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edd9297eba
Your Actually Portable Executables now contains a simple virtual memory that works similarly to the Linux Kernel in the sense that it maps your physical memory to negative addresses. This is needed to support mmap() and malloc(). This functionality has zero code size impact. For example the MODE=tiny LIFE.COM executable is still only 12KB in size. The APE bootloader code has also been simplified to improve readibility and further elevate the elegance by which we're able to support so many platforms thereby enhancing verifiability so that we may engender trust in this bootloading process.
112 lines
3.3 KiB
C
112 lines
3.3 KiB
C
#ifndef COSMOPOLITAN_LIBC_DCE_H_
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#define COSMOPOLITAN_LIBC_DCE_H_
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#include "libc/nexgen32e/kcpuids.h"
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/*─────────────────────────────────────────────────────────────────────────────╗
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│ cosmopolitan § autotune » dead code elimination │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#ifndef SUPPORT_VECTOR
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/**
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* Supported Platforms Tuning Knob (Runtime & Compile-Time)
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* Tuning this bitmask will remove platform polyfills at compile-time.
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*/
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#define SUPPORT_VECTOR 255
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#endif
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#define LINUX 1
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#define METAL 2
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#define WINDOWS 4
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#define XNU 8
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#define OPENBSD 16
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#define FREEBSD 32
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#define NETBSD 64
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#ifdef NDEBUG
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#define NoDebug() 1
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#else
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#define NoDebug() 0
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#endif
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#ifdef MODE_DBG
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#define IsModeDbg() 1
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#else
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#define IsModeDbg() 0
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#endif
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#ifdef __MFENTRY__
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#define HaveFentry() 1
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#else
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#define HaveFentry() 0
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#endif
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#ifdef TRUSTWORTHY
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#define IsTrustworthy() 1
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#else
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#define IsTrustworthy() 0
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#endif
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#ifdef SECURITY_BLANKETS
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#define UseSecurityBlankets() 1
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#else
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#define UseSecurityBlankets() 0
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#endif
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#ifdef TINY
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#define IsTiny() 1
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#else
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#define IsTiny() 0
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#endif
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#ifdef __OPTIMIZE__
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#define IsOptimized() 1
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#else
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#define IsOptimized() 0
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#endif
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#if defined(__PIE__) || defined(__PIC__)
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#define IsPositionIndependent() 1
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#else
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#define IsPositionIndependent() 0
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#endif
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#define SupportsLinux() ((SUPPORT_VECTOR & LINUX) == LINUX)
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#define SupportsMetal() ((SUPPORT_VECTOR & METAL) == METAL)
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#define SupportsWindows() ((SUPPORT_VECTOR & WINDOWS) == WINDOWS)
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#define SupportsXnu() ((SUPPORT_VECTOR & XNU) == XNU)
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#define SupportsFreebsd() ((SUPPORT_VECTOR & FREEBSD) == FREEBSD)
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#define SupportsOpenbsd() ((SUPPORT_VECTOR & OPENBSD) == OPENBSD)
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#define SupportsNetbsd() ((SUPPORT_VECTOR & NETBSD) == NETBSD)
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#define SupportsBsd() (!!(SUPPORT_VECTOR & (XNU | FREEBSD | OPENBSD | NETBSD)))
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#define SupportsSystemv() \
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(!!(SUPPORT_VECTOR & (LINUX | XNU | OPENBSD | FREEBSD | NETBSD)))
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#ifndef __ASSEMBLER__
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#define IsLinux() (SupportsLinux() && (__hostos & LINUX))
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#define IsMetal() (SupportsMetal() && (__hostos & METAL))
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#define IsWindows() (SupportsWindows() && (__hostos & WINDOWS))
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#define IsXnu() (SupportsXnu() && (__hostos & XNU))
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#define IsFreebsd() (SupportsFreebsd() && (__hostos & FREEBSD))
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#define IsOpenbsd() (SupportsOpenbsd() && (__hostos & OPENBSD))
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#define IsNetbsd() (SupportsNetbsd() && (__hostos & NETBSD))
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#define IsBsd() (IsXnu() || IsFreebsd() || IsOpenbsd() || IsNetbsd())
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#else
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/* clang-format off */
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#define IsLinux() $LINUX,__hostos(%rip)
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#define IsMetal() $METAL,__hostos(%rip)
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#define IsWindows() $WINDOWS,__hostos(%rip)
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#define IsBsd() $XNU|FREEBSD|OPENBSD|NETBSD,__hostos(%rip)
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#define IsXnu() $XNU,__hostos(%rip)
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#define IsFreebsd() $FREEBSD,__hostos(%rip)
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#define IsOpenbsd() $OPENBSD,__hostos(%rip)
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#define IsNetbsd() $NETBSD,__hostos(%rip)
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/* clang-format on */
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#endif
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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extern const int __hostos;
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_DCE_H_ */
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