },
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/*40*/ { "inc", FALSE, LONG, op1(Ri), 0 },
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/*41*/ { "inc", FALSE, LONG, op1(Ri), 0 },
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/*42*/ { "inc", FALSE, LONG, op1(Ri), 0 },
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/*43*/ { "inc", FALSE, LONG, op1(Ri), 0 },
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/*44*/ { "inc", FALSE, LONG, op1(Ri), 0 },
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/*45*/ { "inc", FALSE, LONG, op1(Ri), 0 },
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/*46*/ { "inc", FALSE, LONG, op1(Ri), 0 },
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/*47*/ { "inc", FALSE, LONG, op1(Ri), 0 },
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/*40*/ { "rex", FALSE, NONE, 0, 0 },
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/*41*/ { "rex.b", FALSE, NONE, 0, 0 },
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/*42*/ { "rex.x", FALSE, NONE, 0, 0 },
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/*43*/ { "rex.xb", FALSE, NONE, 0, 0 },
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/*44*/ { "rex.r", FALSE, NONE, 0, 0 },
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/*45*/ { "rex.rb", FALSE, NONE, 0, 0 },
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/*46*/ { "rex.rx", FALSE, NONE, 0, 0 },
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/*47*/ { "rex.rxb", FALSE, NONE, 0, 0 },
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/*48*/ { "dec", FALSE, LONG, op1(Ri), 0 },
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/*49*/ { "dec", FALSE, LONG, op1(Ri), 0 },
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/*4a*/ { "dec", FALSE, LONG, op1(Ri), 0 },
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/*4b*/ { "dec", FALSE, LONG, op1(Ri), 0 },
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/*4c*/ { "dec", FALSE, LONG, op1(Ri), 0 },
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/*4d*/ { "dec", FALSE, LONG, op1(Ri), 0 },
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/*4e*/ { "dec", FALSE, LONG, op1(Ri), 0 },
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/*4f*/ { "dec", FALSE, LONG, op1(Ri), 0 },
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/*48*/ { "rex.w", FALSE, NONE, 0, 0 },
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/*49*/ { "rex.wb", FALSE, NONE, 0, 0 },
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/*4a*/ { "rex.wx", FALSE, NONE, 0, 0 },
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/*4b*/ { "rex.wxb", FALSE, NONE, 0, 0 },
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/*4c*/ { "rex.wr", FALSE, NONE, 0, 0 },
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/*4d*/ { "rex.wrb", FALSE, NONE, 0, 0 },
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/*4e*/ { "rex.wrx", FALSE, NONE, 0, 0 },
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/*4f*/ { "rex.wrxb", FALSE, NONE, 0, 0 },
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/*50*/ { "push", FALSE, LONG, op1(Ri), 0 },
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/*51*/ { "push", FALSE, LONG, op1(Ri), 0 },
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@ -807,13 +816,13 @@ static const struct inst db_bad_inst =
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{ "???", FALSE, NONE, 0, 0 }
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;
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#define f_mod(byte) ((byte)>>6)
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#define f_reg(byte) (((byte)>>3)&0x7)
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#define f_rm(byte) ((byte)&0x7)
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#define f_mod(rex, byte) ((byte)>>6)
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#define f_reg(rex, byte) ((((byte)>>3)&0x7) | (rex & REX_R ? 0x8 : 0x0))
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#define f_rm(rex, byte) (((byte)&0x7) | (rex & REX_B ? 0x8 : 0x0))
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#define sib_ss(byte) ((byte)>>6)
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#define sib_index(byte) (((byte)>>3)&0x7)
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#define sib_base(byte) ((byte)&0x7)
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#define sib_ss(rex, byte) ((byte)>>6)
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#define sib_index(rex, byte) ((((byte)>>3)&0x7) | (rex & REX_X ? 0x8 : 0x0))
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#define sib_base(rex, byte) (((byte)&0x7) | (rex & REX_B ? 0x8 : 0x0))
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struct i_addr {
