| /* |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| * |
| * Copyright (C) 1992 Ross Biro |
| * Copyright (C) Linus Torvalds |
| * Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle |
| * Copyright (C) 1996 David S. Miller |
| * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com |
| * Copyright (C) 1999 MIPS Technologies, Inc. |
| * Copyright (C) 2000 Ulf Carlsson |
| * |
| * At this time Linux/MIPS64 only supports syscall tracing, even for 32-bit |
| * binaries. |
| */ |
| #include <linux/compiler.h> |
| #include <linux/context_tracking.h> |
| #include <linux/elf.h> |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/sched/task_stack.h> |
| #include <linux/mm.h> |
| #include <linux/errno.h> |
| #include <linux/ptrace.h> |
| #include <linux/regset.h> |
| #include <linux/smp.h> |
| #include <linux/security.h> |
| #include <linux/stddef.h> |
| #include <linux/audit.h> |
| #include <linux/seccomp.h> |
| #include <linux/ftrace.h> |
| |
| #include <asm/byteorder.h> |
| #include <asm/cpu.h> |
| #include <asm/cpu-info.h> |
| #include <asm/dsp.h> |
| #include <asm/fpu.h> |
| #include <asm/mipsregs.h> |
| #include <asm/mipsmtregs.h> |
| #include <asm/page.h> |
| #include <asm/processor.h> |
| #include <asm/syscall.h> |
| #include <linux/uaccess.h> |
| #include <asm/bootinfo.h> |
| #include <asm/reg.h> |
| |
| #define CREATE_TRACE_POINTS |
| #include <trace/events/syscalls.h> |
| |
| /* |
| * Called by kernel/ptrace.c when detaching.. |
| * |
| * Make sure single step bits etc are not set. |
| */ |
| void ptrace_disable(struct task_struct *child) |
| { |
| /* Don't load the watchpoint registers for the ex-child. */ |
| clear_tsk_thread_flag(child, TIF_LOAD_WATCH); |
| } |
| |
| /* |
| * Read a general register set. We always use the 64-bit format, even |
| * for 32-bit kernels and for 32-bit processes on a 64-bit kernel. |
| * Registers are sign extended to fill the available space. |
| */ |
| int ptrace_getregs(struct task_struct *child, struct user_pt_regs __user *data) |
| { |
| struct pt_regs *regs; |
| int i; |
| |
| if (!access_ok(data, 38 * 8)) |
| return -EIO; |
| |
| regs = task_pt_regs(child); |
| |
| for (i = 0; i < 32; i++) |
| __put_user((long)regs->regs[i], (__s64 __user *)&data->regs[i]); |
| __put_user((long)regs->lo, (__s64 __user *)&data->lo); |
| __put_user((long)regs->hi, (__s64 __user *)&data->hi); |
| __put_user((long)regs->cp0_epc, (__s64 __user *)&data->cp0_epc); |
| __put_user((long)regs->cp0_badvaddr, (__s64 __user *)&data->cp0_badvaddr); |
| __put_user((long)regs->cp0_status, (__s64 __user *)&data->cp0_status); |
| __put_user((long)regs->cp0_cause, (__s64 __user *)&data->cp0_cause); |
| |
| return 0; |
| } |
| |
| /* |
| * Write a general register set. As for PTRACE_GETREGS, we always use |
| * the 64-bit format. On a 32-bit kernel only the lower order half |
| * (according to endianness) will be used. |
| */ |
| int ptrace_setregs(struct task_struct *child, struct user_pt_regs __user *data) |
| { |
| struct pt_regs *regs; |
| int i; |
| |
| if (!access_ok(data, 38 * 8)) |
| return -EIO; |
| |
| regs = task_pt_regs(child); |
| |
| for (i = 0; i < 32; i++) |
| __get_user(regs->regs[i], (__s64 __user *)&data->regs[i]); |
| __get_user(regs->lo, (__s64 __user *)&data->lo); |
| __get_user(regs->hi, (__s64 __user *)&data->hi); |
| __get_user(regs->cp0_epc, (__s64 __user *)&data->cp0_epc); |
| |
| /* badvaddr, status, and cause may not be written. */ |
| |
| /* System call number may have been changed */ |
| mips_syscall_update_nr(child, regs); |
| |
| return 0; |
| } |
| |
| int ptrace_get_watch_regs(struct task_struct *child, |
| struct pt_watch_regs __user *addr) |
| { |
| enum pt_watch_style style; |
| int i; |
| |
| if (!cpu_has_watch || boot_cpu_data.watch_reg_use_cnt == 0) |
| return -EIO; |
| if (!access_ok(addr, sizeof(struct pt_watch_regs))) |
| return -EIO; |
| |
| #ifdef CONFIG_32BIT |
| style = pt_watch_style_mips32; |
| #define WATCH_STYLE mips32 |
| #else |
| style = pt_watch_style_mips64; |
| #define WATCH_STYLE mips64 |
| #endif |
| |
| __put_user(style, &addr->style); |
| __put_user(boot_cpu_data.watch_reg_use_cnt, |
| &addr->WATCH_STYLE.num_valid); |
| for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) { |
| __put_user(child->thread.watch.mips3264.watchlo[i], |
| &addr->WATCH_STYLE.watchlo[i]); |
| __put_user(child->thread.watch.mips3264.watchhi[i] & |
| (MIPS_WATCHHI_MASK | MIPS_WATCHHI_IRW), |
| &addr->WATCH_STYLE.watchhi[i]); |
| __put_user(boot_cpu_data.watch_reg_masks[i], |
| &addr->WATCH_STYLE.watch_masks[i]); |
| } |
| for (; i < 8; i++) { |
| __put_user(0, &addr->WATCH_STYLE.watchlo[i]); |
