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Linux/tools/perf/arch/x86/util/dwarf-regs.c

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  1 /*
  2  * dwarf-regs.c : Mapping of DWARF debug register numbers into register names.
  3  * Extracted from probe-finder.c
  4  *
  5  * Written by Masami Hiramatsu <mhiramat@redhat.com>
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License as published by
  9  * the Free Software Foundation; either version 2 of the License, or
 10  * (at your option) any later version.
 11  *
 12  * This program is distributed in the hope that it will be useful,
 13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15  * GNU General Public License for more details.
 16  *
 17  * You should have received a copy of the GNU General Public License
 18  * along with this program; if not, write to the Free Software
 19  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 20  *
 21  */
 22 
 23 #include <stddef.h>
 24 #include <errno.h> /* for EINVAL */
 25 #include <string.h> /* for strcmp */
 26 #include <linux/ptrace.h> /* for struct pt_regs */
 27 #include <linux/kernel.h> /* for offsetof */
 28 #include <dwarf-regs.h>
 29 
 30 /*
 31  * See arch/x86/kernel/ptrace.c.
 32  * Different from it:
 33  *
 34  *  - Since struct pt_regs is defined differently for user and kernel,
 35  *    but we want to use 'ax, bx' instead of 'rax, rbx' (which is struct
 36  *    field name of user's pt_regs), we make REG_OFFSET_NAME to accept
 37  *    both string name and reg field name.
 38  *
 39  *  - Since accessing x86_32's pt_regs from x86_64 building is difficult
 40  *    and vise versa, we simply fill offset with -1, so
 41  *    get_arch_regstr() still works but regs_query_register_offset()
 42  *    returns error.
 43  *    The only inconvenience caused by it now is that we are not allowed
 44  *    to generate BPF prologue for a x86_64 kernel if perf is built for
 45  *    x86_32. This is really a rare usecase.
 46  *
 47  *  - Order is different from kernel's ptrace.c for get_arch_regstr(). Use
 48  *    the order defined by dwarf.
 49  */
 50 
 51 struct pt_regs_offset {
 52         const char *name;
 53         int offset;
 54 };
 55 
 56 #define REG_OFFSET_END {.name = NULL, .offset = 0}
 57 
 58 #ifdef __x86_64__
 59 # define REG_OFFSET_NAME_64(n, r) {.name = n, .offset = offsetof(struct pt_regs, r)}
 60 # define REG_OFFSET_NAME_32(n, r) {.name = n, .offset = -1}
 61 #else
 62 # define REG_OFFSET_NAME_64(n, r) {.name = n, .offset = -1}
 63 # define REG_OFFSET_NAME_32(n, r) {.name = n, .offset = offsetof(struct pt_regs, r)}
 64 #endif
 65 
 66 /* TODO: switching by dwarf address size */
 67 #ifndef __x86_64__
 68 static const struct pt_regs_offset x86_32_regoffset_table[] = {
 69         REG_OFFSET_NAME_32("%ax",       eax),
 70         REG_OFFSET_NAME_32("%cx",       ecx),
 71         REG_OFFSET_NAME_32("%dx",       edx),
 72         REG_OFFSET_NAME_32("%bx",       ebx),
 73         REG_OFFSET_NAME_32("$stack",    esp),   /* Stack address instead of %sp */
 74         REG_OFFSET_NAME_32("%bp",       ebp),
 75         REG_OFFSET_NAME_32("%si",       esi),
 76         REG_OFFSET_NAME_32("%di",       edi),
 77         REG_OFFSET_END,
 78 };
 79 
 80 #define regoffset_table x86_32_regoffset_table
 81 #else
 82 static const struct pt_regs_offset x86_64_regoffset_table[] = {
 83         REG_OFFSET_NAME_64("%ax",       rax),
 84         REG_OFFSET_NAME_64("%dx",       rdx),
 85         REG_OFFSET_NAME_64("%cx",       rcx),
 86         REG_OFFSET_NAME_64("%bx",       rbx),
 87         REG_OFFSET_NAME_64("%si",       rsi),
 88         REG_OFFSET_NAME_64("%di",       rdi),
 89         REG_OFFSET_NAME_64("%bp",       rbp),
 90         REG_OFFSET_NAME_64("%sp",       rsp),
 91         REG_OFFSET_NAME_64("%r8",       r8),
 92         REG_OFFSET_NAME_64("%r9",       r9),
 93         REG_OFFSET_NAME_64("%r10",      r10),
 94         REG_OFFSET_NAME_64("%r11",      r11),
 95         REG_OFFSET_NAME_64("%r12",      r12),
 96         REG_OFFSET_NAME_64("%r13",      r13),
 97         REG_OFFSET_NAME_64("%r14",      r14),
 98         REG_OFFSET_NAME_64("%r15",      r15),
 99         REG_OFFSET_END,
100 };
101 
102 #define regoffset_table x86_64_regoffset_table
103 #endif
104 
105 /* Minus 1 for the ending REG_OFFSET_END */
106 #define ARCH_MAX_REGS ((sizeof(regoffset_table) / sizeof(regoffset_table[0])) - 1)
107 
108 /* Return architecture dependent register string (for kprobe-tracer) */
109 const char *get_arch_regstr(unsigned int n)
110 {
111         return (n < ARCH_MAX_REGS) ? regoffset_table[n].name : NULL;
112 }
113 
114 /* Reuse code from arch/x86/kernel/ptrace.c */
115 /**
116  * regs_query_register_offset() - query register offset from its name
117  * @name:       the name of a register
118  *
119  * regs_query_register_offset() returns the offset of a register in struct
120  * pt_regs from its name. If the name is invalid, this returns -EINVAL;
121  */
122 int regs_query_register_offset(const char *name)
123 {
124         const struct pt_regs_offset *roff;
125         for (roff = regoffset_table; roff->name != NULL; roff++)
126                 if (!strcmp(roff->name, name))
127                         return roff->offset;
128         return -EINVAL;
129 }
130 

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