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author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2015-06-06 13:44:25 +0300 |
---|---|---|
committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-11-16 17:06:11 +0300 |
commit | c33eff600584ed493adfb42e3f130a6335f97750 (patch) | |
tree | e717a41af2f054a88ebd3617d1ae8da2dc8c03c0 | |
parent | 9232c3c741200167e44ae9d0e434092657ab4534 (diff) | |
download | linux-c33eff600584ed493adfb42e3f130a6335f97750.tar.xz |
s390/perf: add perf_regs support and user stack dump
Add s390 support to dump user stack to user space for DWARF
stack unwinding.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-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>
-rw-r--r-- | arch/s390/Kconfig | 2 | ||||
-rw-r--r-- | arch/s390/include/uapi/asm/perf_regs.h | 27 | ||||
-rw-r--r-- | arch/s390/kernel/Makefile | 2 | ||||
-rw-r--r-- | arch/s390/kernel/perf_regs.c | 49 |
4 files changed, 79 insertions, 1 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 84767046daff..829c67986db7 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -159,6 +159,8 @@ config S390 select HAVE_KRETPROBES select HAVE_KVM select HAVE_LIVEPATCH + select HAVE_PERF_REGS + select HAVE_PERF_USER_STACK_DUMP select HAVE_MEMBLOCK select HAVE_MEMBLOCK_NODE_MAP select HAVE_MEMBLOCK_PHYS_MAP diff --git a/arch/s390/include/uapi/asm/perf_regs.h b/arch/s390/include/uapi/asm/perf_regs.h new file mode 100644 index 000000000000..f84ea6a181d3 --- /dev/null +++ b/arch/s390/include/uapi/asm/perf_regs.h @@ -0,0 +1,27 @@ +#ifndef _ASM_S390_PERF_REGS_H +#define _ASM_S390_PERF_REGS_H + +enum perf_event_s390_regs { + PERF_REG_S390_R0, + PERF_REG_S390_R1, + PERF_REG_S390_R2, + PERF_REG_S390_R3, + PERF_REG_S390_R4, + PERF_REG_S390_R5, + PERF_REG_S390_R6, + PERF_REG_S390_R7, + PERF_REG_S390_R8, + PERF_REG_S390_R9, + PERF_REG_S390_R10, + PERF_REG_S390_R11, + PERF_REG_S390_R12, + PERF_REG_S390_R13, + PERF_REG_S390_R14, + PERF_REG_S390_R15, + PERF_REG_S390_MASK, + PERF_REG_S390_PC, + + PERF_REG_S390_MAX +}; + +#endif /* _ASM_S390_PERF_REGS_H */ diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile index 0319f4e81ea4..909bce65cb2b 100644 --- a/arch/s390/kernel/Makefile +++ b/arch/s390/kernel/Makefile @@ -79,7 +79,7 @@ obj-$(CONFIG_CRASH_DUMP) += crash_dump.o obj-$(CONFIG_UPROBES) += uprobes.o obj-$(CONFIG_PERF_EVENTS) += perf_event.o perf_cpum_cf.o perf_cpum_sf.o -obj-$(CONFIG_PERF_EVENTS) += perf_cpum_cf_events.o +obj-$(CONFIG_PERF_EVENTS) += perf_cpum_cf_events.o perf_regs.o obj-$(CONFIG_TRACEPOINTS) += trace.o diff --git a/arch/s390/kernel/perf_regs.c b/arch/s390/kernel/perf_regs.c new file mode 100644 index 000000000000..e883e6a2146a --- /dev/null +++ b/arch/s390/kernel/perf_regs.c @@ -0,0 +1,49 @@ +#include <linux/perf_event.h> +#include <linux/perf_regs.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/bug.h> +#include <asm/ptrace.h> + +u64 perf_reg_value(struct pt_regs *regs, int idx) +{ + if (WARN_ON_ONCE((u32)idx >= PERF_REG_S390_MAX)) + return 0; + + if (idx == PERF_REG_S390_MASK) + return regs->psw.mask; + if (idx == PERF_REG_S390_PC) + return regs->psw.addr; + + return regs->gprs[idx]; +} + +#define REG_RESERVED (~((1UL << PERF_REG_S390_MAX) - 1)) + +int perf_reg_validate(u64 mask) +{ + if (!mask || mask & REG_RESERVED) + return -EINVAL; + + return 0; +} + +u64 perf_reg_abi(struct task_struct *task) +{ + if (test_tsk_thread_flag(task, TIF_31BIT)) + return PERF_SAMPLE_REGS_ABI_32; + + return PERF_SAMPLE_REGS_ABI_64; +} + +void perf_get_regs_user(struct perf_regs *regs_user, + struct pt_regs *regs, + struct pt_regs *regs_user_copy) +{ + /* + * Use the regs from the first interruption and let + * perf_sample_regs_intr() handle interrupts (regs == get_irq_regs()). + */ + regs_user->regs = task_pt_regs(current); + regs_user->abi = perf_reg_abi(current); +} |