| __put_user(0, &addr->WATCH_STYLE.watchhi[i]); |
| __put_user(0, &addr->WATCH_STYLE.watch_masks[i]); |
| } |
| |
| return 0; |
| } |
| |
| int ptrace_set_watch_regs(struct task_struct *child, |
| struct pt_watch_regs __user *addr) |
| { |
| int i; |
| int watch_active = 0; |
| unsigned long lt[NUM_WATCH_REGS]; |
| u16 ht[NUM_WATCH_REGS]; |
| |
| if (!cpu_has_watch || boot_cpu_data.watch_reg_use_cnt == 0) |
| return -EIO; |
| if (!access_ok(addr, sizeof(struct pt_watch_regs))) |
| return -EIO; |
| /* Check the values. */ |
| for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) { |
| __get_user(lt[i], &addr->WATCH_STYLE.watchlo[i]); |
| #ifdef CONFIG_32BIT |
| if (lt[i] & __UA_LIMIT) |
| return -EINVAL; |
| #else |
| if (test_tsk_thread_flag(child, TIF_32BIT_ADDR)) { |
| if (lt[i] & 0xffffffff80000000UL) |
| return -EINVAL; |
| } else { |
| if (lt[i] & __UA_LIMIT) |
| return -EINVAL; |
| } |
| #endif |
| __get_user(ht[i], &addr->WATCH_STYLE.watchhi[i]); |
| if (ht[i] & ~MIPS_WATCHHI_MASK) |
| return -EINVAL; |
| } |
| /* Install them. */ |
| for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) { |
| if (lt[i] & MIPS_WATCHLO_IRW) |
| watch_active = 1; |
| child->thread.watch.mips3264.watchlo[i] = lt[i]; |
| /* Set the G bit. */ |
| child->thread.watch.mips3264.watchhi[i] = ht[i]; |
| } |
| |
| if (watch_active) |
| set_tsk_thread_flag(child, TIF_LOAD_WATCH); |
| else |
| clear_tsk_thread_flag(child, TIF_LOAD_WATCH); |
| |
| return 0; |
| } |
| |
| /* regset get/set implementations */ |
| |
| #if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32) |
| |
| static int gpr32_get(struct task_struct *target, |
| const struct user_regset *regset, |
| struct membuf to) |
| { |
| struct pt_regs *regs = task_pt_regs(target); |
| u32 uregs[ELF_NGREG] = {}; |
| |
| mips_dump_regs32(uregs, regs); |
| return membuf_write(&to, uregs, sizeof(uregs)); |
| } |
| |
| static int gpr32_set(struct task_struct *target, |
| const struct user_regset *regset, |
| unsigned int pos, unsigned int count, |
| const void *kbuf, const void __user *ubuf) |
| { |
| struct pt_regs *regs = task_pt_regs(target); |
| u32 uregs[ELF_NGREG]; |
| unsigned start, num_regs, i; |
| int err; |
| |
| start = pos / sizeof(u32); |
| num_regs = count / sizeof(u32); |
| |
| if (start + num_regs > ELF_NGREG) |
| return -EIO; |
| |
| err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0, |
| sizeof(uregs)); |
| if (err) |
| return err; |
| |
| for (i = start; i < num_regs; i++) { |
| /* |
| * Cast all values to signed here so that if this is a 64-bit |
| * kernel, the supplied 32-bit values will be sign extended. |
| */ |
| switch (i) { |
| case MIPS32_EF_R1 ... MIPS32_EF_R25: |
| /* k0/k1 are ignored. */ |
| case MIPS32_EF_R28 ... MIPS32_EF_R31: |
| regs->regs[i - MIPS32_EF_R0] = (s32)uregs[i]; |
| break; |
| case MIPS32_EF_LO: |
| regs->lo = (s32)uregs[i]; |
| break; |
| case MIPS32_EF_HI: |
| regs->hi = (s32)uregs[i]; |
| break; |
| case MIPS32_EF_CP0_EPC: |
| regs->cp0_epc = (s32)uregs[i]; |
| break; |
| } |
| } |
| |
| /* System call number may have been changed */ |
| mips_syscall_update_nr(target, regs); |
| |
| return 0; |
| } |
| |
| #endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */ |
| |
| #ifdef CONFIG_64BIT |
| |
| static int gpr64_get(struct task_struct *target, |
| const struct user_regset *regset, |
| struct membuf to) |
| { |
| struct pt_regs *regs = task_pt_regs(target); |
| u64 uregs[ELF_NGREG] = {}; |
| |
| mips_dump_regs64(uregs, regs); |
| return membuf_write(&to, uregs, sizeof(uregs)); |
| } |
| |
| static int gpr64_set(struct task_struct *target, |
| const struct user_regset *regset, |
| unsigned int pos, unsigned int count, |
| const void *kbuf, const void __user *ubuf) |
| { |
| struct pt_regs *regs = task_pt_regs(target); |
| u64 uregs[ELF_NGREG]; |
| unsigned start, num_regs, i; |
| int err; |
| |
| start = pos / sizeof(u64); |
| num_regs = count / sizeof(u64); |
| |
| if (start + num_regs > ELF_NGREG) |
| return -EIO; |
| |
| err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0, |
| sizeof(uregs)); |
| if (err) |
| return err; |
| |
| for (i = start; i < num_regs; i++) { |
| switch (i) { |
| case MIPS64_EF_R1 ... MIPS64_EF_R25: |
| /* k0/k1 are ignored. */ |
| case MIPS64_EF_R28 ... MIPS64_EF_R31: |
| regs->regs[i - MIPS64_EF_R0] = uregs[i]; |
| break; |
| case MIPS64_EF_LO: |
| regs->lo = uregs[i]; |
| break; |
| case MIPS64_EF_HI: |
| regs->hi = uregs[i]; |
| break; |
| case MIPS64_EF_CP0_EPC: |
| regs->cp0_epc = uregs[i]; |
| break; |
| } |
| } |
| |
| /* System call number may have been changed */ |
