kpatch/LoongArch: process section __patchable_function_entries

Generate 2 NOPs right at the beginning of each function with -fpatchable-function-entry=2 in LoongArch. Here process this situation. Co-developed-by: zhanghongchen <[email protected]> Signed-off-by: George Guo <[email protected]>
dynup · Dec 11, 2024 · f27619f · f27619f
1 parent e2ad05f
commit f27619f
Showing 1 changed file with 21 additions and 0 deletions.
diff --git a/kpatch-build/create-diff-object.c b/kpatch-build/create-diff-object.c
@@ -3838,6 +3838,21 @@ static void kpatch_create_ftrace_callsite_sections(struct kpatch_elf *kelf, bool
 			insn_offset = sym->sym.st_value;
 			break;
 		}
+		case LOONGARCH64: {
+			bool found = false;
+			unsigned char *insn = sym->sec->data->d_buf + sym->sym.st_value;
+
+			/* 0x03400000 is NOP instruction for LoongArch. */
+			if(insn[0] == 0x00 && insn[1] == 0x00 && insn[2] == 0x40 && insn[3] == 0x03 &&
+				insn[4] == 0x00 && insn[5] == 0x00 && insn[6] == 0x40 && insn[7] == 0x03)
+				found = true;
+
+			if (!found)
+				ERROR("%s: unexpected instruction at the start of the function", sym->name);
+
+			insn_offset = 0;
+			break;
+		}
 		default:
 			ERROR("unsupported arch");
 		}
@@ -4088,6 +4103,12 @@ static void kpatch_find_func_profiling_calls(struct kpatch_elf *kelf)
 				insn[4] == 0x00 && insn[5] == 0x00)
 				sym->has_func_profiling = 1;
 			break;
+		case LOONGARCH64:
+
+			if (kpatch_symbol_has_pfe_entry(kelf, sym))
+				sym->has_func_profiling = 1;
+			break;
+
 		default:
 			ERROR("unsupported arch");
 		}