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// SPDX-License-Identifier: GPL-2.0
/*
* dwarf-regs.c : Mapping of DWARF debug register numbers into register names.
*
* Written by: Masami Hiramatsu <mhiramat@kernel.org>
*/
#include <stdlib.h>
#include <string.h>
#include <debug.h>
#include <dwarf-regs.h>
#include <elf.h>
#include <errno.h>
#include <linux/kernel.h>
/* Define const char * {arch}_register_tbl[] */
#define DEFINE_DWARF_REGSTR_TABLE
#include "../arch/x86/include/dwarf-regs-table.h"
#include "../arch/arm/include/dwarf-regs-table.h"
#include "../arch/arm64/include/dwarf-regs-table.h"
#include "../arch/sh/include/dwarf-regs-table.h"
#include "../arch/powerpc/include/dwarf-regs-table.h"
#include "../arch/riscv/include/dwarf-regs-table.h"
#include "../arch/s390/include/dwarf-regs-table.h"
#include "../arch/sparc/include/dwarf-regs-table.h"
#include "../arch/xtensa/include/dwarf-regs-table.h"
#include "../arch/mips/include/dwarf-regs-table.h"
#include "../arch/loongarch/include/dwarf-regs-table.h"
/* Return architecture dependent register string (for kprobe-tracer) */
const char *get_dwarf_regstr(unsigned int n, unsigned int machine, unsigned int flags)
{
#define __get_dwarf_regstr(tbl, n) (((n) < ARRAY_SIZE(tbl)) ? (tbl)[(n)] : NULL)
if (machine == EM_NONE) {
/* Generic arch - use host arch */
machine = EM_HOST;
}
switch (machine) {
case EM_386:
return __get_dwarf_regstr(x86_32_regstr_tbl, n);
case EM_X86_64:
return __get_dwarf_regstr(x86_64_regstr_tbl, n);
case EM_ARM:
return __get_dwarf_regstr(arm_regstr_tbl, n);
case EM_AARCH64:
return __get_dwarf_regstr(aarch64_regstr_tbl, n);
case EM_CSKY:
return __get_csky_regstr(n, flags);
case EM_SH:
return __get_dwarf_regstr(sh_regstr_tbl, n);
case EM_S390:
return __get_dwarf_regstr(s390_regstr_tbl, n);
case EM_PPC:
case EM_PPC64:
return __get_dwarf_regstr(powerpc_regstr_tbl, n);
case EM_RISCV:
return __get_dwarf_regstr(riscv_regstr_tbl, n);
case EM_SPARC:
case EM_SPARCV9:
return __get_dwarf_regstr(sparc_regstr_tbl, n);
case EM_XTENSA:
return __get_dwarf_regstr(xtensa_regstr_tbl, n);
case EM_MIPS:
return __get_dwarf_regstr(mips_regstr_tbl, n);
case EM_LOONGARCH:
return __get_dwarf_regstr(loongarch_regstr_tbl, n);
default:
pr_err("ELF MACHINE %x is not supported.\n", machine);
}
return NULL;
#undef __get_dwarf_regstr
}
static int __get_dwarf_regnum(const char *const *regstr, size_t num_regstr, const char *name)
{
for (size_t i = 0; i < num_regstr; i++) {
if (regstr[i] && !strcmp(regstr[i], name))
return i;
}
return -ENOENT;
}
/* Return DWARF register number from architecture register name */
int get_dwarf_regnum(const char *name, unsigned int machine, unsigned int flags)
{
char *regname = strdup(name);
int reg = -1;
char *p;
#define _get_dwarf_regnum(tbl, name) __get_dwarf_regnum(tbl, ARRAY_SIZE(tbl), name)
if (regname == NULL)
return -EINVAL;
/* For convenience, remove trailing characters */