| mips_syscall_update_nr(target, regs); |
| |
| return 0; |
| } |
| |
| #endif /* CONFIG_64BIT */ |
| |
| |
| #ifdef CONFIG_MIPS_FP_SUPPORT |
| |
| /* |
| * Poke at FCSR according to its mask. Set the Cause bits even |
| * if a corresponding Enable bit is set. This will be noticed at |
| * the time the thread is switched to and SIGFPE thrown accordingly. |
| */ |
| static void ptrace_setfcr31(struct task_struct *child, u32 value) |
| { |
| u32 fcr31; |
| u32 mask; |
| |
| fcr31 = child->thread.fpu.fcr31; |
| mask = boot_cpu_data.fpu_msk31; |
| child->thread.fpu.fcr31 = (value & ~mask) | (fcr31 & mask); |
| } |
| |
| int ptrace_getfpregs(struct task_struct *child, __u32 __user *data) |
| { |
| int i; |
| |
| if (!access_ok(data, 33 * 8)) |
| return -EIO; |
| |
| if (tsk_used_math(child)) { |
| union fpureg *fregs = get_fpu_regs(child); |
| for (i = 0; i < 32; i++) |
| __put_user(get_fpr64(&fregs[i], 0), |
| i + (__u64 __user *)data); |
| } else { |
| for (i = 0; i < 32; i++) |
| __put_user((__u64) -1, i + (__u64 __user *) data); |
| } |
| |
| __put_user(child->thread.fpu.fcr31, data + 64); |
| __put_user(boot_cpu_data.fpu_id, data + 65); |
| |
| return 0; |
| } |
| |
| int ptrace_setfpregs(struct task_struct *child, __u32 __user *data) |
| { |
| union fpureg *fregs; |
| u64 fpr_val; |
| u32 value; |
| int i; |
| |
| if (!access_ok(data, 33 * 8)) |
| return -EIO; |
| |
| init_fp_ctx(child); |
| fregs = get_fpu_regs(child); |
| |
| for (i = 0; i < 32; i++) { |
| __get_user(fpr_val, i + (__u64 __user *)data); |
| set_fpr64(&fregs[i], 0, fpr_val); |
| } |
| |
| __get_user(value, data + 64); |
| ptrace_setfcr31(child, value); |
| |
| /* FIR may not be written. */ |
| |
| return 0; |
| } |
| |
| /* |
| * Copy the floating-point context to the supplied NT_PRFPREG buffer, |
| * !CONFIG_CPU_HAS_MSA variant. FP context's general register slots |
| * correspond 1:1 to buffer slots. Only general registers are copied. |
| */ |
| static void fpr_get_fpa(struct task_struct *target, |
| struct membuf *to) |
| { |
| membuf_write(to, &target->thread.fpu, |
| NUM_FPU_REGS * sizeof(elf_fpreg_t)); |
| } |
| |
| /* |
| * Copy the floating-point context to the supplied NT_PRFPREG buffer, |
| * CONFIG_CPU_HAS_MSA variant. Only lower 64 bits of FP context's |
| * general register slots are copied to buffer slots. Only general |
| * registers are copied. |
| */ |
| static void fpr_get_msa(struct task_struct *target, struct membuf *to) |
| { |
| unsigned int i; |
| |
| BUILD_BUG_ON(sizeof(u64) != sizeof(elf_fpreg_t)); |
| for (i = 0; i < NUM_FPU_REGS; i++) |
| membuf_store(to, get_fpr64(&target->thread.fpu.fpr[i], 0)); |
| } |
| |
| /* |
| * Copy the floating-point context to the supplied NT_PRFPREG buffer. |
| * Choose the appropriate helper for general registers, and then copy |
| * the FCSR and FIR registers separately. |
| */ |
| static int fpr_get(struct task_struct *target, |
| const struct user_regset *regset, |
| struct membuf to) |
| { |
| if (sizeof(target->thread.fpu.fpr[0]) == sizeof(elf_fpreg_t)) |
| fpr_get_fpa(target, &to); |
| else |
| fpr_get_msa(target, &to); |
| |
| membuf_write(&to, &target->thread.fpu.fcr31, sizeof(u32)); |
| membuf_write(&to, &boot_cpu_data.fpu_id, sizeof(u32)); |
| return 0; |
| } |
| |
| /* |
| * Copy the supplied NT_PRFPREG buffer to the floating-point context, |
| * !CONFIG_CPU_HAS_MSA variant. Buffer slots correspond 1:1 to FP |
| * context's general register slots. Only general registers are copied. |
| */ |
| static int fpr_set_fpa(struct task_struct *target, |
| unsigned int *pos, unsigned int *count, |
| const void **kbuf, const void __user **ubuf) |
| { |
| return user_regset_copyin(pos, count, kbuf, ubuf, |
| &target->thread.fpu, |
| 0, NUM_FPU_REGS * sizeof(elf_fpreg_t)); |
| } |
| |
| /* |
| * Copy the supplied NT_PRFPREG buffer to the floating-point context, |
| * CONFIG_CPU_HAS_MSA variant. Buffer slots are copied to lower 64 |
| * bits only of FP context's general register slots. Only general |
| * registers are copied. |
| */ |
| static int fpr_set_msa(struct task_struct *target, |
| unsigned int *pos, unsigned int *count, |
| const void **kbuf, const void __user **ubuf) |
| { |
| unsigned int i; |
| u64 fpr_val; |
| int err; |
| |
| BUILD_BUG_ON(sizeof(fpr_val) != sizeof(elf_fpreg_t)); |
| for (i = 0; i < NUM_FPU_REGS && *count > 0; i++) { |
| err = user_regset_copyin(pos, count, kbuf, ubuf, |
| &fpr_val, i * sizeof(elf_fpreg_t), |
| (i + 1) * sizeof(elf_fpreg_t)); |
| if (err) |
| return err; |
| set_fpr64(&target->thread.fpu.fpr[i], 0, fpr_val); |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Copy the supplied NT_PRFPREG buffer to the floating-point context. |
