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format: Generalize ENTER/JMPF/CALLF op. formatting

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This commit is contained in:
Alexis Engelke
2021-01-10 15:15:30 +01:00
parent c050b34ff9
commit 51072cac9c
1 changed files with 30 additions and 42 deletions
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72
format.c
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@@ -178,44 +178,6 @@ fd_format_abs(const FdInstr* instr, uint64_t addr, char* buffer, size_t len)
case 8: mnemonic = "jrcxz"; break;
}
break;
case FDI_ENTER: {
buf = fd_strplcpy(buf, mnemonic, end-buf);
if (FD_OPSIZE(instr) == 2)
buf = fd_strplcpy(buf, "w", end-buf);
char* fmt = fd_format_hex(FD_OP_IMM(instr, 0) & 0xffff, tmp + 3);
*--fmt = 'x';
*--fmt = '0';
*--fmt = ' ';
buf = fd_strplcpy(buf, fmt, end-buf);
fmt = fd_format_hex(FD_OP_IMM(instr, 0) >> 16, tmp + 4);
*--fmt = 'x';
*--fmt = '0';
*--fmt = ' ';
*--fmt = ',';
buf = fd_strplcpy(buf, fmt, end-buf);
return;
}
case FDI_JMPF:
case FDI_CALLF:
if (FD_OP_TYPE(instr, 0) == FD_OT_IMM) {
buf = fd_strplcpy(buf, mnemonic, end-buf);
uint32_t tgt = FD_OP_IMM(instr, 0) & 0xffffffff;
if (FD_OP_SIZE(instr, 0) == 2)
tgt &= 0xffff;
unsigned seg = FD_OP_IMM(instr, 0) >> 8*FD_OP_SIZE(instr, 0);
char* fmt = fd_format_hex(seg & 0xffff, tmp + 3);
*--fmt = 'x';
*--fmt = '0';
*--fmt = ' ';
buf = fd_strplcpy(buf, fmt, end-buf);
fmt = fd_format_hex(tgt, tmp + 3);
*--fmt = 'x';
*--fmt = '0';
*--fmt = ':';
buf = fd_strplcpy(buf, fmt, end-buf);
return;
}
break;
case FDI_PUSH:
if (FD_OP_SIZE(instr, 0) == 2 && FD_OP_TYPE(instr, 0) == FD_OT_IMM)
sizesuffix[0] = 'w';
@@ -239,6 +201,7 @@ fd_format_abs(const FdInstr* instr, uint64_t addr, char* buffer, size_t len)
sizesuffix[0] = 0;
break;
case FDI_RET:
case FDI_ENTER:
case FDI_LEAVE:
if (FD_OPSIZE(instr) == (FD_IS64(instr) ? 8 : 4))
sizesuffix[0] = 0;
@@ -372,15 +335,40 @@ fd_format_abs(const FdInstr* instr, uint64_t addr, char* buffer, size_t len)
buf = fd_strplcpy(buf, "]", end-buf);
} else if (op_type == FD_OT_IMM || op_type == FD_OT_OFF) {
size_t immediate = FD_OP_IMM(instr, i);
// Some instructions have actually two immediate operands which are
// decoded as a single operand. Split them here appropriately.
size_t splitimm = 0;
const char* splitsep = ", ";
switch (FD_TYPE(instr)) {
default:
goto nosplitimm;
case FDI_ENTER:
splitimm = immediate & 0xffff;
immediate = (immediate >> 16) & 0xff;
break;
case FDI_JMPF:
case FDI_CALLF:
splitsep = ":";
splitimm = (immediate >> 8*size) & 0xffff;
// immediate is masked below.
break;
}
char* fmt = fd_format_hex(splitimm, tmp + 2);
*--fmt = 'x';
*--fmt = '0';
buf = fd_strplcpy(buf, fmt, end-buf);
buf = fd_strplcpy(buf, splitsep, end-buf);
nosplitimm:
if (op_type == FD_OT_OFF)
immediate += addr + FD_SIZE(instr);
if (FD_OP_SIZE(instr, i) == 1)
if (size == 1)
immediate &= 0xff;
else if (FD_OP_SIZE(instr, i) == 2)
else if (size == 2)
immediate &= 0xffff;
else if (FD_OP_SIZE(instr, i) == 4)
else if (size == 4)
immediate &= 0xffffffff;
char* fmt = fd_format_hex(immediate, tmp + 2);
fmt = fd_format_hex(immediate, tmp + 2);
*--fmt = 'x';
*--fmt = '0';
buf = fd_strplcpy(buf, fmt, end-buf);