cosmopolitan/libc/runtime/stack.h
Justine Tunney 9208c83f7a Make some systemic improvements
- add vdso dump utility
- tests now log stack usage
- rename g_ftrace to __ftrace
- make internal spinlocks go faster
- add conformant c11 atomics library
- function tracing now logs stack usage
- make function call tracing thread safe
- add -X unsecure (no ssl) mode to redbean
- munmap() has more consistent behavior now
- pacify fsync() calls on python unit tests
- make --strace flag work better in redbean
- start minimizing and documenting compiler flags
2022-05-18 16:52:36 -07:00

88 lines
2.8 KiB
C

#ifndef COSMOPOLITAN_LIBC_RUNTIME_STACK_H_
#define COSMOPOLITAN_LIBC_RUNTIME_STACK_H_
#include "ape/config.h"
#include "libc/dce.h"
#include "libc/nt/version.h"
#include "libc/runtime/runtime.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
/**
* Tunes APE stack maximum size.
*
* This defaults to `STACKSIZE`. The bottom-most page will be protected
* to ensure your stack does not magically grow beyond this value. It's
* possible to detect stack overflows, by calling `ShowCrashReports()`.
*
* If you want to know how much stack your programs needs, then
*
* STATIC_YOINK("stack_usage_logging");
*
* will install an atexit() handler that appends to `o/$MODE/stack.log`
*
* @see libc/sysv/systemfive.S
* @see ape/ape.lds
*/
#define STATIC_STACK_SIZE(BYTES) \
STATIC_SYMBOL("ape_stack_memsz", _STACK_STRINGIFY(BYTES) _STACK_EXTRA)
/**
* Tunes APE stack virtual address.
*
* This defaults to `0x7e0000000000 - STACKSIZE`. The value defined by
* this macro will be respected, with two exceptions: (1) in MODE=tiny
* the operating system provided stack is used instead and (2) Windows
* Seven doesn't support 64-bit addresses so 0x10000000 - GetStackSize
* is used instead.
*
* @see libc/sysv/systemfive.S
* @see libc/nt/winmain.greg.c
* @see ape/ape.lds
*/
#define STATIC_STACK_ADDR(ADDR) \
STATIC_SYMBOL("ape_stack_vaddr", _STACK_STRINGIFY(ADDR))
#define _STACK_STRINGIFY(ADDR) #ADDR
#if IsAsan()
#define _STACK_EXTRA "*2"
#else
#define _STACK_EXTRA ""
#endif
#if defined(__GNUC__) && defined(__ELF__) && !defined(__STRICT_ANSI__)
COSMOPOLITAN_C_START_
extern char ape_stack_prot[] __attribute__((__weak__));
extern char ape_stack_memsz[] __attribute__((__weak__));
extern char ape_stack_align[] __attribute__((__weak__));
#define GetStackSize() ((uintptr_t)ape_stack_memsz)
/**
* Returns address of bottom of stack.
*/
#define GetStackAddr(ADDEND) \
((void *)((((intptr_t)__builtin_frame_address(0) - 1) & -GetStackSize()) + \
(ADDEND)))
/**
* Returns preferred bottom address of stack.
*/
#define GetStaticStackAddr(ADDEND) \
({ \
intptr_t vAddr; \
if (!IsWindows() || IsAtLeastWindows10()) { \
__asm__(".weak\tape_stack_vaddr\n\t" \
"movabs\t%1+ape_stack_vaddr,%0" \
: "=r"(vAddr) \
: "i"(ADDEND)); \
} else { \
vAddr = 0x10000000; \
} \
(void *)vAddr; \
})
COSMOPOLITAN_C_END_
#endif /* GNU ELF */
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_RUNTIME_STACK_H_ */