| Jiri Olsa | c5e6319 | 2012-08-07 15:20:36 +0200 | [diff] [blame^] | 1 | #include <linux/errno.h> |
| 2 | #include <linux/kernel.h> |
| 3 | #include <linux/bug.h> |
| 4 | #include <linux/stddef.h> |
| 5 | #include <asm/perf_regs.h> |
| 6 | #include <asm/ptrace.h> |
| 7 | |
| 8 | #ifdef CONFIG_X86_32 |
| 9 | #define PERF_REG_X86_MAX PERF_REG_X86_32_MAX |
| 10 | #else |
| 11 | #define PERF_REG_X86_MAX PERF_REG_X86_64_MAX |
| 12 | #endif |
| 13 | |
| 14 | #define PT_REGS_OFFSET(id, r) [id] = offsetof(struct pt_regs, r) |
| 15 | |
| 16 | static unsigned int pt_regs_offset[PERF_REG_X86_MAX] = { |
| 17 | PT_REGS_OFFSET(PERF_REG_X86_AX, ax), |
| 18 | PT_REGS_OFFSET(PERF_REG_X86_BX, bx), |
| 19 | PT_REGS_OFFSET(PERF_REG_X86_CX, cx), |
| 20 | PT_REGS_OFFSET(PERF_REG_X86_DX, dx), |
| 21 | PT_REGS_OFFSET(PERF_REG_X86_SI, si), |
| 22 | PT_REGS_OFFSET(PERF_REG_X86_DI, di), |
| 23 | PT_REGS_OFFSET(PERF_REG_X86_BP, bp), |
| 24 | PT_REGS_OFFSET(PERF_REG_X86_SP, sp), |
| 25 | PT_REGS_OFFSET(PERF_REG_X86_IP, ip), |
| 26 | PT_REGS_OFFSET(PERF_REG_X86_FLAGS, flags), |
| 27 | PT_REGS_OFFSET(PERF_REG_X86_CS, cs), |
| 28 | PT_REGS_OFFSET(PERF_REG_X86_SS, ss), |
| 29 | #ifdef CONFIG_X86_32 |
| 30 | PT_REGS_OFFSET(PERF_REG_X86_DS, ds), |
| 31 | PT_REGS_OFFSET(PERF_REG_X86_ES, es), |
| 32 | PT_REGS_OFFSET(PERF_REG_X86_FS, fs), |
| 33 | PT_REGS_OFFSET(PERF_REG_X86_GS, gs), |
| 34 | #else |
| 35 | /* |
| 36 | * The pt_regs struct does not store |
| 37 | * ds, es, fs, gs in 64 bit mode. |
| 38 | */ |
| 39 | (unsigned int) -1, |
| 40 | (unsigned int) -1, |
| 41 | (unsigned int) -1, |
| 42 | (unsigned int) -1, |
| 43 | #endif |
| 44 | #ifdef CONFIG_X86_64 |
| 45 | PT_REGS_OFFSET(PERF_REG_X86_R8, r8), |
| 46 | PT_REGS_OFFSET(PERF_REG_X86_R9, r9), |
| 47 | PT_REGS_OFFSET(PERF_REG_X86_R10, r10), |
| 48 | PT_REGS_OFFSET(PERF_REG_X86_R11, r11), |
| 49 | PT_REGS_OFFSET(PERF_REG_X86_R12, r12), |
| 50 | PT_REGS_OFFSET(PERF_REG_X86_R13, r13), |
| 51 | PT_REGS_OFFSET(PERF_REG_X86_R14, r14), |
| 52 | PT_REGS_OFFSET(PERF_REG_X86_R15, r15), |
| 53 | #endif |
| 54 | }; |
| 55 | |
| 56 | u64 perf_reg_value(struct pt_regs *regs, int idx) |
| 57 | { |
| 58 | if (WARN_ON_ONCE(idx > ARRAY_SIZE(pt_regs_offset))) |
| 59 | return 0; |
| 60 | |
| 61 | return regs_get_register(regs, pt_regs_offset[idx]); |
| 62 | } |
| 63 | |
| 64 | #define REG_RESERVED (~((1ULL << PERF_REG_X86_MAX) - 1ULL)) |
| 65 | |
| 66 | #ifdef CONFIG_X86_32 |
| 67 | int perf_reg_validate(u64 mask) |
| 68 | { |
| 69 | if (!mask || mask & REG_RESERVED) |
| 70 | return -EINVAL; |
| 71 | |
| 72 | return 0; |
| 73 | } |
| 74 | #else /* CONFIG_X86_64 */ |
| 75 | #define REG_NOSUPPORT ((1ULL << PERF_REG_X86_DS) | \ |
| 76 | (1ULL << PERF_REG_X86_ES) | \ |
| 77 | (1ULL << PERF_REG_X86_FS) | \ |
| 78 | (1ULL << PERF_REG_X86_GS)) |
| 79 | |
| 80 | int perf_reg_validate(u64 mask) |
| 81 | { |
| 82 | if (!mask || mask & REG_RESERVED) |
| 83 | return -EINVAL; |
| 84 | |
| 85 | if (mask & REG_NOSUPPORT) |
| 86 | return -EINVAL; |
| 87 | |
| 88 | return 0; |
| 89 | } |
| 90 | #endif /* CONFIG_X86_32 */ |