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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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15
tools/perf/arch/s390/util/dwarf-regs.c
View File

@@ -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);
}