| #include <linux/errno.h> |
| #include <linux/kernel.h> |
| #include <linux/perf_event.h> |
| #include <linux/bug.h> |
| |
| #include <asm/compat.h> |
| #include <asm/perf_regs.h> |
| #include <asm/ptrace.h> |
| |
| u64 perf_reg_value(struct pt_regs *regs, int idx) |
| { |
| if (WARN_ON_ONCE((u32)idx >= PERF_REG_ARM64_MAX)) |
| return 0; |
| |
| /* |
| * Compat (i.e. 32 bit) mode: |
| * - PC has been set in the pt_regs struct in kernel_entry, |
| * - Handle SP and LR here. |
| */ |
| if (compat_user_mode(regs)) { |
| if ((u32)idx == PERF_REG_ARM64_SP) |
| return regs->compat_sp; |
| if ((u32)idx == PERF_REG_ARM64_LR) |
| return regs->compat_lr; |
| } |
| |
| if ((u32)idx == PERF_REG_ARM64_SP) |
| return regs->sp; |
| |
| if ((u32)idx == PERF_REG_ARM64_PC) |
| return regs->pc; |
| |
| return regs->regs[idx]; |
| } |
| |
| #define REG_RESERVED (~((1ULL << PERF_REG_ARM64_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 (is_compat_thread(task_thread_info(task))) |
| return PERF_SAMPLE_REGS_ABI_32; |
| else |
| return PERF_SAMPLE_REGS_ABI_64; |
| } |
