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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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21
libc/tinymath/ilogbf.S
View file

@ -18,10 +18,25 @@
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/macros.h"
.source __FILE__
/ Returns log₂ₓ exponent part of float.
/
/ @param 𝑥 is float passed in %xmm0
/ @return result in %eax
/ @note needs sse3
tinymath_ilogbf:
ezlea tinymath_ilogbl,ax
jmp _f2ld2
push %rbp
mov %rsp,%rbp
.profilable
push %rax
movss %xmm0,(%rsp)
flds (%rsp)
fxtract
fstp %st
fisttpl (%rsp)
mov (%rsp),%eax
leave
ret
.endfn tinymath_ilogbf,globl
.alias tinymath_ilogbf,ilogbf
.source __FILE__