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Add x86_64-linux-gnu emulator

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I wanted a tiny scriptable meltdown proof way to run userspace programs
and visualize how program execution impacts memory. It helps to explain
how things like Actually Portable Executable works. It can show you how
the GCC generated code is going about manipulating matrices and more. I
didn't feel fully comfortable with Qemu and Bochs because I'm not smart
enough to understand them. I wanted something like gVisor but with much
stronger levels of assurances. I wanted a single binary that'll run, on
all major operating systems with an embedded GPL barrier ZIP filesystem
that is tiny enough to transpile to JavaScript and run in browsers too.

https://justine.storage.googleapis.com/emulator625.mp4
This commit is contained in:
Justine Tunney
2020-08-25 04:23:25 -07:00
parent 467504308a
commit f4f4caab0e
1052 changed files with 65667 additions and 7825 deletions
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25
libc/nexgen32e/strsak.S
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@@ -18,6 +18,7 @@
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/nexgen32e/x86feature.h"
#include "libc/nexgen32e/macros.h"
#include "libc/macros.h"
.source __FILE__
@@ -32,6 +33,7 @@ strchrnul:
.profilable
or $-1,%r9
jmp 0f
.endfn strchrnul,globl
/ Returns pointer to first instance of character, the BSD way.
/
@@ -41,6 +43,7 @@ strchrnul:
/ @note this won't return NULL if search character is NUL
index: nop
/ 𝑠𝑙𝑖𝑑𝑒
.endfn index,globl
/ Returns pointer to first instance of character.
/
@@ -56,6 +59,7 @@ strchr: .leafprologue
or $-1,%rsi
xor %r8,%r8
jmp strsak
.endfn strchr,globl
/ Returns pointer to first instance of character in range.
/
@@ -65,6 +69,7 @@ strchr: .leafprologue
rawmemchr:
or $-1,%rdx
/ 𝑠𝑙𝑖𝑑𝑒
.endfn rawmemchr,globl
/ Returns pointer to first instance of character in range.
/
@@ -80,6 +85,7 @@ memchr: .leafprologue
xor %r8,%r8
xor %r10,%r10
jmp strsak
.endfn memchr,globl
/ Returns length of NUL-terminated string w/ security blankets.
/
@@ -97,6 +103,7 @@ strnlen_s:
test %rdi,%rdi
jnz 0f
.leafepilogue
.endfn strnlen_s,globl
/ Returns length of NUL-terminated string.
/
@@ -105,6 +112,7 @@ strnlen_s:
/ @asyncsignalsafe
strlen: or $-1,%rsi
/ 𝑠𝑙𝑖𝑑𝑒
.endfn strlen,globl
/ Returns length of NUL-terminated memory, with limit.
/
@@ -118,6 +126,7 @@ strnlen:.leafprologue
0: xor %edx,%edx
mov %rdi,%r8
/ 𝑠𝑙𝑖𝑑𝑒
.endfn strnlen,globl
/ Swiss army knife of string character scanning.
/ Sixteen fast functions in one.
@@ -175,12 +184,8 @@ strsak: lea -1(%rdi),%rax
2: add %rcx,%rax
jmp .Lbyte
#if !X86_NEED(AVX2)
.Lsse2: punpcklbw %xmm0,%xmm0
pshuflw $0xe0,%xmm0,%xmm0
pshufd $0x00,%xmm0,%xmm0
punpcklbw %xmm1,%xmm1
pshuflw $0xe0,%xmm1,%xmm1
pshufd $0x00,%xmm1,%xmm1
.Lsse2: pbroadcastb %xmm0
pbroadcastb %xmm1
1: add $32,%rax
sub $32,%rsi
jb 9b
@@ -203,14 +208,6 @@ strsak: lea -1(%rdi),%rax
jmp 2b
#endif
.endfn strsak,globl,hidden
.endfn strnlen,globl
.endfn strlen,globl
.endfn strnlen_s,globl
.endfn memchr,globl
.endfn rawmemchr,globl
.endfn strchr,globl
.endfn index,globl
.endfn strchrnul,globl
/* benchmarked on intel core i7-6700 @ 3.40GHz (skylake)
includes function call overhead (unless marked otherwise)