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https://github.com/jart/cosmopolitan.git
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f4f4caab0e
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
50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
#ifndef COSMOPOLITAN_TOOL_BUILD_LIB_COND_H_
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#define COSMOPOLITAN_TOOL_BUILD_LIB_COND_H_
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#include "tool/build/lib/flags.h"
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#include "tool/build/lib/machine.h"
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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forceinline bool GetCond(struct Machine *m, int x) {
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uint32_t f = m->flags;
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switch (x) {
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case 0:
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return GetFlag(f, FLAGS_OF);
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case 1:
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return !GetFlag(f, FLAGS_OF);
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case 2:
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return GetFlag(f, FLAGS_CF);
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case 3:
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return !GetFlag(f, FLAGS_CF);
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case 4:
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return GetFlag(f, FLAGS_ZF);
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case 5:
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return !GetFlag(f, FLAGS_ZF);
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case 6:
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return GetFlag(f, FLAGS_CF) || GetFlag(f, FLAGS_ZF);
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case 7:
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return !GetFlag(f, FLAGS_CF) && !GetFlag(f, FLAGS_ZF);
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case 8:
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return GetFlag(f, FLAGS_SF);
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case 9:
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return !GetFlag(f, FLAGS_SF);
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case 10:
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return GetFlag(f, FLAGS_PF);
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case 11:
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return !GetFlag(f, FLAGS_PF);
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case 12:
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return GetFlag(f, FLAGS_SF) != GetFlag(f, FLAGS_OF);
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case 13:
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return GetFlag(f, FLAGS_SF) == GetFlag(f, FLAGS_OF);
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case 14:
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return GetFlag(f, FLAGS_ZF) ||
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GetFlag(f, FLAGS_SF) != GetFlag(f, FLAGS_OF);
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case 15:
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return !GetFlag(f, FLAGS_ZF) &&
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GetFlag(f, FLAGS_SF) == GetFlag(f, FLAGS_OF);
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default:
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unreachable;
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}
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}
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_TOOL_BUILD_LIB_COND_H_ */
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