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s390/perf: define common DWARF register string table

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Instead of defining DWARF register to string table in dwarf-regs-table.h
and dwarf-regs.c, use a common table in dwarf-regs-table.h.

Ensure that the DWARF register table is up-to-date with
http://refspecs.linuxfoundation.org/ELF/zSeries/lzsabi0_s390/x1542.html.

For unwinding with libdw, also ensure to correctly setup the DWARF
register frame according to the register mappings.  Currently, libdw
supports up to 32 registers only.

Suggested-by: Thomas Richter <tmricht@linux.vnet.ibm.com>
Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Reviewed-and-tested-by: Thomas Richter <tmricht@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Hendrik Brueckner 2017-11-08 09:01:12 +01:00 committed by Martin Schwidefsky
parent f704ef4460
commit a9fc2db0a8
3 changed files with 81 additions and 22 deletions
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73
tools/perf/arch/s390/include/dwarf-regs-table.h
View File

@ -1,9 +1,72 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef S390_DWARF_REGS_TABLE_H
#define S390_DWARF_REGS_TABLE_H
#define REG_DWARFNUM_NAME(reg, idx) [idx] = "%" #reg
/*
* For reference, see DWARF register mapping:
* http://refspecs.linuxfoundation.org/ELF/zSeries/lzsabi0_s390/x1542.html
*/
static const char * const s390_dwarf_regs[] = {
"%r0", "%r1", "%r2", "%r3", "%r4", "%r5", "%r6", "%r7",
"%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15",
REG_DWARFNUM_NAME(f0, 16),
REG_DWARFNUM_NAME(f1, 20),
REG_DWARFNUM_NAME(f2, 17),
REG_DWARFNUM_NAME(f3, 21),
REG_DWARFNUM_NAME(f4, 18),
REG_DWARFNUM_NAME(f5, 22),
REG_DWARFNUM_NAME(f6, 19),
REG_DWARFNUM_NAME(f7, 23),
REG_DWARFNUM_NAME(f8, 24),
REG_DWARFNUM_NAME(f9, 28),
REG_DWARFNUM_NAME(f10, 25),
REG_DWARFNUM_NAME(f11, 29),
REG_DWARFNUM_NAME(f12, 26),
REG_DWARFNUM_NAME(f13, 30),
REG_DWARFNUM_NAME(f14, 27),
REG_DWARFNUM_NAME(f15, 31),
REG_DWARFNUM_NAME(c0, 32),
REG_DWARFNUM_NAME(c1, 33),
REG_DWARFNUM_NAME(c2, 34),
REG_DWARFNUM_NAME(c3, 35),
REG_DWARFNUM_NAME(c4, 36),
REG_DWARFNUM_NAME(c5, 37),
REG_DWARFNUM_NAME(c6, 38),
REG_DWARFNUM_NAME(c7, 39),
REG_DWARFNUM_NAME(c8, 40),
REG_DWARFNUM_NAME(c9, 41),
REG_DWARFNUM_NAME(c10, 42),
REG_DWARFNUM_NAME(c11, 43),
REG_DWARFNUM_NAME(c12, 44),
REG_DWARFNUM_NAME(c13, 45),
REG_DWARFNUM_NAME(c14, 46),
REG_DWARFNUM_NAME(c15, 47),
REG_DWARFNUM_NAME(a0, 48),
REG_DWARFNUM_NAME(a1, 49),
REG_DWARFNUM_NAME(a2, 50),
REG_DWARFNUM_NAME(a3, 51),
REG_DWARFNUM_NAME(a4, 52),
REG_DWARFNUM_NAME(a5, 53),
REG_DWARFNUM_NAME(a6, 54),
REG_DWARFNUM_NAME(a7, 55),
REG_DWARFNUM_NAME(a8, 56),
REG_DWARFNUM_NAME(a9, 57),
REG_DWARFNUM_NAME(a10, 58),
REG_DWARFNUM_NAME(a11, 59),
REG_DWARFNUM_NAME(a12, 60),
REG_DWARFNUM_NAME(a13, 61),
REG_DWARFNUM_NAME(a14, 62),
REG_DWARFNUM_NAME(a15, 63),
REG_DWARFNUM_NAME(pswm, 64),
REG_DWARFNUM_NAME(pswa, 65),
};
#ifdef DEFINE_DWARF_REGSTR_TABLE
/* This is included in perf/util/dwarf-regs.c */
static const char * const s390_regstr_tbl[] = {
"%r0", "%r1", "%r2", "%r3", "%r4", "%r5", "%r6", "%r7",
"%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15",
};
#endif
#define s390_regstr_tbl s390_dwarf_regs
#endif /* DEFINE_DWARF_REGSTR_TABLE */
#endif /* S390_DWARF_REGS_TABLE_H */

15
tools/perf/arch/s390/util/dwarf-regs.c
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@ -9,19 +9,10 @@
#include <stddef.h>
#include <dwarf-regs.h>
#define NUM_GPRS 16
static const char *gpr_names[NUM_GPRS] = {
"%r0", "%r1", "%r2", "%r3", "%r4", "%r5", "%r6", "%r7",
"%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15",
};
#include <linux/kernel.h>
#include "dwarf-regs-table.h"
const char *get_arch_regstr(unsigned int n)
{
if (n == 64)
return "mask";
if (n == 65)
return "pc";
return (n >= NUM_GPRS) ? NULL : gpr_names[n];
return (n >= ARRAY_SIZE(s390_dwarf_regs)) ? NULL : s390_dwarf_regs[n];
}

15
tools/perf/arch/s390/util/unwind-libdw.c
View File

@ -1,21 +1,26 @@
#include <linux/kernel.h>
#include <elfutils/libdwfl.h>
#include "../../util/unwind-libdw.h"
#include "../../util/perf_regs.h"
#include "../../util/event.h"
#include "dwarf-regs-table.h"
bool libdw__arch_set_initial_registers(Dwfl_Thread *thread, void *arg)
{
struct unwind_info *ui = arg;
struct regs_dump *user_regs = &ui->sample->user_regs;
Dwarf_Word dwarf_regs[PERF_REG_S390_MAX];
Dwarf_Word dwarf_regs[ARRAY_SIZE(s390_dwarf_regs)];
#define REG(r) ({ \
Dwarf_Word val = 0; \
perf_reg_value(&val, user_regs, PERF_REG_S390_##r); \
val; \
})
/*
* For DWARF register mapping details,
* see also perf/arch/s390/include/dwarf-regs-table.h
*/
dwarf_regs[0] = REG(R0);
dwarf_regs[1] = REG(R1);
dwarf_regs[2] = REG(R2);
@ -32,9 +37,9 @@ bool libdw__arch_set_initial_registers(Dwfl_Thread *thread, void *arg)
dwarf_regs[13] = REG(R13);
dwarf_regs[14] = REG(R14);
dwarf_regs[15] = REG(R15);
dwarf_regs[16] = REG(MASK);
dwarf_regs[17] = REG(PC);
dwarf_regs[64] = REG(MASK);
dwarf_regs[65] = REG(PC);
dwfl_thread_state_register_pc(thread, dwarf_regs[17]);
dwfl_thread_state_register_pc(thread, dwarf_regs[65]);
return dwfl_thread_state_registers(thread, 0, 16, dwarf_regs);
}