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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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30
libc/nexgen32e/gc.S
View file

@ -33,9 +33,10 @@
/ @param rax,rdx,xmm0,xmm1,st0,st1 is return value
/ @see test/libc/runtime/gc_test.c
/ <LIMBO>
__gc: decq __garbage(%rip)
mov __garbage(%rip),%r8
mov __garbage+16(%rip),%r9
CollectGarbage:
decq g_garbage(%rip)
mov g_garbage(%rip),%r8
mov g_garbage+16(%rip),%r9
js 9f
shl $5,%r8
lea (%r9,%r8),%r8
@ -45,28 +46,25 @@ __gc: decq __garbage(%rip)
/ </LIMBO>
push %rbp
mov %rsp,%rbp
sub $0x40,%rsp
sub $0x20,%rsp
push %rax
push %rdx
fstpl -0x40(%rbp)
fstpl -0x30(%rbp)
movaps %xmm0,-0x20(%rbp)
movaps %xmm1,-0x10(%rbp)
call *%r9
movaps -0x10(%rbp),%xmm1
movaps -0x20(%rbp),%xmm0
fldl -0x30(%rbp)
fldl -0x40(%rbp)
pop %rdx
pop %rax
leave
ret
9: call abort
.endfn __gc,globl,hidden
.endfn CollectGarbage,globl,hidden
.source __FILE__
.bss
.align 8
__garbage:
g_garbage:
.quad 0 # garbage.i
.quad 0 # garbage.n
.quad 0 # garbage.p
@ -76,16 +74,10 @@ __garbage:
.quad 0 # garbage.p[𝑖].arg
.quad 0 # garbage.p[𝑖].ret
.endr
.endobj __garbage,globl,hidden
.endobj g_garbage,globl,hidden
.previous
.init.start 100,_init_garbage
push %rdi
ezlea __garbage+8,di
pushpop INITIAL_CAPACITY,%rax
stosq
lea 8(%rdi),%rax
stosq
pop %rdi
movb $INITIAL_CAPACITY,g_garbage+8(%rip)
movl $g_garbage+24,g_garbage+16(%rip)
.init.end 100,_init_garbage
.source __FILE__