interceptor: Fix ARMv8 BTI interoperability

zjw88282740 · oleavr · commit ea1e836e70cd · 2023-04-18T00:48:27.000+02:00
Use `RET X16` instead of `BR X16` to satisfy BTI.
diff --git a/gum/backend-arm64/guminterceptor-arm64.c b/gum/backend-arm64/guminterceptor-arm64.c
@@ -1145,5 +1145,5 @@ gum_emit_epilog (GumArm64Writer * aw)
     gum_arm64_writer_put_pop_reg_reg (aw, ARM64_REG_Q0 + i, ARM64_REG_Q1 + i);
 
   gum_arm64_writer_put_pop_reg_reg (aw, ARM64_REG_X16, ARM64_REG_X17);
-  gum_arm64_writer_put_br_reg (aw, ARM64_REG_X16);
+  gum_arm64_writer_put_ret_reg (aw, ARM64_REG_X16);
 }

Original file line number	Diff line number	Diff line change
`@@ -1145,5 +1145,5 @@ gum_emit_epilog (GumArm64Writer * aw)`
`1145`	`1145`	`gum_arm64_writer_put_pop_reg_reg (aw, ARM64_REG_Q0 + i, ARM64_REG_Q1 + i);`
`1146`	`1146`
`1147`	`1147`	`gum_arm64_writer_put_pop_reg_reg (aw, ARM64_REG_X16, ARM64_REG_X17);`
`1148`		`- gum_arm64_writer_put_br_reg (aw, ARM64_REG_X16);`
	`1148`	`+ gum_arm64_writer_put_ret_reg (aw, ARM64_REG_X16);`
`1149`	`1149`	`}`