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int is_reg; /* if reg, reg number is in 'disp' */
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@ -834,10 +843,25 @@ static const char * const db_index_reg_16[8] = {
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"%bx"
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};
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static const char * const db_reg[3][8] = {
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{ "%al", "%cl", "%dl", "%bl", "%ah", "%ch", "%dh", "%bh" },
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{ "%ax", "%cx", "%dx", "%bx", "%sp", "%bp", "%si", "%di" },
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{ "%eax", "%ecx", "%edx", "%ebx", "%esp", "%ebp", "%esi", "%edi" }
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static const char * const db_reg[2][4][16] = {
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{{"%al", "%cl", "%dl", "%bl", "%ah", "%ch", "%dh", "%bh",
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"%r8b", "%r9b", "%r10b", "%r11b", "%r12b", "%r13b", "%r14b", "%r15b" },
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{ "%ax", "%cx", "%dx", "%bx", "%sp", "%bp", "%si", "%di",
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"%r8w", "%r9w", "%r10w", "%r11w", "%r12w", "%r13w", "%r14w", "%r15w" },
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{ "%eax", "%ecx", "%edx", "%ebx", "%esp", "%ebp", "%esi", "%edi",
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"%r8d", "%r9d", "%r10d", "%r11d", "%r12d", "%r13d", "%r14d", "%r15d" },
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{ "%rax", "%rcx", "%rdx", "%rbx", "%rsp", "%rbp", "%rsi", "%rdi",
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"%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15" }},
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{{"%al", "%cl", "%dl", "%bl", "%spl", "%bpl", "%sil", "%dil",
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"%r8b", "%r9b", "%r10b", "%r11b", "%r12b", "%r13b", "%r14b", "%r15b" },
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{ "%ax", "%cx", "%dx", "%bx", "%sp", "%bp", "%si", "%di",
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"%r8w", "%r9w", "%r10w", "%r11w", "%r12w", "%r13w", "%r14w", "%r15w" },
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{ "%eax", "%ecx", "%edx", "%ebx", "%esp", "%ebp", "%esi", "%edi",
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"%r8d", "%r9d", "%r10d", "%r11d", "%r12d", "%r13d", "%r14d", "%r15d" },
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{ "%rax", "%rcx", "%rdx", "%rbx", "%rsp", "%rbp", "%rsi", "%rdi",
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"%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15" }}
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};
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static const char * const db_seg_reg[8] = {
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@ -857,33 +881,35 @@ static const int db_lengths[] = {
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10, /* EXTR */
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};
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#define get_value_inc(result, loc, size, is_signed) \
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result = db_get_value((loc), (size), (is_signed)); \
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(loc) += (size);
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static db_addr_t
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db_disasm_esc(db_addr_t loc, int inst, int short_addr,
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db_disasm_esc(db_addr_t loc, int inst, int rex, int short_addr,
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int size, const char *seg);
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static void db_print_address(const char *seg, int size,
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static void db_print_address(const char *seg, int size, int rex,
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struct i_addr *addrp);
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static db_addr_t
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db_read_address(db_addr_t loc, int short_addr, int regmodrm,
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db_read_address(db_addr_t loc, int short_addr, int rex, int regmodrm,
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struct i_addr *addrp);
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/*
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* Read address at location and return updated location.