| * Choose the appropriate helper for general registers, and then copy |
| * the FCSR register separately. Ignore the incoming FIR register |
| * contents though, as the register is read-only. |
| * |
| * We optimize for the case where `count % sizeof(elf_fpreg_t) == 0', |
| * which is supposed to have been guaranteed by the kernel before |
| * calling us, e.g. in `ptrace_regset'. We enforce that requirement, |
| * so that we can safely avoid preinitializing temporaries for |
| * partial register writes. |
| */ |
| static int fpr_set(struct task_struct *target, |
| const struct user_regset *regset, |
| unsigned int pos, unsigned int count, |
| const void *kbuf, const void __user *ubuf) |
| { |
| const int fcr31_pos = NUM_FPU_REGS * sizeof(elf_fpreg_t); |
| const int fir_pos = fcr31_pos + sizeof(u32); |
| u32 fcr31; |
| int err; |
| |
| BUG_ON(count % sizeof(elf_fpreg_t)); |
| |
| if (pos + count > sizeof(elf_fpregset_t)) |
| return -EIO; |
| |
| init_fp_ctx(target); |
| |
| if (sizeof(target->thread.fpu.fpr[0]) == sizeof(elf_fpreg_t)) |
| err = fpr_set_fpa(target, &pos, &count, &kbuf, &ubuf); |
| else |
| err = fpr_set_msa(target, &pos, &count, &kbuf, &ubuf); |
| if (err) |
| return err; |
| |
| if (count > 0) { |
| err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
| &fcr31, |
| fcr31_pos, fcr31_pos + sizeof(u32)); |
| if (err) |
| return err; |
| |
| ptrace_setfcr31(target, fcr31); |
| } |
| |
| if (count > 0) |
| err = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, |
| fir_pos, |
| fir_pos + sizeof(u32)); |
| |
| return err; |
| } |
| |
| /* Copy the FP mode setting to the supplied NT_MIPS_FP_MODE buffer. */ |
| static int fp_mode_get(struct task_struct *target, |
| const struct user_regset *regset, |
| struct membuf to) |
| { |
| return membuf_store(&to, (int)mips_get_process_fp_mode(target)); |
| } |
| |
| /* |
| * Copy the supplied NT_MIPS_FP_MODE buffer to the FP mode setting. |
| * |
| * We optimize for the case where `count % sizeof(int) == 0', which |
| * is supposed to have been guaranteed by the kernel before calling |
| * us, e.g. in `ptrace_regset'. We enforce that requirement, so |
| * that we can safely avoid preinitializing temporaries for partial |
| * mode writes. |
| */ |
| static int fp_mode_set(struct task_struct *target, |
| const struct user_regset *regset, |
| unsigned int pos, unsigned int count, |
| const void *kbuf, const void __user *ubuf) |
| { |
| int fp_mode; |
| int err; |
| |
| BUG_ON(count % sizeof(int)); |
| |
| if (pos + count > sizeof(fp_mode)) |
| return -EIO; |
| |
| err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &fp_mode, 0, |
| sizeof(fp_mode)); |
| if (err) |
| return err; |
| |
| if (count > 0) |
| err = mips_set_process_fp_mode(target, fp_mode); |
| |
| return err; |
| } |
| |
| #endif /* CONFIG_MIPS_FP_SUPPORT */ |
| |
| #ifdef CONFIG_CPU_HAS_MSA |
| |
| struct msa_control_regs { |
| unsigned int fir; |
| unsigned int fcsr; |
| unsigned int msair; |
| unsigned int msacsr; |
| }; |
| |
| static void copy_pad_fprs(struct task_struct *target, |
| const struct user_regset *regset, |
| struct membuf *to, |
| unsigned int live_sz) |
| { |
| int i, j; |
| unsigned long long fill = ~0ull; |
| unsigned int cp_sz, pad_sz; |
| |
| cp_sz = min(regset->size, live_sz); |
| pad_sz = regset->size - cp_sz; |
| WARN_ON(pad_sz % sizeof(fill)); |
| |
| for (i = 0; i < NUM_FPU_REGS; i++) { |
| membuf_write(to, &target->thread.fpu.fpr[i], cp_sz); |
| for (j = 0; j < (pad_sz / sizeof(fill)); j++) |
| membuf_store(to, fill); |
| } |
| } |
| |
| static int msa_get(struct task_struct *target, |
| const struct user_regset *regset, |
| struct membuf to) |
| { |
| const unsigned int wr_size = NUM_FPU_REGS * regset->size; |
| const struct msa_control_regs ctrl_regs = { |
| .fir = boot_cpu_data.fpu_id, |
| .fcsr = target->thread.fpu.fcr31, |
| .msair = boot_cpu_data.msa_id, |
| .msacsr = target->thread.fpu.msacsr, |
| }; |
| |
| if (!tsk_used_math(target)) { |
| /* The task hasn't used FP or MSA, fill with 0xff */ |
| copy_pad_fprs(target, regset, &to, 0); |
| } else if (!test_tsk_thread_flag(target, TIF_MSA_CTX_LIVE)) { |
| /* Copy scalar FP context, fill the rest with 0xff */ |
| copy_pad_fprs(target, regset, &to, 8); |
| } else if (sizeof(target->thread.fpu.fpr[0]) == regset->size) { |
| /* Trivially copy the vector registers */ |
| membuf_write(&to, &target->thread.fpu.fpr, wr_size); |
| } else { |
| /* Copy as much context as possible, fill the rest with 0xff */ |
| copy_pad_fprs(target, regset, &to, |
| sizeof(target->thread.fpu.fpr[0])); |
