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Add support for dword offsets (#4825)

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* Add support for dword offsets to internal assembler

Internal assembler produces incorrect opcodes for offsets that were
greater than a short.

    rasm2 "mov eax, [eax + 1337]"
    8b8039

This adds support for values >127.

    rasm2 "mov eax, [eax + 1337]"
    8b8039050000

producing the same output as the `nasm` assembler.

* Fix support for negative short and dword offsets

Handle negative offsets for `mov` instructions both short and dword
sizes.

* Whitespace fixes

* Remove rogue character

Remove the reogue `:` that got into the code
This commit is contained in:
Sven Steinbauer 2016-05-09 14:25:20 +01:00 committed by radare
parent a68955c268
commit 766b9ec4f0
1 changed files with 16 additions and 4 deletions
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20
libr/asm/p/asm_x86_nz.c
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@ -1082,14 +1082,26 @@ SETNP/SETPO - Set if No Parity / Set if Parity Odd (386+)
}
data[l++] = 0x8b;
if (delta) {
ut8 mask = 0x40;
ut32 d = r_num_math (NULL, delta) * N;
// Check if delta is short or dword
if ((ST8_MIN > d) && (d > ST8_MAX)) {
mask = 0x80;
}
int r = getreg (arg2);
if (r==4) { //ESP
data[l++] = getreg (arg)<<3 | r | 0x40;
data[l++] = getreg (arg)<<3 | r | mask;
data[l++] = 0x24;
} else if (r==5) { // EBP
data[l++] = getreg (arg)<<3 | r | 0x40;
} else data[l++] = getreg (arg)<<3 | r | 0x40;
data[l++] = r_num_math (NULL, delta) * N;
data[l++] = getreg (arg)<<3 | r | mask;
} else data[l++] = getreg (arg)<<3 | r | mask;
data[l++] = d;
if ((ST8_MIN > d) && (d > ST8_MAX)) {
data[l++] = d>>8;
data[l++] = d>>16;
data[l++] = d>>24;
}
} else {
int r = getreg (arg2);
if (r==4) { //ESP