3bb53c9f12
Since HAVE_KPROBES can be enabled in arm64, this patch introduces regs_query_register_offset() to convert register name to offset for arm64, so the BPF prologue feature is ready to use. Signed-off-by: He Kuang <hekuang@huawei.com> Reviewed-by: Will Deacon <will.deacon@arm.com> Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Bintian Wang <bintian.wang@huawei.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Wang Nan <wangnan0@huawei.com> Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/20170207073412.26983-1-hekuang@huawei.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
/*
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* Mapping of DWARF debug register numbers into register names.
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*
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* Copyright (C) 2010 Will Deacon, ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <stddef.h>
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#include <dwarf-regs.h>
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#include <linux/ptrace.h> /* for struct user_pt_regs */
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#include "util.h"
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struct pt_regs_dwarfnum {
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const char *name;
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unsigned int dwarfnum;
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};
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#define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num}
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#define GPR_DWARFNUM_NAME(num) \
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{.name = STR(%x##num), .dwarfnum = num}
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#define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0}
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#define DWARFNUM2OFFSET(index) \
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(index * sizeof((struct user_pt_regs *)0)->regs[0])
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/*
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* Reference:
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* http://infocenter.arm.com/help/topic/com.arm.doc.ihi0057b/IHI0057B_aadwarf64.pdf
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*/
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static const struct pt_regs_dwarfnum regdwarfnum_table[] = {
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GPR_DWARFNUM_NAME(0),
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GPR_DWARFNUM_NAME(1),
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GPR_DWARFNUM_NAME(2),
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GPR_DWARFNUM_NAME(3),
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GPR_DWARFNUM_NAME(4),
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GPR_DWARFNUM_NAME(5),
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GPR_DWARFNUM_NAME(6),
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GPR_DWARFNUM_NAME(7),
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GPR_DWARFNUM_NAME(8),
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GPR_DWARFNUM_NAME(9),
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GPR_DWARFNUM_NAME(10),
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GPR_DWARFNUM_NAME(11),
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GPR_DWARFNUM_NAME(12),
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GPR_DWARFNUM_NAME(13),
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GPR_DWARFNUM_NAME(14),
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GPR_DWARFNUM_NAME(15),
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GPR_DWARFNUM_NAME(16),
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GPR_DWARFNUM_NAME(17),
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GPR_DWARFNUM_NAME(18),
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GPR_DWARFNUM_NAME(19),
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GPR_DWARFNUM_NAME(20),
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GPR_DWARFNUM_NAME(21),
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GPR_DWARFNUM_NAME(22),
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GPR_DWARFNUM_NAME(23),
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GPR_DWARFNUM_NAME(24),
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GPR_DWARFNUM_NAME(25),
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GPR_DWARFNUM_NAME(26),
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GPR_DWARFNUM_NAME(27),
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GPR_DWARFNUM_NAME(28),
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GPR_DWARFNUM_NAME(29),
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REG_DWARFNUM_NAME("%lr", 30),
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REG_DWARFNUM_NAME("%sp", 31),
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REG_DWARFNUM_END,
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};
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/**
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* get_arch_regstr() - lookup register name from it's DWARF register number
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* @n: the DWARF register number
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*
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* get_arch_regstr() returns the name of the register in struct
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* regdwarfnum_table from it's DWARF register number. If the register is not
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* found in the table, this returns NULL;
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*/
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const char *get_arch_regstr(unsigned int n)
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{
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const struct pt_regs_dwarfnum *roff;
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for (roff = regdwarfnum_table; roff->name != NULL; roff++)
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if (roff->dwarfnum == n)
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return roff->name;
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return NULL;
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}
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int regs_query_register_offset(const char *name)
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{
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const struct pt_regs_dwarfnum *roff;
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for (roff = regdwarfnum_table; roff->name != NULL; roff++)
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if (!strcmp(roff->name, name))
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return DWARFNUM2OFFSET(roff->dwarfnum);
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return -EINVAL;
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}
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