| } |
| |
| return membuf_write(&to, &ctrl_regs, sizeof(ctrl_regs)); |
| } |
| |
| static int msa_set(struct task_struct *target, |
| const struct user_regset *regset, |
| unsigned int pos, unsigned int count, |
| const void *kbuf, const void __user *ubuf) |
| { |
| const unsigned int wr_size = NUM_FPU_REGS * regset->size; |
| struct msa_control_regs ctrl_regs; |
| unsigned int cp_sz; |
| int i, err, start; |
| |
| init_fp_ctx(target); |
| |
| if (sizeof(target->thread.fpu.fpr[0]) == regset->size) { |
| /* Trivially copy the vector registers */ |
| err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
| &target->thread.fpu.fpr, |
| 0, wr_size); |
| } else { |
| /* Copy as much context as possible */ |
| cp_sz = min_t(unsigned int, regset->size, |
| sizeof(target->thread.fpu.fpr[0])); |
| |
| i = start = err = 0; |
| for (; i < NUM_FPU_REGS; i++, start += regset->size) { |
| err |= user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
| &target->thread.fpu.fpr[i], |
| start, start + cp_sz); |
| } |
| } |
| |
| if (!err) |
| err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ctrl_regs, |
| wr_size, wr_size + sizeof(ctrl_regs)); |
| if (!err) { |
| target->thread.fpu.fcr31 = ctrl_regs.fcsr & ~FPU_CSR_ALL_X; |
| target->thread.fpu.msacsr = ctrl_regs.msacsr & ~MSA_CSR_CAUSEF; |
| } |
| |
| return err; |
| } |
| |
| #endif /* CONFIG_CPU_HAS_MSA */ |
| |
| #if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32) |
| |
| /* |
| * Copy the DSP context to the supplied 32-bit NT_MIPS_DSP buffer. |
| */ |
| static int dsp32_get(struct task_struct *target, |
| const struct user_regset *regset, |
| struct membuf to) |
| { |
| u32 dspregs[NUM_DSP_REGS + 1]; |
| unsigned int i; |
| |
| BUG_ON(to.left % sizeof(u32)); |
| |
| if (!cpu_has_dsp) |
| return -EIO; |
| |
| for (i = 0; i < NUM_DSP_REGS; i++) |
| dspregs[i] = target->thread.dsp.dspr[i]; |
| dspregs[NUM_DSP_REGS] = target->thread.dsp.dspcontrol; |
| return membuf_write(&to, dspregs, sizeof(dspregs)); |
| } |
| |
| /* |
| * Copy the supplied 32-bit NT_MIPS_DSP buffer to the DSP context. |
| */ |
| static int dsp32_set(struct task_struct *target, |
| const struct user_regset *regset, |
| unsigned int pos, unsigned int count, |
| const void *kbuf, const void __user *ubuf) |
| { |
| unsigned int start, num_regs, i; |
| u32 dspregs[NUM_DSP_REGS + 1]; |
| int err; |
| |
| BUG_ON(count % sizeof(u32)); |
| |
| if (!cpu_has_dsp) |
| return -EIO; |
| |
| start = pos / sizeof(u32); |
| num_regs = count / sizeof(u32); |
| |
| if (start + num_regs > NUM_DSP_REGS + 1) |
| return -EIO; |
| |
| err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, dspregs, 0, |
| sizeof(dspregs)); |
| if (err) |
| return err; |
| |
| for (i = start; i < num_regs; i++) |
| switch (i) { |
| case 0 ... NUM_DSP_REGS - 1: |
| target->thread.dsp.dspr[i] = (s32)dspregs[i]; |
| break; |
| case NUM_DSP_REGS: |
| target->thread.dsp.dspcontrol = (s32)dspregs[i]; |
| break; |
| } |
| |
| return 0; |
| } |
| |
| #endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */ |
| |
| #ifdef CONFIG_64BIT |
| |
| /* |
| * Copy the DSP context to the supplied 64-bit NT_MIPS_DSP buffer. |
| */ |
| static int dsp64_get(struct task_struct *target, |
| const struct user_regset *regset, |
| struct membuf to) |
| { |
| u64 dspregs[NUM_DSP_REGS + 1]; |
| unsigned int i; |
| |
| BUG_ON(to.left % sizeof(u64)); |
| |
| if (!cpu_has_dsp) |
| return -EIO; |
| |
| for (i = 0; i < NUM_DSP_REGS; i++) |
| dspregs[i] = target->thread.dsp.dspr[i]; |
| dspregs[NUM_DSP_REGS] = target->thread.dsp.dspcontrol; |
| return membuf_write(&to, dspregs, sizeof(dspregs)); |
| } |
| |
| /* |
| * Copy the supplied 64-bit NT_MIPS_DSP buffer to the DSP context. |
| */ |
| static int dsp64_set(struct task_struct *target, |
| const struct user_regset *regset, |
| unsigned int pos, unsigned int count, |
| const void *kbuf, const void __user *ubuf) |
| { |
| unsigned int start, num_regs, i; |
| u64 dspregs[NUM_DSP_REGS + 1]; |
| int err; |
| |
| BUG_ON(count % sizeof(u64)); |
| |
| if (!cpu_has_dsp) |
| return -EIO; |
| |
| start = pos / sizeof(u64); |
| num_regs = count / sizeof(u64); |
| |
| if (start + num_regs > NUM_DSP_REGS + 1) |
| return -EIO; |
| |
| err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, dspregs, 0, |
| sizeof(dspregs)); |
| if (err) |
| return err; |
| |
| for (i = start; i < num_regs; i++) |
| switch (i) { |
| case 0 ... NUM_DSP_REGS - 1: |
| target->thread.dsp.dspr[i] = dspregs[i]; |
| break; |
| case NUM_DSP_REGS: |
| target->thread.dsp.dspcontrol = dspregs[i]; |
| break; |
| } |
| |
| return 0; |
| } |
| |
