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    Subject[PATCH 02/16] perf: Unified API to record selective sets of arch registers
    Date
    This brings a new API to help the selective dump of registers on
    event sampling, and its implementation in x86.

    - The informations about the desired registers will be passed
    to a single u64 mask. It's up to the architecture to map the
    registers into the mask bits.

    - The architecture must provide a non-zero and unique id to
    identify the origin of a register set because interpreting a
    register dump requires to know from which architecture it comes.
    The achitecture is considered different between the 32 and 64 bits
    version. x86-32 has the id 1, x86-64 has the id 2.

    Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
    Signed-off-by: Jiri Olsa <jolsa@redhat.com>
    ---
    arch/x86/include/asm/perf_regs.h | 16 ++++++
    arch/x86/include/asm/perf_regs_32.h | 84 +++++++++++++++++++++++++++++
    arch/x86/include/asm/perf_regs_64.h | 101 +++++++++++++++++++++++++++++++++++
    include/asm-generic/perf_regs.h | 23 ++++++++
    4 files changed, 224 insertions(+), 0 deletions(-)
    create mode 100644 arch/x86/include/asm/perf_regs.h
    create mode 100644 arch/x86/include/asm/perf_regs_32.h
    create mode 100644 arch/x86/include/asm/perf_regs_64.h
    create mode 100644 include/asm-generic/perf_regs.h

