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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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48
libc/bits/bswap.h Normal file
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#ifndef COSMOPOLITAN_LIBC_BITS_BSWAP_H_
#define COSMOPOLITAN_LIBC_BITS_BSWAP_H_
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
uint16_t bswap_16(uint16_t) pureconst;
uint32_t bswap_32(uint32_t) pureconst;
uint32_t bswap_64(uint32_t) pureconst;
#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
#define bswap_16(U16) \
(isconstant(U16) ? ((((U16)&0xff00) >> 010) | (((U16)&0x00ff) << 010)) : ({ \
uint16_t Swapped16, Werd16 = (U16); \
asm("xchg\t%b0,%h0" : "=Q"(Swapped16) : "0"(Werd16)); \
Swapped16; \
}))
#define bswap_32(U32) \
(isconstant(U32) \
? ((((U32)&0xff000000) >> 030) | (((U32)&0x000000ff) << 030) | \
(((U32)&0x00ff0000) >> 010) | (((U32)&0x0000ff00) << 010)) \
: ({ \
uint32_t Swapped32, Werd32 = (U32); \
asm("bswap\t%0" : "=r"(Swapped32) : "0"(Werd32)); \
Swapped32; \
}))
#define bswap_64(U64) \
(isconstant(U64) ? ((((U64)&0xff00000000000000ul) >> 070) | \
(((U64)&0x00000000000000fful) << 070) | \
(((U64)&0x00ff000000000000ul) >> 050) | \
(((U64)&0x000000000000ff00ul) << 050) | \
(((U64)&0x0000ff0000000000ul) >> 030) | \
(((U64)&0x0000000000ff0000ul) << 030) | \
(((U64)&0x000000ff00000000ul) >> 010) | \
(((U64)&0x00000000ff000000ul) << 010)) \
: ({ \
uint64_t Swapped64, Werd64 = (U64); \
asm("bswap\t%0" : "=r"(Swapped64) : "0"(Werd64)); \
Swapped64; \
}))
#endif /* defined(__GNUC__) && !defined(__STRICT_ANSI__) */
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_BITS_BSWAP_H_ */