objtool/LoongArch: Enable orc to be built

[linux-2.6-block.git] / tools / objtool / arch / loongarch / orc.c

diff --git a/tools/objtool/arch/loongarch/orc.c b/tools/objtool/arch/loongarch/orc.c
new file mode 100644 (file)
index 0000000..873536d
--- /dev/null
+++ b/tools/objtool/arch/loongarch/orc.c
@@ -0,0 +1,171 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include <linux/objtool_types.h>
+#include <asm/orc_types.h>
+
+#include <objtool/check.h>
+#include <objtool/orc.h>
+#include <objtool/warn.h>
+#include <objtool/endianness.h>
+
+int init_orc_entry(struct orc_entry *orc, struct cfi_state *cfi, struct instruction *insn)
+{
+       struct cfi_reg *fp = &cfi->regs[CFI_FP];
+       struct cfi_reg *ra = &cfi->regs[CFI_RA];
+
+       memset(orc, 0, sizeof(*orc));
+
+       if (!cfi) {
+               /*
+                * This is usually either unreachable nops/traps (which don't
+                * trigger unreachable instruction warnings), or
+                * STACK_FRAME_NON_STANDARD functions.
+                */
+               orc->type = ORC_TYPE_UNDEFINED;
+               return 0;
+       }
+
+       switch (cfi->type) {
+       case UNWIND_HINT_TYPE_UNDEFINED:
+               orc->type = ORC_TYPE_UNDEFINED;
+               return 0;
+       case UNWIND_HINT_TYPE_END_OF_STACK:
+               orc->type = ORC_TYPE_END_OF_STACK;
+               return 0;
+       case UNWIND_HINT_TYPE_CALL:
+               orc->type = ORC_TYPE_CALL;
+               break;
+       case UNWIND_HINT_TYPE_REGS:
+               orc->type = ORC_TYPE_REGS;
+               break;
+       case UNWIND_HINT_TYPE_REGS_PARTIAL:
+               orc->type = ORC_TYPE_REGS_PARTIAL;
+               break;
+       default:
+               WARN_INSN(insn, "unknown unwind hint type %d", cfi->type);
+               return -1;
+       }
+
+       orc->signal = cfi->signal;
+
+       switch (cfi->cfa.base) {
+       case CFI_SP:
+               orc->sp_reg = ORC_REG_SP;
+               break;
+       case CFI_FP:
+               orc->sp_reg = ORC_REG_FP;
+               break;
+       default:
+               WARN_INSN(insn, "unknown CFA base reg %d", cfi->cfa.base);
+               return -1;
+       }
+
+       switch (fp->base) {
+       case CFI_UNDEFINED:
+               orc->fp_reg = ORC_REG_UNDEFINED;
+               orc->fp_offset = 0;
+               break;
+       case CFI_CFA:
+               orc->fp_reg = ORC_REG_PREV_SP;
+               orc->fp_offset = fp->offset;
+               break;
+       case CFI_FP:
+               orc->fp_reg = ORC_REG_FP;
+               break;
+       default:
+               WARN_INSN(insn, "unknown FP base reg %d", fp->base);
+               return -1;
+       }
+
+       switch (ra->base) {
+       case CFI_UNDEFINED:
+               orc->ra_reg = ORC_REG_UNDEFINED;
+               orc->ra_offset = 0;
+               break;
+       case CFI_CFA:
+               orc->ra_reg = ORC_REG_PREV_SP;
+               orc->ra_offset = ra->offset;
+               break;
+       case CFI_FP:
+               orc->ra_reg = ORC_REG_FP;
+               break;
+       default:
+               WARN_INSN(insn, "unknown RA base reg %d", ra->base);
+               return -1;
+       }
+
+       orc->sp_offset = cfi->cfa.offset;
+
+       return 0;
+}
+
+int write_orc_entry(struct elf *elf, struct section *orc_sec,
+                   struct section *ip_sec, unsigned int idx,
+                   struct section *insn_sec, unsigned long insn_off,
+                   struct orc_entry *o)
+{
+       struct orc_entry *orc;
+
+       /* populate ORC data */
+       orc = (struct orc_entry *)orc_sec->data->d_buf + idx;
+       memcpy(orc, o, sizeof(*orc));
+
+       /* populate reloc for ip */
+       if (!elf_init_reloc_text_sym(elf, ip_sec, idx * sizeof(int), idx,
+                                    insn_sec, insn_off))
+               return -1;
+
+       return 0;
+}
+
+static const char *reg_name(unsigned int reg)
+{
+       switch (reg) {
+       case ORC_REG_SP:
+               return "sp";
+       case ORC_REG_FP:
+               return "fp";
+       case ORC_REG_PREV_SP:
+               return "prevsp";
+       default:
+               return "?";
+       }
+}
+
+static const char *orc_type_name(unsigned int type)
+{
+       switch (type) {
+       case UNWIND_HINT_TYPE_CALL:
+               return "call";
+       case UNWIND_HINT_TYPE_REGS:
+               return "regs";
+       case UNWIND_HINT_TYPE_REGS_PARTIAL:
+               return "regs (partial)";
+       default:
+               return "?";
+       }
+}
+
+static void print_reg(unsigned int reg, int offset)
+{
+       if (reg == ORC_REG_UNDEFINED)
+               printf(" (und) ");
+       else
+               printf("%s + %3d", reg_name(reg), offset);
+
+}
+
+void orc_print_dump(struct elf *dummy_elf, struct orc_entry *orc, int i)
+{
+       printf("type:%s", orc_type_name(orc[i].type));
+
+       printf(" sp:");
+       print_reg(orc[i].sp_reg, orc[i].sp_offset);
+
+       printf(" fp:");
+       print_reg(orc[i].fp_reg, orc[i].fp_offset);
+
+       printf(" ra:");
+       print_reg(orc[i].ra_reg, orc[i].ra_offset);
+
+       printf(" signal:%d\n", orc[i].signal);
+}