package runtime

import (
	"runtime/internal/sys"
	"unsafe"
)

func dumpregs(c *sigctxt) {
	print("rax    ", hex(c.rax()), "\n")
	print("rbx    ", hex(c.rbx()), "\n")
	print("rcx    ", hex(c.rcx()), "\n")
	print("rdx    ", hex(c.rdx()), "\n")
	print("rdi    ", hex(c.rdi()), "\n")
	print("rsi    ", hex(c.rsi()), "\n")
	print("rbp    ", hex(c.rbp()), "\n")
	print("rsp    ", hex(c.rsp()), "\n")
	print("r8     ", hex(c.r8()), "\n")
	print("r9     ", hex(c.r9()), "\n")
	print("r10    ", hex(c.r10()), "\n")
	print("r11    ", hex(c.r11()), "\n")
	print("r12    ", hex(c.r12()), "\n")
	print("r13    ", hex(c.r13()), "\n")
	print("r14    ", hex(c.r14()), "\n")
	print("r15    ", hex(c.r15()), "\n")
	print("rip    ", hex(c.rip()), "\n")
	print("rflags ", hex(c.rflags()), "\n")
	print("cs     ", hex(c.cs()), "\n")
	print("fs     ", hex(c.fs()), "\n")
	print("gs     ", hex(c.gs()), "\n")
}

func (c *sigctxt) sigpc() uintptr { return uintptr(c.rip()) }

func (c *sigctxt) sigsp() uintptr { return uintptr(c.rsp()) }
func (c *sigctxt) siglr() uintptr { return 0 }
func (c *sigctxt) fault() uintptr { return uintptr(c.sigaddr()) }

	if GOOS == "darwin" && sig == _SIGFPE && gp.sigcode0 == 0 {
		pc := (*[4]byte)(unsafe.Pointer(gp.sigpc))
		i := 0
		if pc[i]&0xF0 == 0x40 { // 64-bit REX prefix
			i++
		} else if pc[i] == 0x66 { // 16-bit instruction prefix
			i++
		}
		if pc[i] == 0xF6 || pc[i] == 0xF7 {
			gp.sigcode0 = _FPE_INTDIV
		}
	}

	pc := uintptr(c.rip())
	sp := uintptr(c.rsp())

	if shouldPushSigpanic(gp, pc, *(*uintptr)(unsafe.Pointer(sp))) {
		c.pushCall(funcPC(sigpanic), pc)

		c.set_rip(uint64(funcPC(sigpanic)))
	}
}

	sp := uintptr(c.rsp())
	sp -= sys.PtrSize
	*(*uintptr)(unsafe.Pointer(sp)) = resumePC
	c.set_rsp(uint64(sp))
	c.set_rip(uint64(targetPC))