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80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
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#ifndef COSMOPOLITAN_LIBC_RUNTIME_STACK_H_
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#define COSMOPOLITAN_LIBC_RUNTIME_STACK_H_
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#include "ape/config.h"
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#include "libc/dce.h"
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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/**
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* Tunes APE stack maximum size.
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*
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* This defaults to `STACKSIZE`. The bottom-most page will be protected
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* to ensure your stack does not magically grow beyond this value. It's
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* possible to detect stack overflows, by calling `ShowCrashReports()`.
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*
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* If you want to know how much stack your programs needs, then
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*
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* STATIC_YOINK("stack_usage_logging");
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*
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* will install an atexit() handler that appends to `o/$MODE/stack.log`
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*
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* @see libc/sysv/systemfive.S
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* @see ape/ape.lds
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*/
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#define STATIC_STACK_SIZE(BYTES) \
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STATIC_SYMBOL("ape_stack_memsz", _STACK_STRINGIFY(BYTES) _STACK_EXTRA)
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/**
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* Tunes APE stack virtual address.
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*
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* This defaults to `0x700000000000 - STACKSIZE`. The value defined by
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* this macro will be respected, with two exceptions: (1) in MODE=tiny
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* the operating system provided stack is used instead and (2) Windows
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* Seven doesn't support 64-bit addresses so 0x10000000 - GetStackSize
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* is used instead.
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*
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* @see libc/sysv/systemfive.S
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* @see libc/nt/winmain.greg.c
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* @see ape/ape.lds
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*/
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#define STATIC_STACK_ADDR(ADDR) \
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STATIC_SYMBOL("ape_stack_vaddr", _STACK_STRINGIFY(ADDR))
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#define _STACK_STRINGIFY(ADDR) #ADDR
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#if IsAsan()
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#define _STACK_EXTRA "*2"
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#else
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#define _STACK_EXTRA ""
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#endif
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#if defined(__GNUC__) && defined(__ELF__)
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COSMOPOLITAN_C_START_
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extern char ape_stack_memsz[] __attribute__((__weak__));
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#define GetStackSize() ((uintptr_t)ape_stack_memsz)
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/**
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* Returns address of bottom of stack.
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*/
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#define GetStackAddr(ADDEND) \
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(((intptr_t)__builtin_frame_address(0) & -GetStackSize()) + (ADDEND))
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/**
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* Returns preferred bottom address of stack.
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*/
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#define GetStaticStackAddr(ADDEND) \
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({ \
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intptr_t vAddr = 0; \
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asm(".weak\tape_stack_vaddr\n\t" \
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"movabs\t%1+ape_stack_vaddr,%0" \
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: "=r"(vAddr) \
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: "i"(ADDEND)); \
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vAddr; \
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})
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COSMOPOLITAN_C_END_
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#endif /* GNU ELF */
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_RUNTIME_STACK_H_ */
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