1 #include <linux/errno.h> 2 #include <linux/kernel.h> 3 #include <linux/sched.h> 4 #include <linux/perf_event.h> 5 #include <linux/bug.h> 6 #include <linux/stddef.h> 7 #include <asm/perf_regs.h> 8 #include <asm/ptrace.h> 9 10 #ifdef CONFIG_X86_32 11 #define PERF_REG_X86_MAX PERF_REG_X86_32_MAX 12 #else 13 #define PERF_REG_X86_MAX PERF_REG_X86_64_MAX 14 #endif 15 16 #define PT_REGS_OFFSET(id, r) [id] = offsetof(struct pt_regs, r) 17 18 static unsigned int pt_regs_offset[PERF_REG_X86_MAX] = { 19 PT_REGS_OFFSET(PERF_REG_X86_AX, ax), 20 PT_REGS_OFFSET(PERF_REG_X86_BX, bx), 21 PT_REGS_OFFSET(PERF_REG_X86_CX, cx), 22 PT_REGS_OFFSET(PERF_REG_X86_DX, dx), 23 PT_REGS_OFFSET(PERF_REG_X86_SI, si), 24 PT_REGS_OFFSET(PERF_REG_X86_DI, di), 25 PT_REGS_OFFSET(PERF_REG_X86_BP, bp), 26 PT_REGS_OFFSET(PERF_REG_X86_SP, sp), 27 PT_REGS_OFFSET(PERF_REG_X86_IP, ip), 28 PT_REGS_OFFSET(PERF_REG_X86_FLAGS, flags), 29 PT_REGS_OFFSET(PERF_REG_X86_CS, cs), 30 PT_REGS_OFFSET(PERF_REG_X86_SS, ss), 31 #ifdef CONFIG_X86_32 32 PT_REGS_OFFSET(PERF_REG_X86_DS, ds), 33 PT_REGS_OFFSET(PERF_REG_X86_ES, es), 34 PT_REGS_OFFSET(PERF_REG_X86_FS, fs), 35 PT_REGS_OFFSET(PERF_REG_X86_GS, gs), 36 #else 37 /* 38 * The pt_regs struct does not store 39 * ds, es, fs, gs in 64 bit mode. 40 */ 41 (unsigned int) -1, 42 (unsigned int) -1, 43 (unsigned int) -1, 44 (unsigned int) -1, 45 #endif 46 #ifdef CONFIG_X86_64 47 PT_REGS_OFFSET(PERF_REG_X86_R8, r8), 48 PT_REGS_OFFSET(PERF_REG_X86_R9, r9), 49 PT_REGS_OFFSET(PERF_REG_X86_R10, r10), 50 PT_REGS_OFFSET(PERF_REG_X86_R11, r11), 51 PT_REGS_OFFSET(PERF_REG_X86_R12, r12), 52 PT_REGS_OFFSET(PERF_REG_X86_R13, r13), 53 PT_REGS_OFFSET(PERF_REG_X86_R14, r14), 54 PT_REGS_OFFSET(PERF_REG_X86_R15, r15), 55 #endif 56 }; 57 58 u64 perf_reg_value(struct pt_regs *regs, int idx) 59 { 60 if (WARN_ON_ONCE(idx >= ARRAY_SIZE(pt_regs_offset))) 61 return 0; 62 63 return regs_get_register(regs, pt_regs_offset[idx]); 64 } 65 66 #define REG_RESERVED (~((1ULL << PERF_REG_X86_MAX) - 1ULL)) 67 68 #ifdef CONFIG_X86_32 69 int perf_reg_validate(u64 mask) 70 { 71 if (!mask || mask & REG_RESERVED) 72 return -EINVAL; 73 74 return 0; 75 } 76 77 u64 perf_reg_abi(struct task_struct *task) 78 { 79 return PERF_SAMPLE_REGS_ABI_32; 80 } 81 #else /* CONFIG_X86_64 */ 82 #define REG_NOSUPPORT ((1ULL << PERF_REG_X86_DS) | \ 83 (1ULL << PERF_REG_X86_ES) | \ 84 (1ULL << PERF_REG_X86_FS) | \ 85 (1ULL << PERF_REG_X86_GS)) 86 87 int perf_reg_validate(u64 mask) 88 { 89 if (!mask || mask & REG_RESERVED) 90 return -EINVAL; 91 92 if (mask & REG_NOSUPPORT) 93 return -EINVAL; 94 95 return 0; 96 } 97 98 u64 perf_reg_abi(struct task_struct *task) 99 { 100 if (test_tsk_thread_flag(task, TIF_IA32)) 101 return PERF_SAMPLE_REGS_ABI_32; 102 else 103 return PERF_SAMPLE_REGS_ABI_64; 104 } 105 #endif /* CONFIG_X86_32 */ 106