jmpbuf.h

#ifndef _JMPBUF_H
#define _JMPBUF_H

#include <stddef.h>

#include "debug.h"

#define JMPBUF_SIZE 5
typedef void *jmpbuf[JMPBUF_SIZE];

#define JMPBUF_FP(ctx) (ctx)[0] // frame addr, i.e., %rbp
#define JMPBUF_PC(ctx) (ctx)[1] // PC counter, i.e., %rip
#define JMPBUF_SP(ctx) (ctx)[2] // stack addr, i.e., %rsp

/**
 * @brief Get frame pointer from jump buffer in__cilkrts_stack_frame.
 */
#define FP(SF) JMPBUF_FP((SF)->ctx)

/**
 * @brief Get program counter from jump buffer in__cilkrts_stack_frame.
 */
#define PC(SF) JMPBUF_PC((SF)->ctx)

/**
 * @brief Get stack pointer from jump buffer in__cilkrts_stack_frame.
 */
#define SP(SF) JMPBUF_SP((SF)->ctx)

#if defined __i386__ || defined __x86_64__
// We use an otherwise unused entry in the jmpbuf to store MXCSR
#define JMPBUF_MXCSR(ctx) (ctx)[3]
/**
 * @brief Get MXCSR from jump buffer in__cilkrts_stack_frame.  X86 and X86_64
 * only.
 */
#define MXCSR(SF) JMPBUF_MXCSR((SF)->ctx)
#endif

#if defined __i386__
#define ASM_GET_SP(osp) __asm__ volatile("movl %%esp, %0" : "=r"(osp))
#elif defined __x86_64__
#define ASM_GET_SP(osp) __asm__ volatile("movq %%rsp, %0" : "=r"(osp))
#elif defined __aarch64__
#define ASM_GET_SP(osp) __asm__ volatile("mov %0, sp" : "=r"(osp))
#else
#error "No defined method to get stack pointer on this architecture."
#endif

/* These macros are only for debugging. */
#define ASM_GET_FP(ofp) (ofp) = __builtin_frame_address(0)

#define DUMP_STACK(lvl, w)                                                     \
    {                                                                          \
        char *x_bp;                                                            \
        char *x_sp;                                                            \
        ASM_GET_FP(x_bp);                                                      \
        ASM_GET_SP(x_sp);                                                      \
        cilkrts_alert((lvl), "rbp %p rsp %p", x_bp, x_sp);                \
    }
#endif