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3eee606757
The get_dwarf_regnum() returns a DWARF register number from a register name string according to the psABI. Also add two pseudo encodings of DWARF_REG_PC which is a register that are used by PC-relative addressing and DWARF_REG_FB which is a frame base register. They need to be handled in a special way. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Ian Rogers <irogers@google.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: linux-toolchains@vger.kernel.org Cc: linux-trace-devel@vger.kernel.org Link: https://lore.kernel.org/r/20231213001323.718046-3-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* dwarf-regs.c : Mapping of DWARF debug register numbers into register names.
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*
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* Written by: Masami Hiramatsu <mhiramat@kernel.org>
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <debug.h>
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#include <dwarf-regs.h>
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#include <elf.h>
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#include <errno.h>
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#include <linux/kernel.h>
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#ifndef EM_AARCH64
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#define EM_AARCH64 183 /* ARM 64 bit */
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#endif
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#ifndef EM_LOONGARCH
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#define EM_LOONGARCH 258 /* LoongArch */
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#endif
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/* Define const char * {arch}_register_tbl[] */
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#define DEFINE_DWARF_REGSTR_TABLE
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#include "../arch/x86/include/dwarf-regs-table.h"
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#include "../arch/arm/include/dwarf-regs-table.h"
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#include "../arch/arm64/include/dwarf-regs-table.h"
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#include "../arch/sh/include/dwarf-regs-table.h"
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#include "../arch/powerpc/include/dwarf-regs-table.h"
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#include "../arch/s390/include/dwarf-regs-table.h"
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#include "../arch/sparc/include/dwarf-regs-table.h"
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#include "../arch/xtensa/include/dwarf-regs-table.h"
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#include "../arch/mips/include/dwarf-regs-table.h"
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#include "../arch/loongarch/include/dwarf-regs-table.h"
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#define __get_dwarf_regstr(tbl, n) (((n) < ARRAY_SIZE(tbl)) ? (tbl)[(n)] : NULL)
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/* Return architecture dependent register string (for kprobe-tracer) */
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const char *get_dwarf_regstr(unsigned int n, unsigned int machine)
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{
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switch (machine) {
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case EM_NONE: /* Generic arch - use host arch */
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return get_arch_regstr(n);
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case EM_386:
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return __get_dwarf_regstr(x86_32_regstr_tbl, n);
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case EM_X86_64:
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return __get_dwarf_regstr(x86_64_regstr_tbl, n);
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case EM_ARM:
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return __get_dwarf_regstr(arm_regstr_tbl, n);
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case EM_AARCH64:
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return __get_dwarf_regstr(aarch64_regstr_tbl, n);
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case EM_SH:
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return __get_dwarf_regstr(sh_regstr_tbl, n);
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case EM_S390:
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return __get_dwarf_regstr(s390_regstr_tbl, n);
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case EM_PPC:
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case EM_PPC64:
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return __get_dwarf_regstr(powerpc_regstr_tbl, n);
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case EM_SPARC:
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case EM_SPARCV9:
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return __get_dwarf_regstr(sparc_regstr_tbl, n);
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case EM_XTENSA:
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return __get_dwarf_regstr(xtensa_regstr_tbl, n);
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case EM_MIPS:
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return __get_dwarf_regstr(mips_regstr_tbl, n);
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case EM_LOONGARCH:
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return __get_dwarf_regstr(loongarch_regstr_tbl, n);
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default:
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pr_err("ELF MACHINE %x is not supported.\n", machine);
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}
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return NULL;
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}
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__weak int get_arch_regnum(const char *name __maybe_unused)
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{
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return -ENOTSUP;
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}
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/* Return DWARF register number from architecture register name */
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int get_dwarf_regnum(const char *name, unsigned int machine)
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{
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char *regname = strdup(name);
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int reg = -1;
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char *p;
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if (regname == NULL)
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return -EINVAL;
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/* For convenience, remove trailing characters */
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p = strpbrk(regname, " ,)");
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if (p)
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*p = '\0';
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switch (machine) {
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case EM_NONE: /* Generic arch - use host arch */
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reg = get_arch_regnum(regname);
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break;
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default:
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pr_err("ELF MACHINE %x is not supported.\n", machine);
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}
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free(regname);
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return reg;
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}
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