LEAL	4(SP), DI
	CLD
	MOVSL				// arg 1 - sig
	MOVSL				// arg 2 - act
	MOVSL				// arg 3 - oact
	LEAL	sigreturn_tramp<>(SB), AX
	STOSL				// arg 4 - tramp
	MOVL	$2, AX
	STOSL				// arg 5 - vers
	MOVL	$SYS___sigaction_sigtramp, AX
	INT	$0x80
	JAE	2(PC)
	MOVL	$0xf1, 0xf1		// crash
	RET

TEXT runtime·sigfwd(SB),NOSPLIT,$12-16
	MOVL	fn+0(FP), AX
	MOVL	sig+4(FP), BX
	MOVL	info+8(FP), CX

	MOVW	sig+0(FP), R0		// arg 1 - signum
	MOVD	new+8(FP), R1		// arg 2 - nsa
	MOVD	old+16(FP), R2		// arg 3 - osa
					// arg 4 - tramp
	MOVD	$sigreturn_tramp<>(SB), R3
	MOVW	$2, R4			// arg 5 - vers
	SVC	$SYS___sigaction_sigtramp
	BCS	fail
	RET
fail:
	MOVD	$0, R0
	MOVD	R0, (R0)		// crash

// XXX ???
TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
	MOVW	sig+8(FP), R0
	MOVD	info+16(FP), R1

		}
	}
	return &parser{data: buf, ver: ver, timerGoids: make(map[uint64]bool)}, nil
}

// Parse parses Go execution traces from versions 1.11–1.21. The provided reader
// will be read to completion and the entire trace will be materialized in
// memory. That is, this function does not allow incremental parsing.
//
// The reader has to be positioned just after the trace header and vers needs to

	for k, s := range s.Scopes {
		var pruned Scope = Scope{Parent: s.Parent, Ranges: s.Ranges}
		for i := 0; i < len(s.Vars); i++ {
			_, found := pvars[s.Vars[i]]
			if !found {
				pruned.Vars = append(pruned.Vars, s.Vars[i])
			}
		}
		sort.Sort(byChildIndex(pruned.Vars))
		scopes[k] = pruned
	}

	s.dictIndexToOffset = putparamtypes(ctxt, s, scopes, fnabbrev)

	var encbuf [20]byte

	SYS___SIGACTION_SIGTRAMP = 340 // { int|sys||__sigaction_sigtramp(int signum, const struct sigaction *nsa, struct sigaction *osa, const void *tramp, int vers); }
	SYS_PMC_GET_INFO         = 341 // { int|sys||pmc_get_info(int ctr, int op, void *args); }
	SYS_PMC_CONTROL          = 342 // { int|sys||pmc_control(int ctr, int op, void *args); }

	SYS___SIGACTION_SIGTRAMP = 340 // { int|sys||__sigaction_sigtramp(int signum, const struct sigaction *nsa, struct sigaction *osa, const void *tramp, int vers); }
	SYS_PMC_GET_INFO         = 341 // { int|sys||pmc_get_info(int ctr, int op, void *args); }
	SYS_PMC_CONTROL          = 342 // { int|sys||pmc_control(int ctr, int op, void *args); }

	SYS___SIGACTION_SIGTRAMP = 340 // { int|sys||__sigaction_sigtramp(int signum, const struct sigaction *nsa, struct sigaction *osa, const void *tramp, int vers); }
	SYS_PMC_GET_INFO         = 341 // { int|sys||pmc_get_info(int ctr, int op, void *args); }
	SYS_PMC_CONTROL          = 342 // { int|sys||pmc_control(int ctr, int op, void *args); }

	SYS___SIGACTION_SIGTRAMP = 340 // { int|sys||__sigaction_sigtramp(int signum, const struct sigaction *nsa, struct sigaction *osa, const void *tramp, int vers); }
	SYS_PMC_GET_INFO         = 341 // { int|sys||pmc_get_info(int ctr, int op, void *args); }
	SYS_PMC_CONTROL          = 342 // { int|sys||pmc_control(int ctr, int op, void *args); }

	SYS___SIGACTION_SIGTRAMP = 340 // { int|sys||__sigaction_sigtramp(int signum, const struct sigaction *nsa, struct sigaction *osa, const void *tramp, int vers); }
	SYS_PMC_GET_INFO         = 341 // { int|sys||pmc_get_info(int ctr, int op, void *args); }
	SYS_PMC_CONTROL          = 342 // { int|sys||pmc_control(int ctr, int op, void *args); }

	SYS___SIGACTION_SIGTRAMP = 340 // { int|sys||__sigaction_sigtramp(int signum, const struct sigaction *nsa, struct sigaction *osa, const void *tramp, int vers); }
	SYS_PMC_GET_INFO         = 341 // { int|sys||pmc_get_info(int ctr, int op, void *args); }
	SYS_PMC_CONTROL          = 342 // { int|sys||pmc_control(int ctr, int op, void *args); }