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*/
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static db_addr_t
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db_read_address(loc, short_addr, regmodrm, addrp)
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db_read_address(loc, short_addr, rex, regmodrm, addrp)
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db_addr_t loc;
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int short_addr;
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int rex;
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int regmodrm;
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struct i_addr * addrp; /* out */
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{
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int mod, rm, sib, index, disp;
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mod = f_mod(regmodrm);
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rm = f_rm(regmodrm);
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mod = f_mod(rex, regmodrm);
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rm = f_rm(rex, regmodrm);
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if (mod == 3) {
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addrp->is_reg = TRUE;
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@ -924,11 +950,11 @@ db_read_address(loc, short_addr, regmodrm, addrp)
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else {
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if (mod != 3 && rm == 4) {
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get_value_inc(sib, loc, 1, FALSE);
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rm = sib_base(sib);
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index = sib_index(sib);
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rm = sib_base(rex, sib);
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index = sib_index(rex, sib);
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if (index != 4)
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addrp->index = db_reg[LONG][index];
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addrp->ss = sib_ss(sib);
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addrp->index = db_reg[rex != 0 ? 1 : 0][(rex & REX_R) ? QUAD : LONG][index];
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addrp->ss = sib_ss(rex, sib);
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}
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switch (mod) {
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@ -939,20 +965,20 @@ db_read_address(loc, short_addr, regmodrm, addrp)
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}
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else {
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addrp->disp = 0;
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addrp->base = db_reg[LONG][rm];
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addrp->base = db_reg[rex != 0 ? 1 : 0][(rex & REX_R) ? QUAD : LONG][rm];
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}
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break;
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case 1:
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get_value_inc(disp, loc, 1, TRUE);
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addrp->disp = disp;
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addrp->base = db_reg[LONG][rm];
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addrp->base = db_reg[rex != 0 ? 1 : 0][(rex & REX_R) ? QUAD : LONG][rm];
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break;
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case 2:
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get_value_inc(disp, loc, 4, FALSE);
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addrp->disp = disp;
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addrp->base = db_reg[LONG][rm];
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addrp->base = db_reg[rex != 0 ? 1 : 0][(rex & REX_R) ? QUAD : LONG][rm];
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break;
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}
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}
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@ -960,13 +986,14 @@ db_read_address(loc, short_addr, regmodrm, addrp)
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}
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static void
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db_print_address(seg, size, addrp)
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db_print_address(seg, size, rex, addrp)
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const char * seg;
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int size;
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int rex;
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struct i_addr * addrp;
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{
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if (addrp->is_reg) {
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db_printf("%s", db_reg[size][addrp->disp]);
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db_printf("%s", db_reg[rex != 0 ? 1 : 0][size][addrp->disp]);
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return;
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}
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@ -990,9 +1017,10 @@ db_print_address(seg, size, addrp)
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* and return updated location.
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*/
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static db_addr_t
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db_disasm_esc(loc, inst, short_addr, size, seg)
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db_disasm_esc(loc, inst, rex, short_addr, size, seg)
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db_addr_t loc;
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int inst;
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int rex;
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int short_addr;
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int size;
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const char * seg;
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@ -1004,8 +1032,8 @@ db_disasm_esc(loc, inst, short_addr, size, seg)
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const char * name;
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get_value_inc(regmodrm, loc, 1, FALSE);
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fp = &db_Esc_inst[inst - 0xd8][f_reg(regmodrm)];
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mod = f_mod(regmodrm);
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fp = &db_Esc_inst[inst - 0xd8][f_reg(rex, regmodrm)];
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mod = f_mod(rex, regmodrm);
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if (mod != 3) {
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if (*fp->f_name == '\0') {