    diff --git a/arch/x86/include/asm/perf_regs.h b/arch/x86/include/asm/perf_regs.h
    new file mode 100644
    index 0000000..80b7fbe
    --- /dev/null
    +++ b/arch/x86/include/asm/perf_regs.h
    @@ -0,0 +1,16 @@
    +#ifndef _ASM_X86_PERF_REGS_H
    +#define _ASM_X86_PERF_REGS_H
    +
    +enum {
    + PERF_REGS_VERSION_NONE = 0UL,
    + PERF_REGS_VERSION_X86_32 = 1UL,
    + PERF_REGS_VERSION_X86_64 = 2UL,
    +};
    +
    +#ifdef CONFIG_X86_32
    +#include "perf_regs_32.h"
    +#else
    +#include "perf_regs_64.h"
    +#endif
    +
    +#endif /* _ASM_X86_PERF_REGS_H */
    diff --git a/arch/x86/include/asm/perf_regs_32.h b/arch/x86/include/asm/perf_regs_32.h
    new file mode 100644
    index 0000000..3c5aa80
    --- /dev/null
    +++ b/arch/x86/include/asm/perf_regs_32.h
    @@ -0,0 +1,84 @@
    +#ifndef _ASM_X86_PERF_REGS_32_H
    +#define _ASM_X86_PERF_REGS_32_H
    +
    +enum perf_event_x86_32_regs {
    + PERF_X86_32_REG_EAX,
    + PERF_X86_32_REG_EBX,
    + PERF_X86_32_REG_ECX,
    + PERF_X86_32_REG_EDX,
    + PERF_X86_32_REG_ESI,
    + PERF_X86_32_REG_EDI,
    + PERF_X86_32_REG_EBP,
    + PERF_X86_32_REG_ESP,
    + PERF_X86_32_REG_EIP,
    + PERF_X86_32_REG_FLAGS,
    + PERF_X86_32_REG_CS,
    + PERF_X86_32_REG_DS,
    + PERF_X86_32_REG_ES,
    + PERF_X86_32_REG_FS,
    + PERF_X86_32_REG_GS,
    +
    + /* Non ABI */
    + PERF_X86_32_REG_MAX,
    + PERF_REG_IP = PERF_X86_32_REG_EIP,
    + PERF_REG_SP = PERF_X86_32_REG_ESP,
    +};
    +
    +#ifdef __KERNEL__
    +
    +#define PERF_X86_32_REG_RESERVED (~((1ULL << PERF_X86_32_REG_MAX) - 1ULL))
    +
    +static inline u64 perf_reg_version(void)
    +{
    + return PERF_REGS_VERSION_X86_32;
    +}
    +
    +static inline int perf_reg_validate(u64 mask)
    +{
    + if (mask & PERF_X86_32_REG_RESERVED)
    + return -EINVAL;
    +
    + return 0;
    +}
    +
    +static inline u64 perf_reg_value(struct pt_regs *regs, int idx)
    +{
    + switch (idx) {
    + case PERF_X86_32_REG_EAX:
    + return regs->ax;
    + case PERF_X86_32_REG_EBX:
    + return regs->bx;
    + case PERF_X86_32_REG_ECX:
    + return regs->cx;
    + case PERF_X86_32_REG_EDX:
    + return regs->dx;
    + case PERF_X86_32_REG_ESI:
    + return regs->si;
    + case PERF_X86_32_REG_EDI:
    + return regs->di;
    + case PERF_X86_32_REG_EBP:
    + return regs->bp;
    + case PERF_X86_32_REG_ESP:
    + return regs->sp;
    + case PERF_X86_32_REG_EIP:
    + return regs->ip;
    + case PERF_X86_32_REG_FLAGS:
    + return regs->flags;
    + case PERF_X86_32_REG_CS:
    + return regs->cs;
    + case PERF_X86_32_REG_DS:
    + return regs->ds;
    + case PERF_X86_32_REG_ES:
    + return regs->es;
    + case PERF_X86_32_REG_FS:
    + return regs->fs;
    + case PERF_X86_32_REG_GS:
    + return regs->gs;
    + }
    +
    + return 0;
    +}
    +
    +#endif /* __KERNEL__ */
    +
    +#endif /* _ASM_X86_PERF_REGS_32_H */
    diff --git a/arch/x86/include/asm/perf_regs_64.h b/arch/x86/include/asm/perf_regs_64.h
    new file mode 100644
    index 0000000..d775213
    --- /dev/null
    +++ b/arch/x86/include/asm/perf_regs_64.h
    @@ -0,0 +1,101 @@
    +#ifndef _ASM_X86_PERF_REGS_64_H
    +#define _ASM_X86_PERF_REGS_64_H
    +
    +#define PERF_X86_64_REG_VERSION 1ULL
    +
    +enum perf_event_x86_64_regs {
    + PERF_X86_64_REG_RAX,
    + PERF_X86_64_REG_RBX,
    + PERF_X86_64_REG_RCX,
    + PERF_X86_64_REG_RDX,
    + PERF_X86_64_REG_RSI,
    + PERF_X86_64_REG_RDI,
    + PERF_X86_64_REG_R8,
    + PERF_X86_64_REG_R9,
    + PERF_X86_64_REG_R10,
    + PERF_X86_64_REG_R11,
    + PERF_X86_64_REG_R12,
    + PERF_X86_64_REG_R13,
    + PERF_X86_64_REG_R14,
    + PERF_X86_64_REG_R15,
    + PERF_X86_64_REG_RBP,
    + PERF_X86_64_REG_RSP,
    + PERF_X86_64_REG_RIP,
    + PERF_X86_64_REG_FLAGS,
    + PERF_X86_64_REG_CS,
    + PERF_X86_64_REG_SS,
    +
    + /* Non ABI */
    + PERF_X86_64_REG_MAX,
    + PERF_REG_IP = PERF_X86_64_REG_RIP,
    + PERF_REG_SP = PERF_X86_64_REG_RSP,
    +};
    +
    +#ifdef __KERNEL__
    +
    +#define PERF_X86_64_REG_RESERVED (~((1ULL << PERF_X86_64_REG_MAX) - 1ULL))
    +
    +static inline u64 perf_reg_version(void)
    +{
    + return PERF_REGS_VERSION_X86_64;
    +}
    +
    +static inline int perf_reg_validate(u64 mask)
    +{
    + if (mask & PERF_X86_64_REG_RESERVED)
    + return -EINVAL;
    +
    + return 0;
    +}
    +
    +static inline u64 perf_reg_value(struct pt_regs *regs, int idx)
    +{
    + switch (idx) {
    + case PERF_X86_64_REG_RAX:
    + return regs->ax;
    + case PERF_X86_64_REG_RBX:
    + return regs->bx;
    + case PERF_X86_64_REG_RCX:
    + return regs->cx;
    + case PERF_X86_64_REG_RDX:
    + return regs->dx;
    + case PERF_X86_64_REG_RSI:
    + return regs->si;
    + case PERF_X86_64_REG_RDI:
    + return regs->di;
    + case PERF_X86_64_REG_R8:
    + return regs->r8;
    + case PERF_X86_64_REG_R9:
    + return regs->r9;
    + case PERF_X86_64_REG_R10:
    + return regs->r10;
    + case PERF_X86_64_REG_R11:
    + return regs->r11;
    + case PERF_X86_64_REG_R12:
    + return regs->r12;
    + case PERF_X86_64_REG_R13:
    + return regs->r13;
    + case PERF_X86_64_REG_R14:
    + return regs->r14;
    + case PERF_X86_64_REG_R15:
    + return regs->r15;
    + case PERF_X86_64_REG_RBP:
    + return regs->bp;
    + case PERF_X86_64_REG_RSP:
    + return regs->sp;
    + case PERF_X86_64_REG_RIP:
    + return regs->ip;
    + case PERF_X86_64_REG_FLAGS:
    + return regs->flags;
    + case PERF_X86_64_REG_CS:
    + return regs->cs;
    + case PERF_X86_64_REG_SS:
    + return regs->ss;
    + }
    +
    + return 0;
    +}
    +
    +#endif /* __KERNEL__ */
    +
    +#endif /* _ASM_X86_PERF_REGS_64_H */
    diff --git a/include/asm-generic/perf_regs.h b/include/asm-generic/perf_regs.h
    new file mode 100644
    index 0000000..f616096
    --- /dev/null
    +++ b/include/asm-generic/perf_regs.h
    @@ -0,0 +1,23 @@
    +#ifndef __ASM_GENERIC_PERF_REGS_H
    +#define __ASM_GENERIC_PERF_REGS_H
    +
    +enum {
    + PERF_REGS_VERSION_NONE = 0UL,
    +};
    +
    +static inline int perf_reg_value(struct pt_regs *regs, int idx)
    +{
    + return 0;
    +}
    +
    +static inline int perf_reg_version(void)
    +{
    + return PERF_REGS_VERSION_NONE;
    +}
    +
    +static inline int perf_reg_validate(u64 mask)
    +{
    + return mask ? -ENOSYS : 0;
    +}
    +
    +#endif /* __ASM_GENERIC_PERF_REGS_H */
    --
    1.7.7.6


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