tools/perf/arch/powerpc/util/perf_regs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <errno.h>
   3 #include <string.h>
   4 #include <regex.h>
   5 #include <linux/zalloc.h>
   6
   7 #include "../../util/perf_regs.h"
   8 #include "../../util/debug.h"
   9
  10 #include <linux/kernel.h>
  11
  12 const struct sample_reg sample_reg_masks[] = {
  13         SMPL_REG(r0, PERF_REG_POWERPC_R0),
  14         SMPL_REG(r1, PERF_REG_POWERPC_R1),
  15         SMPL_REG(r2, PERF_REG_POWERPC_R2),
  16         SMPL_REG(r3, PERF_REG_POWERPC_R3),
  17         SMPL_REG(r4, PERF_REG_POWERPC_R4),
  18         SMPL_REG(r5, PERF_REG_POWERPC_R5),
  19         SMPL_REG(r6, PERF_REG_POWERPC_R6),
  20         SMPL_REG(r7, PERF_REG_POWERPC_R7),
  21         SMPL_REG(r8, PERF_REG_POWERPC_R8),
  22         SMPL_REG(r9, PERF_REG_POWERPC_R9),
  23         SMPL_REG(r10, PERF_REG_POWERPC_R10),
  24         SMPL_REG(r11, PERF_REG_POWERPC_R11),
  25         SMPL_REG(r12, PERF_REG_POWERPC_R12),
  26         SMPL_REG(r13, PERF_REG_POWERPC_R13),
  27         SMPL_REG(r14, PERF_REG_POWERPC_R14),
  28         SMPL_REG(r15, PERF_REG_POWERPC_R15),
  29         SMPL_REG(r16, PERF_REG_POWERPC_R16),
  30         SMPL_REG(r17, PERF_REG_POWERPC_R17),
  31         SMPL_REG(r18, PERF_REG_POWERPC_R18),
  32         SMPL_REG(r19, PERF_REG_POWERPC_R19),
  33         SMPL_REG(r20, PERF_REG_POWERPC_R20),
  34         SMPL_REG(r21, PERF_REG_POWERPC_R21),
  35         SMPL_REG(r22, PERF_REG_POWERPC_R22),
  36         SMPL_REG(r23, PERF_REG_POWERPC_R23),
  37         SMPL_REG(r24, PERF_REG_POWERPC_R24),
  38         SMPL_REG(r25, PERF_REG_POWERPC_R25),
  39         SMPL_REG(r26, PERF_REG_POWERPC_R26),
  40         SMPL_REG(r27, PERF_REG_POWERPC_R27),
  41         SMPL_REG(r28, PERF_REG_POWERPC_R28),
  42         SMPL_REG(r29, PERF_REG_POWERPC_R29),
  43         SMPL_REG(r30, PERF_REG_POWERPC_R30),
  44         SMPL_REG(r31, PERF_REG_POWERPC_R31),
  45         SMPL_REG(nip, PERF_REG_POWERPC_NIP),
  46         SMPL_REG(msr, PERF_REG_POWERPC_MSR),
  47         SMPL_REG(orig_r3, PERF_REG_POWERPC_ORIG_R3),
  48         SMPL_REG(ctr, PERF_REG_POWERPC_CTR),
  49         SMPL_REG(link, PERF_REG_POWERPC_LINK),
  50         SMPL_REG(xer, PERF_REG_POWERPC_XER),
  51         SMPL_REG(ccr, PERF_REG_POWERPC_CCR),
  52         SMPL_REG(softe, PERF_REG_POWERPC_SOFTE),
  53         SMPL_REG(trap, PERF_REG_POWERPC_TRAP),
  54         SMPL_REG(dar, PERF_REG_POWERPC_DAR),
  55         SMPL_REG(dsisr, PERF_REG_POWERPC_DSISR),
  56         SMPL_REG(sier, PERF_REG_POWERPC_SIER),
  57         SMPL_REG(mmcra, PERF_REG_POWERPC_MMCRA),
  58         SMPL_REG_END
  59 };
  60
  61 /* REG or %rREG */
  62 #define SDT_OP_REGEX1  "^(%r)?([1-2]?[0-9]|3[0-1])$"
  63
  64 /* -NUM(REG) or NUM(REG) or -NUM(%rREG) or NUM(%rREG) */
  65 #define SDT_OP_REGEX2  "^(\\-)?([0-9]+)\\((%r)?([1-2]?[0-9]|3[0-1])\\)$"
  66
  67 static regex_t sdt_op_regex1, sdt_op_regex2;
  68
  69 static int sdt_init_op_regex(void)
  70 {
  71         static int initialized;
  72         int ret = 0;
  73
  74         if (initialized)
  75                 return 0;
  76
  77         ret = regcomp(&sdt_op_regex1, SDT_OP_REGEX1, REG_EXTENDED);
  78         if (ret)
  79                 goto error;
  80
  81         ret = regcomp(&sdt_op_regex2, SDT_OP_REGEX2, REG_EXTENDED);
  82         if (ret)
  83                 goto free_regex1;
  84
  85         initialized = 1;
  86         return 0;
  87
  88 free_regex1:
  89         regfree(&sdt_op_regex1);
  90 error:
  91         pr_debug4("Regex compilation error.\n");
  92         return ret;
  93 }
  94
  95 /*
  96  * Parse OP and convert it into uprobe format, which is, +/-NUM(%gprREG).
  97  * Possible variants of OP are:
  98  *      Format          Example
  99  *      -------------------------
 100  *      NUM(REG)        48(18)
 101  *      -NUM(REG)       -48(18)
 102  *      NUM(%rREG)      48(%r18)
 103  *      -NUM(%rREG)     -48(%r18)
 104  *      REG             18
 105  *      %rREG           %r18
 106  *      iNUM            i0
 107  *      i-NUM           i-1
 108  *
 109  * SDT marker arguments on Powerpc uses %rREG form with -mregnames flag
 110  * and REG form with -mno-regnames. Here REG is general purpose register,
 111  * which is in 0 to 31 range.
 112  */
 113 int arch_sdt_arg_parse_op(char *old_op, char **new_op)
 114 {
 115         int ret, new_len;
 116         regmatch_t rm[5];
 117         char prefix;
 118
 119         /* Constant argument. Uprobe does not support it */
 120         if (old_op[0] == 'i') {
 121                 pr_debug4("Skipping unsupported SDT argument: %s\n", old_op);
 122                 return SDT_ARG_SKIP;
 123         }
 124
 125         ret = sdt_init_op_regex();
 126         if (ret < 0)
 127                 return ret;
 128
 129         if (!regexec(&sdt_op_regex1, old_op, 3, rm, 0)) {
 130                 /* REG or %rREG --> %gprREG */
 131
 132                 new_len = 5;    /* % g p r NULL */
 133                 new_len += (int)(rm[2].rm_eo - rm[2].rm_so);
 134
 135                 *new_op = zalloc(new_len);
 136                 if (!*new_op)
 137                         return -ENOMEM;
 138
 139                 scnprintf(*new_op, new_len, "%%gpr%.*s",
 140                         (int)(rm[2].rm_eo - rm[2].rm_so), old_op + rm[2].rm_so);
 141         } else if (!regexec(&sdt_op_regex2, old_op, 5, rm, 0)) {
 142                 /*
 143                  * -NUM(REG) or NUM(REG) or -NUM(%rREG) or NUM(%rREG) -->
 144                  *      +/-NUM(%gprREG)
 145                  */
 146                 prefix = (rm[1].rm_so == -1) ? '+' : '-';
 147
 148                 new_len = 8;    /* +/- ( % g p r ) NULL */
 149                 new_len += (int)(rm[2].rm_eo - rm[2].rm_so);
 150                 new_len += (int)(rm[4].rm_eo - rm[4].rm_so);
 151
 152                 *new_op = zalloc(new_len);
 153                 if (!*new_op)
 154                         return -ENOMEM;
 155
 156                 scnprintf(*new_op, new_len, "%c%.*s(%%gpr%.*s)", prefix,
 157                         (int)(rm[2].rm_eo - rm[2].rm_so), old_op + rm[2].rm_so,
 158                         (int)(rm[4].rm_eo - rm[4].rm_so), old_op + rm[4].rm_so);
 159         } else {
 160                 pr_debug4("Skipping unsupported SDT argument: %s\n", old_op);
 161                 return SDT_ARG_SKIP;
 162         }
 163
 164         return SDT_ARG_VALID;
 165 }