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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "third_party/xed/x86.h"
#include "tool/build/lib/address.h"
#include "tool/build/lib/endian.h"
#include "tool/build/lib/modrm.h"
#include "tool/build/lib/throw.h"
uint64_t AddressOb(struct Machine *m, uint32_t rde) {
return AddSegment(m, rde, m->xedd->op.disp, m->ds);
}
uint8_t *GetSegment(struct Machine *m, uint32_t rde, int s) {
switch (s & 7) {
case 0:
return m->es;
case 1:
return m->cs;
case 2:
return m->ss;
case 3:
return m->ds;
case 4:
return m->fs;
case 5:
return m->gs;
case 6:
case 7:
OpUd(m, rde);
default:
unreachable;
}
}
uint64_t AddSegment(struct Machine *m, uint32_t rde, uint64_t i, uint8_t s[8]) {
if (!Sego(rde)) {
return i + Read64(s);
} else {
return i + Read64(GetSegment(m, rde, Sego(rde) - 1));
}
}
uint64_t DataSegment(struct Machine *m, uint32_t rde, uint64_t i) {
return AddSegment(m, rde, i, m->ds);
}
uint64_t AddressSi(struct Machine *m, uint32_t rde) {
switch (Eamode(rde)) {
case XED_MODE_LONG:
return DataSegment(m, rde, Read64(m->si));
case XED_MODE_REAL:
return DataSegment(m, rde, Read16(m->si));
case XED_MODE_LEGACY:
return DataSegment(m, rde, Read32(m->si));
default:
unreachable;
}
}
uint64_t AddressDi(struct Machine *m, uint32_t rde) {
uint64_t i = Read64(m->es);
switch (Eamode(rde)) {
case XED_MODE_LONG:
return i + Read64(m->di);
case XED_MODE_REAL:
return i + Read16(m->di);
case XED_MODE_LEGACY:
return i + Read32(m->di);
default:
unreachable;
}
}