Exemplo n.º 1
0
/*
 * generate:
 *	call f
 *	proc=-1	normal call but no return
 *	proc=0	normal call
 *	proc=1	goroutine run in new proc
 *	proc=2	defer call save away stack
  *	proc=3	normal call to C pointer (not Go func value)
*/
func ginscall(f *gc.Node, proc int) {
	if f.Type != nil {
		extra := int32(0)
		if proc == 1 || proc == 2 {
			extra = 2 * int32(gc.Widthptr)
		}
		gc.Setmaxarg(f.Type, extra)
	}

	switch proc {
	default:
		gc.Fatal("ginscall: bad proc %d", proc)

	case 0, // normal call
		-1: // normal call but no return
		if f.Op == gc.ONAME && f.Class == gc.PFUNC {
			if f == gc.Deferreturn {
				// Deferred calls will appear to be returning to
				// the CALL deferreturn(SB) that we are about to emit.
				// However, the stack trace code will show the line
				// of the instruction byte before the return PC.
				// To avoid that being an unrelated instruction,
				// insert a ppc64 NOP that we will have the right line number.
				// The ppc64 NOP is really or r0, r0, r0; use that description
				// because the NOP pseudo-instruction would be removed by
				// the linker.
				var reg gc.Node
				gc.Nodreg(&reg, gc.Types[gc.TINT], ppc64.REG_R0)

				gins(ppc64.AOR, &reg, &reg)
			}

			p := gins(ppc64.ABL, nil, f)
			gc.Afunclit(&p.To, f)
			if proc == -1 || gc.Noreturn(p) {
				gins(obj.AUNDEF, nil, nil)
			}
			break
		}

		var reg gc.Node
		gc.Nodreg(&reg, gc.Types[gc.Tptr], ppc64.REGCTXT)
		var r1 gc.Node
		gc.Nodreg(&r1, gc.Types[gc.Tptr], ppc64.REG_R3)
		gmove(f, &reg)
		reg.Op = gc.OINDREG
		gmove(&reg, &r1)
		reg.Op = gc.OREGISTER
		ginsBL(&reg, &r1)

	case 3: // normal call of c function pointer
		ginsBL(nil, f)

	case 1, // call in new proc (go)
		2: // deferred call (defer)
		var con gc.Node
		gc.Nodconst(&con, gc.Types[gc.TINT64], int64(gc.Argsize(f.Type)))

		var reg gc.Node
		gc.Nodreg(&reg, gc.Types[gc.TINT64], ppc64.REG_R3)
		var reg2 gc.Node
		gc.Nodreg(&reg2, gc.Types[gc.TINT64], ppc64.REG_R4)
		gmove(f, &reg)

		gmove(&con, &reg2)
		p := gins(ppc64.AMOVW, &reg2, nil)
		p.To.Type = obj.TYPE_MEM
		p.To.Reg = ppc64.REGSP
		p.To.Offset = 8

		p = gins(ppc64.AMOVD, &reg, nil)
		p.To.Type = obj.TYPE_MEM
		p.To.Reg = ppc64.REGSP
		p.To.Offset = 16

		if proc == 1 {
			ginscall(gc.Newproc, 0)
		} else {
			if gc.Hasdefer == 0 {
				gc.Fatal("hasdefer=0 but has defer")
			}
			ginscall(gc.Deferproc, 0)
		}

		if proc == 2 {
			gc.Nodreg(&reg, gc.Types[gc.TINT64], ppc64.REG_R3)
			p := gins(ppc64.ACMP, &reg, nil)
			p.To.Type = obj.TYPE_REG
			p.To.Reg = ppc64.REGZERO
			p = gc.Gbranch(ppc64.ABEQ, nil, +1)
			cgen_ret(nil)
			gc.Patch(p, gc.Pc)
		}
	}
}
Exemplo n.º 2
0
/*
 * generate:
 *	call f
 *	proc=-1	normal call but no return
 *	proc=0	normal call
 *	proc=1	goroutine run in new proc
 *	proc=2	defer call save away stack
  *	proc=3	normal call to C pointer (not Go func value)
*/
func ginscall(f *gc.Node, proc int) {
	if f.Type != nil {
		extra := int32(0)
		if proc == 1 || proc == 2 {
			extra = 2 * int32(gc.Widthptr)
		}
		gc.Setmaxarg(f.Type, extra)
	}

	switch proc {
	default:
		gc.Fatal("ginscall: bad proc %d", proc)

	case 0, // normal call
		-1: // normal call but no return
		if f.Op == gc.ONAME && f.Class == gc.PFUNC {
			if f == gc.Deferreturn {
				// Deferred calls will appear to be returning to
				// the CALL deferreturn(SB) that we are about to emit.
				// However, the stack trace code will show the line
				// of the instruction byte before the return PC.
				// To avoid that being an unrelated instruction,
				// insert an x86 NOP that we will have the right line number.
				// x86 NOP 0x90 is really XCHG AX, AX; use that description
				// because the NOP pseudo-instruction will be removed by
				// the linker.
				var reg gc.Node
				gc.Nodreg(&reg, gc.Types[gc.TINT], x86.REG_AX)

				gins(x86.AXCHGL, &reg, &reg)
			}

			p := gins(obj.ACALL, nil, f)
			gc.Afunclit(&p.To, f)
			if proc == -1 || gc.Noreturn(p) {
				gins(obj.AUNDEF, nil, nil)
			}
			break
		}