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db_printf("<bad instruction>");
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@ -1014,7 +1042,7 @@ db_disasm_esc(loc, inst, short_addr, size, seg)
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/*
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* Normal address modes.
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*/
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loc = db_read_address(loc, short_addr, regmodrm, &address);
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loc = db_read_address(loc, short_addr, rex, regmodrm, &address);
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db_printf("%s", fp->f_name);
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switch(fp->f_size) {
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case SNGL:
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@ -1039,7 +1067,7 @@ db_disasm_esc(loc, inst, short_addr, size, seg)
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break;
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}
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db_printf("\t");
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db_print_address(seg, BYTE, &address);
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db_print_address(seg, BYTE, rex, &address);
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}
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else {
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/*
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@ -1048,24 +1076,24 @@ db_disasm_esc(loc, inst, short_addr, size, seg)
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switch (fp->f_rrmode) {
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case op2(ST,STI):
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name = (fp->f_rrname) ? fp->f_rrname : fp->f_name;
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db_printf("%s\t%%st,%%st(%d)",name,f_rm(regmodrm));
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db_printf("%s\t%%st,%%st(%d)",name,f_rm(rex, regmodrm));
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break;
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case op2(STI,ST):
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name = (fp->f_rrname) ? fp->f_rrname : fp->f_name;
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db_printf("%s\t%%st(%d),%%st",name, f_rm(regmodrm));
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db_printf("%s\t%%st(%d),%%st",name, f_rm(rex, regmodrm));
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break;
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case op1(STI):
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name = (fp->f_rrname) ? fp->f_rrname : fp->f_name;
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db_printf("%s\t%%st(%d)",name, f_rm(regmodrm));
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db_printf("%s\t%%st(%d)",name, f_rm(rex, regmodrm));
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break;
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case op1(X):
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name = ((const char * const *)fp->f_rrname)[f_rm(regmodrm)];
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name = ((const char * const *)fp->f_rrname)[f_rm(rex, regmodrm)];
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if (*name == '\0')
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goto bad;
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db_printf("%s", name);
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break;
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case op1(XA):
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name = ((const char * const *)fp->f_rrname)[f_rm(regmodrm)];
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name = ((const char * const *)fp->f_rrname)[f_rm(rex, regmodrm)];
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if (*name == '\0')
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goto bad;
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db_printf("%s\t%%ax", name);
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@ -1098,6 +1126,7 @@ db_disasm(loc, altfmt)
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const char * i_name;
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int i_size;
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int i_mode;
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int rex = 0;
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int regmodrm = 0;
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boolean_t first;
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int displ;
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@ -1155,13 +1184,17 @@ db_disasm(loc, altfmt)
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prefix = FALSE;
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break;
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}
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if (inst >= 0x40 && inst < 0x50) {
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rex = inst;
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prefix = TRUE;
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}
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if (prefix) {
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get_value_inc(inst, loc, 1, FALSE);
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}
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} while (prefix);
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if (inst >= 0xd8 && inst <= 0xdf) {
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loc = db_disasm_esc(loc, inst, short_addr, size, seg);
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loc = db_disasm_esc(loc, inst, rex, short_addr, size, seg);
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db_printf("\n");
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return (loc);
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}
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@ -1181,7 +1214,7 @@ db_disasm(loc, altfmt)
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if (ip->i_has_modrm) {
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get_value_inc(regmodrm, loc, 1, FALSE);
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loc = db_read_address(loc, short_addr, regmodrm, &address);
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loc = db_read_address(loc, short_addr, rex, regmodrm, &address);
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}
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i_name = ip->i_name;
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@ -1191,17 +1224,17 @@ db_disasm(loc, altfmt)
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if (ip->i_extra == db_Grp1 || ip->i_extra == db_Grp2 ||
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ip->i_extra == db_Grp6 || ip->i_extra == db_Grp7 ||
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ip->i_extra == db_Grp8 || ip->i_extra == db_Grp9) {
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i_name = ((const char * const *)ip->i_extra)[f_reg(regmodrm)];
