62 lines
2.9 KiB
C
62 lines
2.9 KiB
C
#ifndef COSMOPOLITAN_LIBC_LOG_GDB_H_
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#define COSMOPOLITAN_LIBC_LOG_GDB_H_
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#include "libc/calls/calls.h"
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#include "libc/calls/wait4.h"
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#include "libc/sysv/consts/nr.h"
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#include "libc/sysv/consts/w.h"
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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/**
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* @fileoverview GDB Attach Support Code.
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*
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* The goal of these macros is to make the backtrace into the failing
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* code as short as possible. It also helps avoid GDB getting confused
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* about how we don't use its readability destroying unwind directives.
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*/
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extern volatile int g_gdbsync;
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int gdbexec(const char *);
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int attachdebugger(intptr_t);
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#define attachdebugger(CONTINUE_TO_ADDR) /* shorten backtraces */ \
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SYNCHRONIZE_DEBUGGER((attachdebugger)(CONTINUE_TO_ADDR))
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#define SYNCHRONIZE_DEBUGGER(PID) \
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({ \
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int Rc, Pid = (PID); \
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if (Pid != -1) { \
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while ((Rc = __inline_wait4(Pid, NULL, WNOHANG, NULL)) == 0) { \
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if (g_gdbsync) { \
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g_gdbsync = 0; \
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if (Rc > 0) Pid = 0; \
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break; \
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} else { \
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sched_yield(); \
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} \
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} \
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} \
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Pid; \
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})
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#define __inline_wait4(PID, OPT_OUT_WSTATUS, OPTIONS, OPT_OUT_RUSAGE) \
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({ \
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int64_t WaAx; \
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if (!IsWindows()) { \
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asm volatile("mov\t%5,%%r10\n\t" \
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"syscall" \
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: "=a"(WaAx) \
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: "0"(__NR_wait4), "D"(PID), "S"(OPT_OUT_WSTATUS), \
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"d"(OPTIONS), "g"(OPT_OUT_RUSAGE) \
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: "rcx", "r10", "r11", "cc", "memory"); \
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} else { \
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WaAx = wait4$nt(PID, OPT_OUT_WSTATUS, OPTIONS, OPT_OUT_RUSAGE); \
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} \
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WaAx; \
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})
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_LOG_GDB_H_ */
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