1 // SPDX-License-Identifier: GPL-2.0
3 * Author: Hanlu Li <lihanlu@loongson.cn>
4 * Huacai Chen <chenhuacai@loongson.cn>
6 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
9 * Copyright (C) 1992 Ross Biro
10 * Copyright (C) Linus Torvalds
11 * Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle
12 * Copyright (C) 1996 David S. Miller
13 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
14 * Copyright (C) 1999 MIPS Technologies, Inc.
15 * Copyright (C) 2000 Ulf Carlsson
17 #include <linux/kernel.h>
18 #include <linux/audit.h>
19 #include <linux/compiler.h>
20 #include <linux/context_tracking.h>
21 #include <linux/elf.h>
22 #include <linux/errno.h>
24 #include <linux/ptrace.h>
25 #include <linux/regset.h>
26 #include <linux/sched.h>
27 #include <linux/sched/task_stack.h>
28 #include <linux/security.h>
29 #include <linux/smp.h>
30 #include <linux/stddef.h>
31 #include <linux/seccomp.h>
32 #include <linux/uaccess.h>
34 #include <asm/byteorder.h>
36 #include <asm/cpu-info.h>
38 #include <asm/loongarch.h>
40 #include <asm/pgtable.h>
41 #include <asm/processor.h>
43 #include <asm/syscall.h>
45 static void init_fp_ctx(struct task_struct *target)
47 /* The target already has context */
48 if (tsk_used_math(target))
51 /* Begin with data registers set to all 1s... */
52 memset(&target->thread.fpu.fpr, ~0, sizeof(target->thread.fpu.fpr));
53 set_stopped_child_used_math(target);
57 * Called by kernel/ptrace.c when detaching..
59 * Make sure single step bits etc are not set.
61 void ptrace_disable(struct task_struct *child)
63 /* Don't load the watchpoint registers for the ex-child. */
64 clear_tsk_thread_flag(child, TIF_LOAD_WATCH);
65 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
68 /* regset get/set implementations */
70 static int gpr_get(struct task_struct *target,
71 const struct user_regset *regset,
75 struct pt_regs *regs = task_pt_regs(target);
77 r = membuf_write(&to, ®s->regs, sizeof(u64) * GPR_NUM);
78 r = membuf_write(&to, ®s->orig_a0, sizeof(u64));
79 r = membuf_write(&to, ®s->csr_era, sizeof(u64));
80 r = membuf_write(&to, ®s->csr_badvaddr, sizeof(u64));
85 static int gpr_set(struct task_struct *target,
86 const struct user_regset *regset,
87 unsigned int pos, unsigned int count,
88 const void *kbuf, const void __user *ubuf)
91 int a0_start = sizeof(u64) * GPR_NUM;
92 int era_start = a0_start + sizeof(u64);
93 int badvaddr_start = era_start + sizeof(u64);
94 struct pt_regs *regs = task_pt_regs(target);
96 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
99 err |= user_regset_copyin(&pos, &count, &kbuf, &ubuf,
101 a0_start, a0_start + sizeof(u64));
102 err |= user_regset_copyin(&pos, &count, &kbuf, &ubuf,
104 era_start, era_start + sizeof(u64));
105 err |= user_regset_copyin(&pos, &count, &kbuf, &ubuf,
107 badvaddr_start, badvaddr_start + sizeof(u64));
114 * Get the general floating-point registers.
116 static int gfpr_get(struct task_struct *target, struct membuf *to)
118 return membuf_write(to, &target->thread.fpu.fpr,
119 sizeof(elf_fpreg_t) * NUM_FPU_REGS);
122 static int gfpr_get_simd(struct task_struct *target, struct membuf *to)
127 BUILD_BUG_ON(sizeof(fpr_val) != sizeof(elf_fpreg_t));
128 for (i = 0; i < NUM_FPU_REGS; i++) {
129 fpr_val = get_fpr64(&target->thread.fpu.fpr[i], 0);
130 r = membuf_write(to, &fpr_val, sizeof(elf_fpreg_t));
137 * Choose the appropriate helper for general registers, and then copy
138 * the FCC and FCSR registers separately.