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i_name = ((const char * const *)ip->i_extra)[f_reg(rex, regmodrm)];
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}
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else if (ip->i_extra == db_Grp3) {
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ip = ip->i_extra;
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ip = &ip[f_reg(regmodrm)];
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ip = &ip[f_reg(rex, regmodrm)];
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i_name = ip->i_name;
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i_mode = ip->i_mode;
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}
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else if (ip->i_extra == db_Grp4 || ip->i_extra == db_Grp5) {
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ip = ip->i_extra;
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ip = &ip[f_reg(regmodrm)];
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ip = &ip[f_reg(rex, regmodrm)];
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i_name = ip->i_name;
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i_mode = ip->i_mode;
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i_size = ip->i_size;
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@ -1226,8 +1259,12 @@ db_disasm(loc, altfmt)
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}
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else if (size == WORD)
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db_printf("w");
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else
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db_printf("l");
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else {
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if (rex & REX_W)
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db_printf("q");
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else
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db_printf("l");
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}
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}
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}
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db_printf("\t");
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@ -1241,52 +1278,52 @@ db_disasm(loc, altfmt)
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switch (i_mode & 0xFF) {
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case E:
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db_print_address(seg, size, &address);
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db_print_address(seg, size, rex, &address);
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break;
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case Eind:
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db_printf("*");
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db_print_address(seg, size, &address);
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db_print_address(seg, size, rex, &address);
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break;
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case El:
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db_print_address(seg, LONG, &address);
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db_print_address(seg, (rex & REX_W) ? QUAD : LONG, rex, &address);
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break;
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case Ew:
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db_print_address(seg, WORD, &address);
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db_print_address(seg, WORD, rex, &address);
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break;
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case Eb:
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db_print_address(seg, BYTE, &address);
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db_print_address(seg, BYTE, rex, &address);
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break;
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case R:
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db_printf("%s", db_reg[size][f_reg(regmodrm)]);
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db_printf("%s", db_reg[rex != 0 ? 1 : 0][size][f_reg(rex, regmodrm)]);
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break;
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case Rw:
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db_printf("%s", db_reg[WORD][f_reg(regmodrm)]);
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||||
db_printf("%s", db_reg[rex != 0 ? 1 : 0][WORD][f_reg(rex, regmodrm)]);
|
||||
break;
|
||||
|
||||
case Ri:
|
||||
db_printf("%s", db_reg[size][f_rm(inst)]);
|
||||
db_printf("%s", db_reg[rex != 0 ? 1 : 0][size][f_rm(rex, inst)]);
|
||||
break;
|
||||
|
||||
case Ril:
|
||||
db_printf("%s", db_reg[LONG][f_rm(inst)]);
|
||||
db_printf("%s", db_reg[rex != 0 ? 1 : 0][(rex & REX_R) ? QUAD : LONG][f_rm(rex, inst)]);
|
||||
break;
|
||||
|
||||
case S:
|
||||
db_printf("%s", db_seg_reg[f_reg(regmodrm)]);
|
||||
db_printf("%s", db_seg_reg[f_reg(rex, regmodrm)]);
|
||||
break;
|
||||
|
||||
case Si:
|
||||
db_printf("%s", db_seg_reg[f_reg(inst)]);
|
||||
db_printf("%s", db_seg_reg[f_reg(rex, inst)]);
|
||||
break;
|
||||
|
||||
case A:
|
||||
db_printf("%s", db_reg[size][0]); /* acc */
|
||||
db_printf("%s", db_reg[rex != 0 ? 1 : 0][size][0]); /* acc */
|
||||
break;
|
||||
|
||||
case BX:
|
||||
@ -1306,33 +1343,33 @@ db_disasm(loc, altfmt)
|
||||
case SI:
|
||||
if (seg)
|
||||
db_printf("%s:", seg);
|
||||
db_printf("(%s)", short_addr ? "%si" : "%esi");
|
||||
db_printf("(%s)", short_addr ? "%si" : "%rsi");
|
||||
break;
|
||||
|
||||
case DI:
|
||||
db_printf("%%es:(%s)", short_addr ? "%di" : "%edi");
|
||||
db_printf("%%es:(%s)", short_addr ? "%di" : "%rdi");
|
||||
break;
|
||||
|
||||
case CR:
|
||||
db_printf("%%cr%d", f_reg(regmodrm));
|
||||
db_printf("%%cr%d", f_reg(rex, regmodrm));
|
||||
break;
|
||||
|
||||
case DR:
|
||||
db_printf("%%dr%d", f_reg(regmodrm));
|
||||
db_printf("%%dr%d", f_reg(rex, regmodrm));
|
||||
break;
|
||||
|
||||
case TR:
|
||||
db_printf("%%tr%d", f_reg(regmodrm));
|
||||
db_printf("%%tr%d", f_reg(rex, regmodrm));
|
||||
break;
|
||||
|
||||
case I:
|
||||
len = db_lengths[size];
|
||||
len = db_lengths[(size == LONG && (rex & REX_W)) ? QUAD : size];
|
||||
get_value_inc(imm, loc, len, FALSE);
|
||||
db_printf("$%#r", imm);
|
||||
break;
|
||||
|
||||
case Is:
|
||||
len = db_lengths[size];
|
||||
len = db_lengths[(size == LONG && (rex & REX_W)) ? QUAD : size];
|
||||
get_value_inc(imm, loc, len, FALSE);
|
||||
db_printf("$%+#r", imm);
|
||||
break;
|
||||
@ -1378,7 +1415,7 @@ db_disasm(loc, altfmt)
|
||||
break;
|
||||
|
||||
case Dl:
|
||||
len = db_lengths[size];
|
||||
len = db_lengths[(size == LONG && (rex & REX_W)) ? QUAD : size];
|
||||
get_value_inc(displ, loc, len, FALSE);
|
||||
displ += loc;
|
||||
if (size == WORD)
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user