| #endif /* CONFIG_64BIT */ |
| |
| /* |
| * Determine whether the DSP context is present. |
| */ |
| static int dsp_active(struct task_struct *target, |
| const struct user_regset *regset) |
| { |
| return cpu_has_dsp ? NUM_DSP_REGS + 1 : -ENODEV; |
| } |
| |
| enum mips_regset { |
| REGSET_GPR, |
| REGSET_DSP, |
| #ifdef CONFIG_MIPS_FP_SUPPORT |
| REGSET_FPR, |
| REGSET_FP_MODE, |
| #endif |
| #ifdef CONFIG_CPU_HAS_MSA |
| REGSET_MSA, |
| #endif |
| }; |
| |
| struct pt_regs_offset { |
| const char *name; |
| int offset; |
| }; |
| |
| #define REG_OFFSET_NAME(reg, r) { \ |
| .name = #reg, \ |
| .offset = offsetof(struct pt_regs, r) \ |
| } |
| |
| #define REG_OFFSET_END { \ |
| .name = NULL, \ |
| .offset = 0 \ |
| } |
| |
| static const struct pt_regs_offset regoffset_table[] = { |
| REG_OFFSET_NAME(r0, regs[0]), |
| REG_OFFSET_NAME(r1, regs[1]), |
| REG_OFFSET_NAME(r2, regs[2]), |
| REG_OFFSET_NAME(r3, regs[3]), |
| REG_OFFSET_NAME(r4, regs[4]), |
| REG_OFFSET_NAME(r5, regs[5]), |
| REG_OFFSET_NAME(r6, regs[6]), |
| REG_OFFSET_NAME(r7, regs[7]), |
| REG_OFFSET_NAME(r8, regs[8]), |
| REG_OFFSET_NAME(r9, regs[9]), |
| REG_OFFSET_NAME(r10, regs[10]), |
| REG_OFFSET_NAME(r11, regs[11]), |
| REG_OFFSET_NAME(r12, regs[12]), |
| REG_OFFSET_NAME(r13, regs[13]), |
| REG_OFFSET_NAME(r14, regs[14]), |
| REG_OFFSET_NAME(r15, regs[15]), |
| REG_OFFSET_NAME(r16, regs[16]), |
| REG_OFFSET_NAME(r17, regs[17]), |
| REG_OFFSET_NAME(r18, regs[18]), |
| REG_OFFSET_NAME(r19, regs[19]), |
| REG_OFFSET_NAME(r20, regs[20]), |
| REG_OFFSET_NAME(r21, regs[21]), |
| REG_OFFSET_NAME(r22, regs[22]), |
| REG_OFFSET_NAME(r23, regs[23]), |
| REG_OFFSET_NAME(r24, regs[24]), |
| REG_OFFSET_NAME(r25, regs[25]), |
| REG_OFFSET_NAME(r26, regs[26]), |
| REG_OFFSET_NAME(r27, regs[27]), |
| REG_OFFSET_NAME(r28, regs[28]), |
| REG_OFFSET_NAME(r29, regs[29]), |
| REG_OFFSET_NAME(r30, regs[30]), |
| REG_OFFSET_NAME(r31, regs[31]), |
| REG_OFFSET_NAME(c0_status, cp0_status), |
| REG_OFFSET_NAME(hi, hi), |
| REG_OFFSET_NAME(lo, lo), |
| #ifdef CONFIG_CPU_HAS_SMARTMIPS |
| REG_OFFSET_NAME(acx, acx), |
| #endif |
| REG_OFFSET_NAME(c0_badvaddr, cp0_badvaddr), |
| REG_OFFSET_NAME(c0_cause, cp0_cause), |
| REG_OFFSET_NAME(c0_epc, cp0_epc), |
| #ifdef CONFIG_CPU_CAVIUM_OCTEON |
| REG_OFFSET_NAME(mpl0, mpl[0]), |
| REG_OFFSET_NAME(mpl1, mpl[1]), |
| REG_OFFSET_NAME(mpl2, mpl[2]), |
| REG_OFFSET_NAME(mtp0, mtp[0]), |
| REG_OFFSET_NAME(mtp1, mtp[1]), |
| REG_OFFSET_NAME(mtp2, mtp[2]), |
| #endif |
| REG_OFFSET_END, |
| }; |
| |
| /** |
| * regs_query_register_offset() - query register offset from its name |
| * @name: the name of a register |
| * |
| * regs_query_register_offset() returns the offset of a register in struct |
| * pt_regs from its name. If the name is invalid, this returns -EINVAL; |
| */ |
| int regs_query_register_offset(const char *name) |
| { |
| const struct pt_regs_offset *roff; |
| for (roff = regoffset_table; roff->name != NULL; roff++) |
| if (!strcmp(roff->name, name)) |
| return roff->offset; |
| return -EINVAL; |
| } |
| |
| #if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32) |
| |
| static const struct user_regset mips_regsets[] = { |
| [REGSET_GPR] = { |
| .core_note_type = NT_PRSTATUS, |
| .n = ELF_NGREG, |
| .size = sizeof(unsigned int), |
| .align = sizeof(unsigned int), |
| .regset_get = gpr32_get, |
| .set = gpr32_set, |
| }, |
| [REGSET_DSP] = { |
| .core_note_type = NT_MIPS_DSP, |
| .n = NUM_DSP_REGS + 1, |
| .size = sizeof(u32), |
| .align = sizeof(u32), |
| .regset_get = dsp32_get, |
| .set = dsp32_set, |
| .active = dsp_active, |
| }, |
| #ifdef CONFIG_MIPS_FP_SUPPORT |
| [REGSET_FPR] = { |
| .core_note_type = NT_PRFPREG, |
| .n = ELF_NFPREG, |
| .size = sizeof(elf_fpreg_t), |
| .align = sizeof(elf_fpreg_t), |
| .regset_get = fpr_get, |
| .set = fpr_set, |
| }, |
| [REGSET_FP_MODE] = { |
| .core_note_type = NT_MIPS_FP_MODE, |
| .n = 1, |
| .size = sizeof(int), |
| .align = sizeof(int), |
| .regset_get = fp_mode_get, |
| .set = fp_mode_set, |
| }, |
| #endif |
| #ifdef CONFIG_CPU_HAS_MSA |
| [REGSET_MSA] = { |
| .core_note_type = NT_MIPS_MSA, |
| .n = NUM_FPU_REGS + 1, |
| .size = 16, |
| .align = 16, |
| .regset_get = msa_get, |
| .set = msa_set, |
| }, |
| #endif |
| }; |
| |
| static const struct user_regset_view user_mips_view = { |
| .name = "mips", |
| .e_machine = ELF_ARCH, |
| .ei_osabi = ELF_OSABI, |
| .regsets = mips_regsets, |
| .n = ARRAY_SIZE(mips_regsets), |
| }; |
| |
| #endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */ |
| |
| #ifdef CONFIG_64BIT |
| |
| static const struct user_regset mips64_regsets[] = { |
| [REGSET_GPR] = { |