p = strpbrk(regname, " ,)");
if (p)
*p = '\0';
if (machine == EM_NONE) {
/* Generic arch - use host arch */
machine = EM_HOST;
}
switch (machine) {
case EM_X86_64:
reg = __get_dwarf_regnum_x86_64(name);
break;
case EM_386:
reg = __get_dwarf_regnum_i386(name);
break;
case EM_ARM:
reg = _get_dwarf_regnum(arm_regstr_tbl, name);
break;
case EM_AARCH64:
reg = _get_dwarf_regnum(aarch64_regstr_tbl, name);
break;
case EM_CSKY:
reg = __get_csky_regnum(name, flags);
break;
case EM_SH:
reg = _get_dwarf_regnum(sh_regstr_tbl, name);
break;
case EM_S390:
reg = _get_dwarf_regnum(s390_regstr_tbl, name);
break;
case EM_PPC:
case EM_PPC64:
reg = _get_dwarf_regnum(powerpc_regstr_tbl, name);
break;
case EM_RISCV:
reg = _get_dwarf_regnum(riscv_regstr_tbl, name);
break;
case EM_SPARC:
case EM_SPARCV9:
reg = _get_dwarf_regnum(sparc_regstr_tbl, name);
break;
case EM_XTENSA:
reg = _get_dwarf_regnum(xtensa_regstr_tbl, name);
break;
case EM_MIPS:
reg = _get_dwarf_regnum(mips_regstr_tbl, name);
break;
case EM_LOONGARCH:
reg = _get_dwarf_regnum(loongarch_regstr_tbl, name);
break;
default:
pr_err("ELF MACHINE %x is not supported.\n", machine);
}
free(regname);
return reg;
#undef _get_dwarf_regnum
}
static int get_libdw_frame_nregs(unsigned int machine, unsigned int flags __maybe_unused)
{
switch (machine) {
case EM_X86_64:
return 17;
case EM_386:
return 9;
case EM_ARM:
return 16;
case EM_AARCH64:
return 97;
case EM_CSKY:
return 38;
case EM_S390:
return 32;
case EM_PPC:
case EM_PPC64:
return 145;
case EM_RISCV:
return 66;
case EM_SPARC:
case EM_SPARCV9:
return 103;
case EM_LOONGARCH:
return 74;
case EM_MIPS:
return 71;
default:
return 0;
}
}
int get_dwarf_regnum_for_perf_regnum(int perf_regnum, unsigned int machine,
unsigned int flags, bool only_libdw_supported)
{
int reg;
switch (machine) {
case EM_X86_64:
reg = __get_dwarf_regnum_for_perf_regnum_x86_64(perf_regnum);
break;
case EM_386:
reg = __get_dwarf_regnum_for_perf_regnum_i386(perf_regnum);
break;
case EM_ARM:
reg = __get_dwarf_regnum_for_perf_regnum_arm(perf_regnum);
break;
case EM_AARCH64:
reg = __get_dwarf_regnum_for_perf_regnum_arm64(perf_regnum);
break;
case EM_CSKY:
reg = __get_dwarf_regnum_for_perf_regnum_csky(perf_regnum, flags);
break;
case EM_PPC:
case EM_PPC64:
reg = __get_dwarf_regnum_for_perf_regnum_powerpc(perf_regnum);
break;
case EM_RISCV:
reg = __get_dwarf_regnum_for_perf_regnum_riscv(perf_regnum);
break;
case EM_S390:
reg = __get_dwarf_regnum_for_perf_regnum_s390(perf_regnum);
break;
case EM_LOONGARCH:
reg = __get_dwarf_regnum_for_perf_regnum_loongarch(perf_regnum);
break;
case EM_MIPS:
reg = __get_dwarf_regnum_for_perf_regnum_mips(perf_regnum);
break;
default:
pr_err("ELF MACHINE %x is not supported.\n", machine);
return -ENOENT;
}
if (reg >= 0 && only_libdw_supported) {
int nregs = get_libdw_frame_nregs(machine, flags);
if (reg >= nregs)
reg = -ENOENT;
}
return reg;
}
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