		var reg gc.Node
		gc.Nodreg(&reg, gc.Types[gc.Tptr], x86.REG_DX)
		var r1 gc.Node
		gc.Nodreg(&r1, gc.Types[gc.Tptr], x86.REG_BX)
		gmove(f, &reg)
		reg.Op = gc.OINDREG
		gmove(&reg, &r1)
		reg.Op = gc.OREGISTER
		gins(obj.ACALL, &reg, &r1)

	case 3: // normal call of c function pointer
		gins(obj.ACALL, nil, f)

	case 1, // call in new proc (go)
		2: // deferred call (defer)
		var stk gc.Node

		stk.Op = gc.OINDREG
		stk.Val.U.Reg = x86.REG_SP
		stk.Xoffset = 0

		// size of arguments at 0(SP)
		var con gc.Node
		gc.Nodconst(&con, gc.Types[gc.TINT32], int64(gc.Argsize(f.Type)))

		gins(x86.AMOVL, &con, &stk)

		// FuncVal* at 4(SP)
		stk.Xoffset = int64(gc.Widthptr)

		gins(x86.AMOVL, f, &stk)

		if proc == 1 {
			ginscall(gc.Newproc, 0)
		} else {
			ginscall(gc.Deferproc, 0)
		}
		if proc == 2 {
			var reg gc.Node
			gc.Nodreg(&reg, gc.Types[gc.TINT32], x86.REG_AX)
			gins(x86.ATESTL, &reg, &reg)
			p := gc.Gbranch(x86.AJEQ, nil, +1)
			cgen_ret(nil)
			gc.Patch(p, gc.Pc)
		}
	}
}
Exemplo n.º 3
0
/*
 * generate:
 *	call f
 *	proc=-1	normal call but no return
 *	proc=0	normal call
 *	proc=1	goroutine run in new proc
 *	proc=2	defer call save away stack
  *	proc=3	normal call to C pointer (not Go func value)
*/
func ginscall(f *gc.Node, proc int) {
	if f.Type != nil {
		extra := int32(0)
		if proc == 1 || proc == 2 {
			extra = 2 * int32(gc.Widthptr)
		}
		gc.Setmaxarg(f.Type, extra)
	}

	switch proc {
	default:
		gc.Fatal("ginscall: bad proc %d", proc)

	case 0, // normal call
		-1: // normal call but no return
		if f.Op == gc.ONAME && f.Class == gc.PFUNC {
			if f == gc.Deferreturn {
				// Deferred calls will appear to be returning to
				// the BL deferreturn(SB) that we are about to emit.
				// However, the stack trace code will show the line
				// of the instruction before that return PC.
				// To avoid that instruction being an unrelated instruction,
				// insert a NOP so that we will have the right line number.
				// ARM NOP 0x00000000 is really AND.EQ R0, R0, R0.
				// Use the latter form because the NOP pseudo-instruction
				// would be removed by the linker.
				var r gc.Node
				gc.Nodreg(&r, gc.Types[gc.TINT], arm.REG_R0)

				p := gins(arm.AAND, &r, &r)
				p.Scond = arm.C_SCOND_EQ
			}

			p := gins(arm.ABL, nil, f)
			gc.Afunclit(&p.To, f)
			if proc == -1 || gc.Noreturn(p) {
				gins(obj.AUNDEF, nil, nil)
			}
			break
		}

		var r gc.Node
		gc.Nodreg(&r, gc.Types[gc.Tptr], arm.REG_R7)
		var r1 gc.Node
		gc.Nodreg(&r1, gc.Types[gc.Tptr], arm.REG_R1)
		gmove(f, &r)
		r.Op = gc.OINDREG
		gmove(&r, &r1)
		r.Op = gc.OREGISTER
		r1.Op = gc.OINDREG
		gins(arm.ABL, &r, &r1)

	case 3: // normal call of c function pointer
		gins(arm.ABL, nil, f)

	case 1, // call in new proc (go)
		2: // deferred call (defer)
		var r gc.Node
		regalloc(&r, gc.Types[gc.Tptr], nil)

		var con gc.Node
		gc.Nodconst(&con, gc.Types[gc.TINT32], int64(gc.Argsize(f.Type)))
		gins(arm.AMOVW, &con, &r)
		p := gins(arm.AMOVW, &r, nil)
		p.To.Type = obj.TYPE_MEM
		p.To.Reg = arm.REGSP
		p.To.Offset = 4

		gins(arm.AMOVW, f, &r)
		p = gins(arm.AMOVW, &r, nil)
		p.To.Type = obj.TYPE_MEM
		p.To.Reg = arm.REGSP
		p.To.Offset = 8

		regfree(&r)

		if proc == 1 {
			ginscall(gc.Newproc, 0)
		} else {
			ginscall(gc.Deferproc, 0)
		}

		if proc == 2 {
			gc.Nodconst(&con, gc.Types[gc.TINT32], 0)
			p := gins(arm.ACMP, &con, nil)
			p.Reg = arm.REG_R0
			p = gc.Gbranch(arm.ABEQ, nil, +1)
			cgen_ret(nil)
			gc.Patch(p, gc.Pc)
		}
	}
}