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// 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);
}
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