| .core_note_type = NT_PRSTATUS, |
| .n = ELF_NGREG, |
| .size = sizeof(unsigned long), |
| .align = sizeof(unsigned long), |
| .regset_get = gpr64_get, |
| .set = gpr64_set, |
| }, |
| [REGSET_DSP] = { |
| .core_note_type = NT_MIPS_DSP, |
| .n = NUM_DSP_REGS + 1, |
| .size = sizeof(u64), |
| .align = sizeof(u64), |
| .regset_get = dsp64_get, |
| .set = dsp64_set, |
| .active = dsp_active, |
| }, |
| #ifdef CONFIG_MIPS_FP_SUPPORT |
| [REGSET_FP_MODE] = { |
| .core_note_type = NT_MIPS_FP_MODE, |
| .n = 1, |
| .size = sizeof(int), |
| .align = sizeof(int), |
| .regset_get = fp_mode_get, |
| .set = fp_mode_set, |
| }, |
| [REGSET_FPR] = { |
| .core_note_type = NT_PRFPREG, |
| .n = ELF_NFPREG, |
| .size = sizeof(elf_fpreg_t), |
| .align = sizeof(elf_fpreg_t), |
| .regset_get = fpr_get, |
| .set = fpr_set, |
| }, |
| #endif |
| #ifdef CONFIG_CPU_HAS_MSA |
| [REGSET_MSA] = { |
| .core_note_type = NT_MIPS_MSA, |
| .n = NUM_FPU_REGS + 1, |
| .size = 16, |
| .align = 16, |
| .regset_get = msa_get, |
| .set = msa_set, |
| }, |
| #endif |
| }; |
| |
| static const struct user_regset_view user_mips64_view = { |
| .name = "mips64", |
| .e_machine = ELF_ARCH, |
| .ei_osabi = ELF_OSABI, |
| .regsets = mips64_regsets, |
| .n = ARRAY_SIZE(mips64_regsets), |
| }; |
| |
| #ifdef CONFIG_MIPS32_N32 |
| |
| static const struct user_regset_view user_mipsn32_view = { |
| .name = "mipsn32", |
| .e_flags = EF_MIPS_ABI2, |
| .e_machine = ELF_ARCH, |
| .ei_osabi = ELF_OSABI, |
| .regsets = mips64_regsets, |
| .n = ARRAY_SIZE(mips64_regsets), |
| }; |
| |
| #endif /* CONFIG_MIPS32_N32 */ |
| |
| #endif /* CONFIG_64BIT */ |
| |
| const struct user_regset_view *task_user_regset_view(struct task_struct *task) |
| { |
| #ifdef CONFIG_32BIT |
| return &user_mips_view; |
| #else |
| #ifdef CONFIG_MIPS32_O32 |
| if (test_tsk_thread_flag(task, TIF_32BIT_REGS)) |
| return &user_mips_view; |
| #endif |
| #ifdef CONFIG_MIPS32_N32 |
| if (test_tsk_thread_flag(task, TIF_32BIT_ADDR)) |
| return &user_mipsn32_view; |
| #endif |
| return &user_mips64_view; |
| #endif |
| } |
| |
| long arch_ptrace(struct task_struct *child, long request, |
| unsigned long addr, unsigned long data) |
| { |
| int ret; |
| void __user *addrp = (void __user *) addr; |
| void __user *datavp = (void __user *) data; |
| unsigned long __user *datalp = (void __user *) data; |
| |
| switch (request) { |
| /* when I and D space are separate, these will need to be fixed. */ |
| case PTRACE_PEEKTEXT: /* read word at location addr. */ |
| case PTRACE_PEEKDATA: |
| ret = generic_ptrace_peekdata(child, addr, data); |
| break; |
| |
| /* Read the word at location addr in the USER area. */ |
| case PTRACE_PEEKUSR: { |
| struct pt_regs *regs; |
| unsigned long tmp = 0; |
| |
| regs = task_pt_regs(child); |
| ret = 0; /* Default return value. */ |
| |
| switch (addr) { |
| case 0 ... 31: |
| tmp = regs->regs[addr]; |
| break; |
| #ifdef CONFIG_MIPS_FP_SUPPORT |
| case FPR_BASE ... FPR_BASE + 31: { |
| union fpureg *fregs; |
| |
| if (!tsk_used_math(child)) { |
| /* FP not yet used */ |
| tmp = -1; |
| break; |
| } |
| fregs = get_fpu_regs(child); |
| |
| #ifdef CONFIG_32BIT |
| if (test_tsk_thread_flag(child, TIF_32BIT_FPREGS)) { |
| /* |
| * The odd registers are actually the high |
| * order bits of the values stored in the even |
| * registers. |
| */ |
| tmp = get_fpr32(&fregs[(addr & ~1) - FPR_BASE], |
| addr & 1); |
| break; |
| } |
| #endif |
| tmp = get_fpr64(&fregs[addr - FPR_BASE], 0); |
| break; |
| } |
| case FPC_CSR: |
| tmp = child->thread.fpu.fcr31; |
| break; |
| case FPC_EIR: |
| /* implementation / version register */ |
| tmp = boot_cpu_data.fpu_id; |
| break; |
| #endif |
| case PC: |
| tmp = regs->cp0_epc; |
| break; |
| case CAUSE: |
| tmp = regs->cp0_cause; |
| break; |
| case BADVADDR: |
| tmp = regs->cp0_badvaddr; |
| break; |
| case MMHI: |
| tmp = regs->hi; |
| break; |
| case MMLO: |
| tmp = regs->lo; |
| break; |
| #ifdef CONFIG_CPU_HAS_SMARTMIPS |
| case ACX: |
| tmp = regs->acx; |
| break; |
| #endif |
| case DSP_BASE ... DSP_BASE + 5: { |
| dspreg_t *dregs; |
| |
| if (!cpu_has_dsp) { |
| tmp = 0; |
| ret = -EIO; |
| goto out; |
| } |
| dregs = __get_dsp_regs(child); |
| tmp = dregs[addr - DSP_BASE]; |
| break; |
| } |
| case DSP_CONTROL: |
| if (!cpu_has_dsp) { |
| tmp = 0; |
| ret = -EIO; |
| goto out; |
| } |
| tmp = child->thread.dsp.dspcontrol; |
| break; |
| default: |
| tmp = 0; |
| ret = -EIO; |
| goto out; |
| } |
| ret = put_user(tmp, datalp); |
| break; |
| } |
| |
| /* when I and D space are separate, this will have to be fixed. */ |
