feat(asm): encode indirect JMP and CALL on all four architectures

Assisted-by: GLM 5.3 Flash

verify/abi_loong64.s

@@ -39,7 +39,7 @@ TEXT ·enterJITChecked(SB), NOSPLIT, $0-16
 	MOVV 0(R5), R1 // load leaveJITCheckedRaw into RA
 	MOVV R5, R3 // SP stays on the leave slot: the kernel
 	// reads its first argument at SP+8
-	JIRL R0, R4, 0 // jump to JIT function
+	JMP  (R4) // jump to JIT function
 
 	// leaveJITCheckedRaw is the raw return trampoline.  It has NO Go function
 	// declaration, so no ABIInternal wrapper is generated; the JIT function's
@@ -61,6 +61,6 @@ g_ok:
 	MOVV savedRA(SB), R1 // restore return address
 	MOVV savedG(SB), g // restore g: Go code needs it the moment it
 	// resumes, violation or not
-	JIRL R0, R1, 0 // return to Go caller
+	JMP  (R1) // return to Go caller
 
 GLOBL savedG(SB), NOPTR, $8

verify/arm64_groundtruth_test.go

@@ -25,6 +25,7 @@ func TestGroundTruthARM64(t *testing.T) {
 		"../testdata/verify/call_arm64.s",
 		"../testdata/verify/bigframe_arm64.s",
 		"../testdata/verify/guard_arm64.s",
+		"../testdata/verify/indirect_arm64.s",
 	} {
 		t.Run(path, func(t *testing.T) {
 			src, err := os.ReadFile(path)

verify/groundtruth_test.go

@@ -98,6 +98,7 @@ func TestGroundTruthAMD64(t *testing.T) {
 		"../testdata/verify/basic_amd64.s",
 		"../testdata/verify/bigframe_amd64.s",
 		"../testdata/verify/guard_amd64.s",
+		"../testdata/verify/indirect_amd64.s",
 	} {
 		t.Run(path, func(t *testing.T) {
 			f, errs := parser.Parse(path, mustRead(t, path))

verify/l64_groundtruth_test.go

@@ -24,6 +24,8 @@ func TestGroundTruthLOONG64(t *testing.T) {
 		"../testdata/verify/fp_loong64.s",
 		"../testdata/verify/bigframe_loong64.s",
 		"../testdata/verify/guard_loong64.s",
+		"../testdata/verify/indirect_loong64.s",
+		"trampoline_loong64.s",
 	} {
 		t.Run(path, func(t *testing.T) {
 			src, err := os.ReadFile(path)

verify/riscv_groundtruth_test.go

@@ -27,6 +27,8 @@ func TestGroundTruthRISCV(t *testing.T) {
 		"../testdata/verify/call_riscv64.s",
 		"../testdata/verify/bigframe_riscv64.s",
 		"../testdata/verify/guard_riscv64.s",
+		"../testdata/verify/indirect_riscv64.s",
+		"trampoline_riscv64.s",
 	} {
 		t.Run(path, func(t *testing.T) {
 			testGroundTruthRISCVFile(t, path)

verify/trampoline_loong64.s

@@ -6,7 +6,7 @@
 // ABI0 JIT trampoline for LoongArch 64.
 //
 // enterJIT saves Go SP and RA (R1), switches to the prepared stack, and
-// jumps to the JIT function.  When the function RETs (JIRL zero, ra, 0),
+// jumps to the JIT function.  When the function RETs (JMP (R1), the toolchain's spelling for jirl zero, ra, 0),
 // control lands in leaveJIT.
 
 // func enterJIT(fn uintptr, stack uintptr)
@@ -19,14 +19,14 @@ TEXT ·enterJIT(SB), NOSPLIT, $0-16
 	MOVV R5, R3 // switch to the prepared stack: SP stays on
 	// the leave slot, so the kernel reads its
 	// first argument at SP+8
-	JIRL R0, R4, 0 // jump to JIT function
+	JMP  (R4) // jump to JIT function
 
 	// func leaveJIT()
 TEXT ·leaveJIT(SB), NOSPLIT, $0-0
 	MOVV savedSP(SB), R5 // restore Go stack pointer
 	MOVV R5, R3 // restore SP
 	MOVV savedRA(SB), R1 // restore return address
-	JIRL R0, R1, 0 // return to Go caller
+	JMP  (R1) // return to Go caller
 
 GLOBL savedRA(SB), NOPTR, $8