140 static int fpr_get(struct task_struct *target,
141 const struct user_regset *regset,
146 if (sizeof(target->thread.fpu.fpr[0]) == sizeof(elf_fpreg_t))
147 r = gfpr_get(target, &to);
149 r = gfpr_get_simd(target, &to);
151 r = membuf_write(&to, &target->thread.fpu.fcc, sizeof(target->thread.fpu.fcc));
152 r = membuf_write(&to, &target->thread.fpu.fcsr, sizeof(target->thread.fpu.fcsr));
157 static int gfpr_set(struct task_struct *target,
158 unsigned int *pos, unsigned int *count,
159 const void **kbuf, const void __user **ubuf)
161 return user_regset_copyin(pos, count, kbuf, ubuf,
162 &target->thread.fpu.fpr,
163 0, NUM_FPU_REGS * sizeof(elf_fpreg_t));
166 static int gfpr_set_simd(struct task_struct *target,
167 unsigned int *pos, unsigned int *count,
168 const void **kbuf, const void __user **ubuf)
173 BUILD_BUG_ON(sizeof(fpr_val) != sizeof(elf_fpreg_t));
174 for (i = 0; i < NUM_FPU_REGS && *count > 0; i++) {
175 err = user_regset_copyin(pos, count, kbuf, ubuf,
176 &fpr_val, i * sizeof(elf_fpreg_t),
177 (i + 1) * sizeof(elf_fpreg_t));
180 set_fpr64(&target->thread.fpu.fpr[i], 0, fpr_val);
187 * Choose the appropriate helper for general registers, and then copy
188 * the FCC register separately.
190 static int fpr_set(struct task_struct *target,
191 const struct user_regset *regset,
192 unsigned int pos, unsigned int count,
193 const void *kbuf, const void __user *ubuf)
195 const int fcc_start = NUM_FPU_REGS * sizeof(elf_fpreg_t);
196 const int fcsr_start = fcc_start + sizeof(u64);
199 BUG_ON(count % sizeof(elf_fpreg_t));
200 if (pos + count > sizeof(elf_fpregset_t))
205 if (sizeof(target->thread.fpu.fpr[0]) == sizeof(elf_fpreg_t))
206 err = gfpr_set(target, &pos, &count, &kbuf, &ubuf);
208 err = gfpr_set_simd(target, &pos, &count, &kbuf, &ubuf);
212 err |= user_regset_copyin(&pos, &count, &kbuf, &ubuf,
213 &target->thread.fpu.fcc, fcc_start,
214 fcc_start + sizeof(u64));
215 err |= user_regset_copyin(&pos, &count, &kbuf, &ubuf,
216 &target->thread.fpu.fcsr, fcsr_start,
217 fcsr_start + sizeof(u32));
222 static int cfg_get(struct task_struct *target,
223 const struct user_regset *regset,
230 while (to.left > 0) {
231 cfg_val = read_cpucfg(i++);
232 r = membuf_write(&to, &cfg_val, sizeof(u32));
239 * CFG registers are read-only.
241 static int cfg_set(struct task_struct *target,
242 const struct user_regset *regset,
243 unsigned int pos, unsigned int count,
244 const void *kbuf, const void __user *ubuf)
249 struct pt_regs_offset {
254 #define REG_OFFSET_NAME(n, r) {.name = #n, .offset = offsetof(struct pt_regs, r)}
255 #define REG_OFFSET_END {.name = NULL, .offset = 0}
257 static const struct pt_regs_offset regoffset_table[] = {
258 REG_OFFSET_NAME(r0, regs[0]),
259 REG_OFFSET_NAME(r1, regs[1]),
260 REG_OFFSET_NAME(r2, regs[2]),
261 REG_OFFSET_NAME(r3, regs[3]),
262 REG_OFFSET_NAME(r4, regs[4]),
263 REG_OFFSET_NAME(r5, regs[5]),
264 REG_OFFSET_NAME(r6, regs[6]),
265 REG_OFFSET_NAME(r7, regs[7]),
266 REG_OFFSET_NAME(r8, regs[8]),
267 REG_OFFSET_NAME(r9, regs[9]),
268 REG_OFFSET_NAME(r10, regs[10]),
269 REG_OFFSET_NAME(r11, regs[11]),
270 REG_OFFSET_NAME(r12, regs[12]),
271 REG_OFFSET_NAME(r13, regs[13]),
272 REG_OFFSET_NAME(r14, regs[14]),
273 REG_OFFSET_NAME(r15, regs[15]),
274 REG_OFFSET_NAME(r16, regs[16]),
275 REG_OFFSET_NAME(r17, regs[17]),
276 REG_OFFSET_NAME(r18, regs[18]),
277 REG_OFFSET_NAME(r19, regs[19]),
278 REG_OFFSET_NAME(r20, regs[20]),
279 REG_OFFSET_NAME(r21, regs[21]),
280 REG_OFFSET_NAME(r22, regs[22]),
281 REG_OFFSET_NAME(r23, regs[23]),
282 REG_OFFSET_NAME(r24, regs[24]),
283 REG_OFFSET_NAME(r25, regs[25]),
284 REG_OFFSET_NAME(r26, regs[26]),
285 REG_OFFSET_NAME(r27, regs[27]),
286 REG_OFFSET_NAME(r28, regs[28]),
287 REG_OFFSET_NAME(r29, regs[29]),
288 REG_OFFSET_NAME(r30, regs[30]),
289 REG_OFFSET_NAME(r31, regs[31]),
290 REG_OFFSET_NAME(orig_a0, orig_a0),
291 REG_OFFSET_NAME(csr_era, csr_era),
292 REG_OFFSET_NAME(csr_badvaddr, csr_badvaddr),
293 REG_OFFSET_NAME(csr_crmd, csr_crmd),
294 REG_OFFSET_NAME(csr_prmd, csr_prmd),
295 REG_OFFSET_NAME(csr_euen, csr_euen),
296 REG_OFFSET_NAME(csr_ecfg, csr_ecfg),
297 REG_OFFSET_NAME(csr_estat, csr_estat),
302 * regs_query_register_offset() - query register offset from its name
303 * @name: the name of a register
305 * regs_query_register_offset() returns the offset of a register in struct
306 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
308 int regs_query_register_offset(const char *name)
310 const struct pt_regs_offset *roff;
312 for (roff = regoffset_table; roff->name != NULL; roff++)
313 if (!strcmp(roff->name, name))
318 enum loongarch_regset {
324 static const struct user_regset loongarch64_regsets[] = {
326 .core_note_type = NT_PRSTATUS,
328 .size = sizeof(elf_greg_t),
329 .align = sizeof(elf_greg_t),
330 .regset_get = gpr_get,
334 .core_note_type = NT_PRFPREG,
336 .size = sizeof(elf_fpreg_t),
337 .align = sizeof(elf_fpreg_t),
338 .regset_get = fpr_get,
342 .core_note_type = NT_LOONGARCH_CPUCFG,
345 .align = sizeof(u32),
346 .regset_get = cfg_get,
351 static const struct user_regset_view user_loongarch64_view = {
352 .name = "loongarch64",
353 .e_machine = ELF_ARCH,
354 .regsets = loongarch64_regsets,
355 .n = ARRAY_SIZE(loongarch64_regsets),
359 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
361 return &user_loongarch64_view;
364 static inline int read_user(struct task_struct *target, unsigned long addr,
365 unsigned long __user *data)
367 unsigned long tmp = 0;
371 tmp = task_pt_regs(target)->regs[addr];
374 tmp = task_pt_regs(target)->orig_a0;
377 tmp = task_pt_regs(target)->csr_era;
380 tmp = task_pt_regs(target)->csr_badvaddr;
386 return put_user(tmp, data);
389 static inline int write_user(struct task_struct *target, unsigned long addr,
394 task_pt_regs(target)->regs[addr] = data;
397 task_pt_regs(target)->orig_a0 = data;
400 task_pt_regs(target)->csr_era = data;
403 task_pt_regs(target)->csr_badvaddr = data;
412 long arch_ptrace(struct task_struct *child, long request,
413 unsigned long addr, unsigned long data)
416 unsigned long __user *datap = (void __user *) data;
420 ret = read_user(child, addr, datap);
424 ret = write_user(child, addr, data);
428 ret = ptrace_request(child, request, addr, data);