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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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29
libc/nexgen32e/memcpy.S
View file

@ -46,17 +46,17 @@
.source __FILE__
memcpy: mov %rdi,%rax
/ 𝑠𝑙𝑖𝑑𝑒
.endfn memcpy,globl
/ Copies memory w/ minimal impact ABI.
/
/ @param rdi is dest
/ @param rsi is src
/ @param rdx is number of bytes
/ @clob flags,xmm3
/ @clob flags,xmm3,xmm4
/ @mode long
.align 16
_memcpy:.leafprologue
.profilable
MemCpy: .leafprologue
push %rcx
mov $.Lmemcpytab.ro.size,%ecx
cmp %rcx,%rdx
@ -65,27 +65,29 @@ _memcpy:.leafprologue
.Lanchorpoint:
.L32r: cmp $1024,%rdx
jae .Lerms
.L32: mov $32,%rcx
.L32: vmovdqu -32(%rsi,%rdx),%ymm4
mov $32,%rcx
0: add $32,%rcx
vmovdqu -64(%rsi,%rcx),%ymm3
vmovdqu %ymm3,-64(%rdi,%rcx)
cmp %rcx,%rdx
ja 0b
vmovdqu -32(%rsi,%rdx),%ymm3
vmovdqu %ymm3,-32(%rdi,%rdx)
vxorps %ymm3,%ymm3,%ymm3
vmovdqu %ymm4,-32(%rdi,%rdx)
vpxor %ymm4,%ymm4,%ymm4
vpxor %ymm3,%ymm3,%ymm3
jmp .L0
.L16r: cmp $1024,%rdx
jae .Lerms
.L16: mov $16,%rcx
.L16: movdqu -16(%rsi,%rdx),%xmm4
mov $16,%rcx
0: add $16,%rcx
movdqu -32(%rsi,%rcx),%xmm3
movdqu %xmm3,-32(%rdi,%rcx)
cmp %rcx,%rdx
ja 0b
movdqu -16(%rsi,%rdx),%xmm3
movdqu %xmm3,-16(%rdi,%rdx)
xorps %xmm3,%xmm3
movdqu %xmm4,-16(%rdi,%rdx)
pxor %xmm4,%xmm4
pxor %xmm3,%xmm3
jmp .L0
.L8: push %rbx
mov (%rsi),%rcx
@ -134,10 +136,9 @@ _memcpy:.leafprologue
sfence
movdqu -16(%rsi,%rdx),%xmm3
movdqu %xmm3,-16(%rdi,%rdx)
xorps %xmm3,%xmm3
pxor %xmm3,%xmm3
jmp .L0
.endfn _memcpy,globl,hidden
.endfn memcpy,globl
.endfn MemCpy,globl,hidden
.initro 300,_init_memcpy
memcpytab.ro: