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// SPDX-License-Identifier: GPL-2.0
#include <errno.h>
#include <string.h>
#include <regex.h>
#include <linux/zalloc.h>
#include "../../util/perf_regs.h"
#include "../../util/debug.h"
#include <linux/kernel.h>
const struct sample_reg sample_reg_masks[] = {
SMPL_REG(r0, PERF_REG_POWERPC_R0),
SMPL_REG(r1, PERF_REG_POWERPC_R1),
SMPL_REG(r2, PERF_REG_POWERPC_R2),
SMPL_REG(r3, PERF_REG_POWERPC_R3),
SMPL_REG(r4, PERF_REG_POWERPC_R4),
SMPL_REG(r5, PERF_REG_POWERPC_R5),
SMPL_REG(r6, PERF_REG_POWERPC_R6),
SMPL_REG(r7, PERF_REG_POWERPC_R7),
SMPL_REG(r8, PERF_REG_POWERPC_R8),
SMPL_REG(r9, PERF_REG_POWERPC_R9),
SMPL_REG(r10, PERF_REG_POWERPC_R10),
SMPL_REG(r11, PERF_REG_POWERPC_R11),
SMPL_REG(r12, PERF_REG_POWERPC_R12),
SMPL_REG(r13, PERF_REG_POWERPC_R13),
SMPL_REG(r14, PERF_REG_POWERPC_R14),
SMPL_REG(r15, PERF_REG_POWERPC_R15),
SMPL_REG(r16, PERF_REG_POWERPC_R16),
SMPL_REG(r17, PERF_REG_POWERPC_R17),
SMPL_REG(r18, PERF_REG_POWERPC_R18),
SMPL_REG(r19, PERF_REG_POWERPC_R19),
SMPL_REG(r20, PERF_REG_POWERPC_R20),
SMPL_REG(r21, PERF_REG_POWERPC_R21),
SMPL_REG(r22, PERF_REG_POWERPC_R22),
SMPL_REG(r23, PERF_REG_POWERPC_R23),
SMPL_REG(r24, PERF_REG_POWERPC_R24),
SMPL_REG(r25, PERF_REG_POWERPC_R25),
SMPL_REG(r26, PERF_REG_POWERPC_R26),
SMPL_REG(r27, PERF_REG_POWERPC_R27),
SMPL_REG(r28, PERF_REG_POWERPC_R28),
SMPL_REG(r29, PERF_REG_POWERPC_R29),
SMPL_REG(r30, PERF_REG_POWERPC_R30),
SMPL_REG(r31, PERF_REG_POWERPC_R31),
SMPL_REG(nip, PERF_REG_POWERPC_NIP),
SMPL_REG(msr, PERF_REG_POWERPC_MSR),
SMPL_REG(orig_r3, PERF_REG_POWERPC_ORIG_R3),
SMPL_REG(ctr, PERF_REG_POWERPC_CTR),
SMPL_REG(link, PERF_REG_POWERPC_LINK),
SMPL_REG(xer, PERF_REG_POWERPC_XER),
SMPL_REG(ccr, PERF_REG_POWERPC_CCR),
SMPL_REG(softe, PERF_REG_POWERPC_SOFTE),
SMPL_REG(trap, PERF_REG_POWERPC_TRAP),
SMPL_REG(dar, PERF_REG_POWERPC_DAR),
SMPL_REG(dsisr, PERF_REG_POWERPC_DSISR),
SMPL_REG(sier, PERF_REG_POWERPC_SIER),
SMPL_REG(mmcra, PERF_REG_POWERPC_MMCRA),
SMPL_REG_END
};
/* REG or %rREG */
#define SDT_OP_REGEX1 "^(%r)?([1-2]?[0-9]|3[0-1])$"
/* -NUM(REG) or NUM(REG) or -NUM(%rREG) or NUM(%rREG) */
#define SDT_OP_REGEX2 "^(\\-)?([0-9]+)\\((%r)?([1-2]?[0-9]|3[0-1])\\)$"
static regex_t sdt_op_regex1, sdt_op_regex2;
static int sdt_init_op_regex(void)
{
static int initialized;
int ret = 0;
if (initialized)
return 0;
ret = regcomp(&sdt_op_regex1, SDT_OP_REGEX1, REG_EXTENDED);
if (ret)
goto error;
ret = regcomp(&sdt_op_regex2, SDT_OP_REGEX2, REG_EXTENDED);
if (ret)
goto free_regex1;
initialized = 1;
return 0;
free_regex1:
regfree(&sdt_op_regex1);
error:
pr_debug4("Regex compilation error.\n");
return ret;
}
/*
* Parse OP and convert it into uprobe format, which is, +/-NUM(%gprREG).
* Possible variants of OP are:
* Format Example
* -------------------------
* NUM(REG) 48(18)
* -NUM(REG) -48(18)
* NUM(%rREG) 48(%r18)
* -NUM(%rREG) -48(%r18)
* REG 18
* %rREG %r18
* iNUM i0
* i-NUM i-1
*
* SDT marker arguments on Powerpc uses %rREG form with -mregnames flag
* and REG form with -mno-regnames. Here REG is general purpose register,
* which is in 0 to 31 range.
*/
int arch_sdt_arg_parse_op(char *old_op, char **new_op)
{
int ret, new_len;
regmatch_t rm[5];
char prefix;
/* Constant argument. Uprobe does not support it */
if (old_op[0] == 'i') {
pr_debug4("Skipping unsupported SDT argument: %s\n", old_op);
return SDT_ARG_SKIP;
}
ret = sdt_init_op_regex();
if (ret < 0)
return ret;
if (!regexec(&sdt_op_regex1, old_op, 3, rm, 0)) {
/* REG or %rREG --> %gprREG */
new_len = 5; /* % g p r NULL */
new_len += (int)(rm[2].rm_eo - rm[2].rm_so);
*new_op = zalloc(new_len);
if (!*new_op)
return -ENOMEM;
scnprintf(*new_op, new_len, "%%gpr%.*s",
(int)(rm[2].rm_eo - rm[2].rm_so), old_op + rm[2].rm_so);
} else if (!regexec(&sdt_op_regex2, old_op, 5, rm, 0)) {
/*
* -NUM(REG) or NUM(REG) or -NUM(%rREG) or NUM(%rREG) -->
* +/-NUM(%gprREG)
*/
prefix = (rm[1].rm_so == -1) ? '+' : '-';
new_len = 8; /* +/- ( % g p r ) NULL */
new_len += (int)(rm[2].rm_eo - rm[2].rm_so);
new_len += (int)(rm[4].rm_eo - rm[4].rm_so);
*new_op = zalloc(new_len);
if (!*new_op)
return -ENOMEM;
scnprintf(*new_op, new_len, "%c%.*s(%%gpr%.*s)", prefix,
(int)(rm[2].rm_eo - rm[2].rm_so), old_op + rm[2].rm_so,
(int)(rm[4].rm_eo - rm[4].rm_so), old_op + rm[4].rm_so);
} else {
pr_debug4("Skipping unsupported SDT argument: %s\n", old_op);
return SDT_ARG_SKIP;
}
return SDT_ARG_VALID;
}
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