mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-05-24 06:12:27 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

Make improvements

Browse source 
- Emulator can now test the αcτµαlly pδrταblε εxεcµταblε bootloader

- Whipped up a webserver named redbean. It services 150k requests per
  second on a single core. Bundling assets inside zip enables extremely
  fast serving for two reasons. The first is that zip central directory
  lookups go faster than stat() system calls. The second is that both
  zip and gzip content-encoding use DEFLATE, therefore, compressed
  responses can be served via the sendfile() system call which does an
  in-kernel copy directly from the zip executable structure. Also note
  that red bean zip executables can be deployed easily to all platforms,
  since these native executables work on Linux, Mac, BSD, and Windows.

- Address sanitizer now works very well
This commit is contained in:
Justine Tunney 2020-09-06 21:39:00 -07:00
parent 7327c345f9
commit 416fd86676
230 changed files with 9835 additions and 5682 deletions
Download patch file Download diff file Expand all files Collapse all files

101
tool/build/lib/modrm.c
View file

@ -18,37 +18,104 @@
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/log/check.h"
#include "third_party/xed/x86.h"
#include "tool/build/lib/address.h"
#include "tool/build/lib/endian.h"
#include "tool/build/lib/machine.h"
#include "tool/build/lib/memory.h"
#include "tool/build/lib/modrm.h"
#include "tool/build/lib/throw.h"
/**
* Computes virtual address based on modrm and sib bytes.
* Byte register offsets.
*
* for (i = 0; i < 2; ++i) { // rex
* for (j = 0; j < 2; ++j) { // rexb, or rexr
* for (k = 0; k < 8; ++k) { // reg, rm, or srm
* kByteReg[i << 4 | j << 3 | k] =
* i ? (j << 3 | k) * 8 : (k & 0b11) * 8 + ((k & 0b100) >> 2);
* }
* }
* }
*/
const uint8_t kByteReg[32] = {0x00, 0x08, 0x10, 0x18, 0x01, 0x09, 0x11, 0x19,
0x00, 0x08, 0x10, 0x18, 0x01, 0x09, 0x11, 0x19,
0x00, 0x08, 0x10, 0x18, 0x20, 0x28, 0x30, 0x38,
0x40, 0x48, 0x50, 0x58, 0x60, 0x68, 0x70, 0x78};
int64_t ComputeAddress(const struct Machine *m, uint32_t rde) {
uint64_t i;
DCHECK(m->xedd->op.has_modrm);
uint8_t *s;
DCHECK(!IsModrmRegister(rde));
s = m->ds;
i = m->xedd->op.disp;
if (!SibExists(rde)) {
if (IsRipRelative(rde)) {
i += m->ip;
if (Eamode(rde) != XED_MODE_REAL) {
if (!SibExists(rde)) {
if (IsRipRelative(rde)) {
if (Mode(rde) == XED_MODE_LONG) {
i += m->ip;
}
} else {
i += Read64(RegRexbRm(m, rde));
if (RexbRm(rde) == 4 || RexbRm(rde) == 5) {
s = m->ss;
}
}
} else {
i += Read64(RegRexbRm(m, rde));
if (SibHasBase(m->xedd, rde)) {
i += Read64(RegRexbBase(m, rde));
if (RexbBase(m, rde) == 4 || RexbBase(m, rde) == 5) {
s = m->ss;
}
}
if (SibHasIndex(m->xedd)) {
i += Read64(RegRexxIndex(m)) << m->xedd->op.scale;
}
}
if (Eamode(rde) == XED_MODE_LEGACY) {
i &= 0xffffffff;
}
} else {
DCHECK(m->xedd->op.has_sib);
if (SibHasBase(rde)) {
i += Read64(RegRexbBase(m, rde));
}
if (SibHasIndex(rde)) {
i += Read64(RegRexxIndex(m, rde)) << m->xedd->op.scale;
switch (ModrmRm(rde)) {
case 0:
i += Read16(m->bx);
i += Read16(m->si);
break;
case 1:
i += Read16(m->bx);
i += Read16(m->di);
break;
case 2:
s = m->ss;
i += Read16(m->bp);
i += Read16(m->si);
break;
case 3:
s = m->ss;
i += Read16(m->bp);
i += Read16(m->di);
break;
case 4:
i += Read16(m->si);
break;
case 5:
i += Read16(m->di);
break;
case 6:
if (ModrmMod(rde)) {
s = m->ss;
i += Read16(m->bp);
}
break;
case 7:
i += Read16(m->bx);
break;
default:
unreachable;
}
i &= 0xffff;
}
i += GetSegment(m);
if (Asz(rde)) i &= 0xffffffff;
return i;
return AddSegment(m, rde, i, s);
}
void *ComputeReserveAddressRead(struct Machine *m, uint32_t rde, size_t n) {
@ -62,6 +129,10 @@ void *ComputeReserveAddressRead1(struct Machine *m, uint32_t rde) {
return ComputeReserveAddressRead(m, rde, 1);
}
void *ComputeReserveAddressRead4(struct Machine *m, uint32_t rde) {
return ComputeReserveAddressRead(m, rde, 4);
}
void *ComputeReserveAddressRead8(struct Machine *m, uint32_t rde) {
return ComputeReserveAddressRead(m, rde, 8);
}