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author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2015-06-06 12:44:25 +0200 |
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committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-11-16 15:06:11 +0100 |
commit | c33eff600584ed493adfb42e3f130a6335f97750 (patch) | |
tree | e717a41af2f054a88ebd3617d1ae8da2dc8c03c0 /arch/s390/kernel/perf_regs.c | |
parent | 9232c3c741200167e44ae9d0e434092657ab4534 (diff) | |
download | linux-c33eff600584ed493adfb42e3f130a6335f97750.tar.bz2 |
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>
Diffstat (limited to 'arch/s390/kernel/perf_regs.c')
-rw-r--r-- | arch/s390/kernel/perf_regs.c | 49 |
1 files changed, 49 insertions, 0 deletions
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); +} |