| case PTRACE_POKETEXT: /* write the word at location addr. */ |
| case PTRACE_POKEDATA: |
| ret = generic_ptrace_pokedata(child, addr, data); |
| break; |
| |
| case PTRACE_POKEUSR: { |
| struct pt_regs *regs; |
| ret = 0; |
| regs = task_pt_regs(child); |
| |
| switch (addr) { |
| case 0 ... 31: |
| regs->regs[addr] = data; |
| /* System call number may have been changed */ |
| if (addr == 2) |
| mips_syscall_update_nr(child, regs); |
| else if (addr == 4 && |
| mips_syscall_is_indirect(child, regs)) |
| mips_syscall_update_nr(child, regs); |
| break; |
| #ifdef CONFIG_MIPS_FP_SUPPORT |
| case FPR_BASE ... FPR_BASE + 31: { |
| union fpureg *fregs = get_fpu_regs(child); |
| |
| init_fp_ctx(child); |
| #ifdef CONFIG_32BIT |
| if (test_tsk_thread_flag(child, TIF_32BIT_FPREGS)) { |
| /* |
| * The odd registers are actually the high |
| * order bits of the values stored in the even |
| * registers. |
| */ |
| set_fpr32(&fregs[(addr & ~1) - FPR_BASE], |
| addr & 1, data); |
| break; |
| } |
| #endif |
| set_fpr64(&fregs[addr - FPR_BASE], 0, data); |
| break; |
| } |
| case FPC_CSR: |
| init_fp_ctx(child); |
| ptrace_setfcr31(child, data); |
| break; |
| #endif |
| case PC: |
| regs->cp0_epc = data; |
| break; |
| case MMHI: |
| regs->hi = data; |
| break; |
| case MMLO: |
| regs->lo = data; |
| break; |
| #ifdef CONFIG_CPU_HAS_SMARTMIPS |
| case ACX: |
| regs->acx = data; |
| break; |
| #endif |
| case DSP_BASE ... DSP_BASE + 5: { |
| dspreg_t *dregs; |
| |
| if (!cpu_has_dsp) { |
| ret = -EIO; |
| break; |
| } |
| |
| dregs = __get_dsp_regs(child); |
| dregs[addr - DSP_BASE] = data; |
| break; |
| } |
| case DSP_CONTROL: |
| if (!cpu_has_dsp) { |
| ret = -EIO; |
| break; |
| } |
| child->thread.dsp.dspcontrol = data; |
| break; |
| default: |
| /* The rest are not allowed. */ |
| ret = -EIO; |
| break; |
| } |
| break; |
| } |
| |
| case PTRACE_GETREGS: |
| ret = ptrace_getregs(child, datavp); |
| break; |
| |
| case PTRACE_SETREGS: |
| ret = ptrace_setregs(child, datavp); |
| break; |
| |
| #ifdef CONFIG_MIPS_FP_SUPPORT |
| case PTRACE_GETFPREGS: |
| ret = ptrace_getfpregs(child, datavp); |
| break; |
| |
| case PTRACE_SETFPREGS: |
| ret = ptrace_setfpregs(child, datavp); |
| break; |
| #endif |
| case PTRACE_GET_THREAD_AREA: |
| ret = put_user(task_thread_info(child)->tp_value, datalp); |
| break; |
| |
| case PTRACE_GET_WATCH_REGS: |
| ret = ptrace_get_watch_regs(child, addrp); |
| break; |
| |
| case PTRACE_SET_WATCH_REGS: |
| ret = ptrace_set_watch_regs(child, addrp); |
| break; |
| |
| default: |
| ret = ptrace_request(child, request, addr, data); |
| break; |
| } |
| out: |
| return ret; |
| } |
| |
| /* |
| * Notification of system call entry/exit |
| * - triggered by current->work.syscall_trace |
| */ |
| asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall) |
| { |
| user_exit(); |
| |
| current_thread_info()->syscall = syscall; |
| |
| if (test_thread_flag(TIF_SYSCALL_TRACE)) { |
| if (ptrace_report_syscall_entry(regs)) |
| return -1; |
| syscall = current_thread_info()->syscall; |
| } |
| |
| #ifdef CONFIG_SECCOMP |
| if (unlikely(test_thread_flag(TIF_SECCOMP))) { |
| int ret, i; |
| struct seccomp_data sd; |
| unsigned long args[6]; |
| |
| sd.nr = syscall; |
| sd.arch = syscall_get_arch(current); |
| syscall_get_arguments(current, regs, args); |
| for (i = 0; i < 6; i++) |
| sd.args[i] = args[i]; |
| sd.instruction_pointer = KSTK_EIP(current); |
| |
| ret = __secure_computing(&sd); |
| if (ret == -1) |
| return ret; |
| syscall = current_thread_info()->syscall; |
| } |
| #endif |
| |
| if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
| trace_sys_enter(regs, regs->regs[2]); |
| |
| audit_syscall_entry(syscall, regs->regs[4], regs->regs[5], |
| regs->regs[6], regs->regs[7]); |
| |
| /* |
| * Negative syscall numbers are mistaken for rejected syscalls, but |
| * won't have had the return value set appropriately, so we do so now. |
| */ |
| if (syscall < 0) |
| syscall_set_return_value(current, regs, -ENOSYS, 0); |
| return syscall; |
| } |
| |
| /* |
| * Notification of system call entry/exit |
| * - triggered by current->work.syscall_trace |
| */ |
| asmlinkage void syscall_trace_leave(struct pt_regs *regs) |
| { |
| /* |
| * We may come here right after calling schedule_user() |
| * or do_notify_resume(), in which case we can be in RCU |
| * user mode. |
| */ |
| user_exit(); |
| |
| audit_syscall_exit(regs); |
| |
| if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
| trace_sys_exit(regs, regs_return_value(regs)); |
| |
| if (test_thread_flag(TIF_SYSCALL_TRACE)) |
| ptrace_report_syscall_exit(regs, 0); |
| |
| user_enter(); |
| } |