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cosmopolitan/tool/build/lib/pml4t.h

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Add x86_64-linux-gnu emulator 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
2020-08-25 11:23:25 +00:00
#ifndef COSMOPOLITAN_TOOL_BUILD_LIB_PML4T_H_
#define COSMOPOLITAN_TOOL_BUILD_LIB_PML4T_H_
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
#define IsValidPage(x) ((x)&1)
#define UnmaskPageAddr(x) ((void *)SignExtendAddr(MaskPageAddr(x)))
#define MaskPageAddr(x) ((int64_t)(intptr_t)(x)&0x00007ffffffff000)
#define SignExtendAddr(x) (!((x)&0x800000000000) ? (x) : (x) | -0x800000000000)
typedef uint64_t pml4t_t[512] aligned(4096);
int FreePml4t(pml4t_t, int64_t, uint64_t, void (*)(void *),
int (*)(void *, size_t));
int RegisterPml4t(pml4t_t, int64_t, int64_t, size_t, void *(*)(void));
Fix bugs and have emulator emulate itself
2020-08-31 12:17:31 +00:00
int64_t FindPml4t(pml4t_t, uint64_t, uint64_t);
Add x86_64-linux-gnu emulator 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
2020-08-25 11:23:25 +00:00
char *FormatPml4t(pml4t_t) nodiscard;
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_TOOL_BUILD_LIB_PML4T_H_ */