~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/mips/include/asm/ptrace.h

Version: ~ [ linux-5.13-rc2 ] ~ [ linux-5.12.4 ] ~ [ linux-5.11.21 ] ~ [ linux-5.10.37 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.119 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.190 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.232 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.268 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.268 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * This file is subject to the terms and conditions of the GNU General Public
  3  * License.  See the file "COPYING" in the main directory of this archive
  4  * for more details.
  5  *
  6  * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000 by Ralf Baechle
  7  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
  8  */
  9 #ifndef _ASM_PTRACE_H
 10 #define _ASM_PTRACE_H
 11 
 12 
 13 #include <linux/compiler.h>
 14 #include <linux/linkage.h>
 15 #include <linux/types.h>
 16 #include <asm/isadep.h>
 17 #include <asm/page.h>
 18 #include <asm/thread_info.h>
 19 #include <uapi/asm/ptrace.h>
 20 
 21 /*
 22  * This struct defines the way the registers are stored on the stack during a
 23  * system call/exception. As usual the registers k0/k1 aren't being saved.
 24  *
 25  * If you add a register here, also add it to regoffset_table[] in
 26  * arch/mips/kernel/ptrace.c.
 27  */
 28 struct pt_regs {
 29 #ifdef CONFIG_32BIT
 30         /* Pad bytes for argument save space on the stack. */
 31         unsigned long pad0[8];
 32 #endif
 33 
 34         /* Saved main processor registers. */
 35         unsigned long regs[32];
 36 
 37         /* Saved special registers. */
 38         unsigned long cp0_status;
 39         unsigned long hi;
 40         unsigned long lo;
 41 #ifdef CONFIG_CPU_HAS_SMARTMIPS
 42         unsigned long acx;
 43 #endif
 44         unsigned long cp0_badvaddr;
 45         unsigned long cp0_cause;
 46         unsigned long cp0_epc;
 47 #ifdef CONFIG_CPU_CAVIUM_OCTEON
 48         unsigned long long mpl[6];        /* MTM{0-5} */
 49         unsigned long long mtp[6];        /* MTP{0-5} */
 50 #endif
 51         unsigned long __last[0];
 52 } __aligned(8);
 53 
 54 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
 55 {
 56         return regs->regs[31];
 57 }
 58 
 59 /*
 60  * Don't use asm-generic/ptrace.h it defines FP accessors that don't make
 61  * sense on MIPS.  We rather want an error if they get invoked.
 62  */
 63 
 64 static inline void instruction_pointer_set(struct pt_regs *regs,
 65                                            unsigned long val)
 66 {
 67         regs->cp0_epc = val;
 68 }
 69 
 70 /* Query offset/name of register from its name/offset */
 71 extern int regs_query_register_offset(const char *name);
 72 #define MAX_REG_OFFSET (offsetof(struct pt_regs, __last))
 73 
 74 /**
 75  * regs_get_register() - get register value from its offset
 76  * @regs:       pt_regs from which register value is gotten.
 77  * @offset:     offset number of the register.
 78  *
 79  * regs_get_register returns the value of a register. The @offset is the
 80  * offset of the register in struct pt_regs address which specified by @regs.
 81  * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
 82  */
 83 static inline unsigned long regs_get_register(struct pt_regs *regs,
 84                                               unsigned int offset)
 85 {
 86         if (unlikely(offset > MAX_REG_OFFSET))
 87                 return 0;
 88 
 89         return *(unsigned long *)((unsigned long)regs + offset);
 90 }
 91 
 92 /**
 93  * regs_within_kernel_stack() - check the address in the stack
 94  * @regs:       pt_regs which contains kernel stack pointer.
 95  * @addr:       address which is checked.
 96  *
 97  * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
 98  * If @addr is within the kernel stack, it returns true. If not, returns false.
 99  */
100 static inline int regs_within_kernel_stack(struct pt_regs *regs,
101                                            unsigned long addr)
102 {
103         return ((addr & ~(THREAD_SIZE - 1))  ==
104                 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
105 }
106 
107 /**
108  * regs_get_kernel_stack_nth() - get Nth entry of the stack
109  * @regs:       pt_regs which contains kernel stack pointer.
110  * @n:          stack entry number.
111  *
112  * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
113  * is specified by @regs. If the @n th entry is NOT in the kernel stack,
114  * this returns 0.
115  */
116 static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
117                                                       unsigned int n)
118 {
119         unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
120 
121         addr += n;
122         if (regs_within_kernel_stack(regs, (unsigned long)addr))
123                 return *addr;
124         else
125                 return 0;
126 }
127 
128 struct task_struct;
129 
130 extern int ptrace_getregs(struct task_struct *child,
131         struct user_pt_regs __user *data);
132 extern int ptrace_setregs(struct task_struct *child,
133         struct user_pt_regs __user *data);
134 
135 extern int ptrace_getfpregs(struct task_struct *child, __u32 __user *data);
136 extern int ptrace_setfpregs(struct task_struct *child, __u32 __user *data);
137 
138 extern int ptrace_get_watch_regs(struct task_struct *child,
139         struct pt_watch_regs __user *addr);
140 extern int ptrace_set_watch_regs(struct task_struct *child,
141         struct pt_watch_regs __user *addr);
142 
143 /*
144  * Does the process account for user or for system time?
145  */
146 #define user_mode(regs) (((regs)->cp0_status & KU_MASK) == KU_USER)
147 
148 static inline int is_syscall_success(struct pt_regs *regs)
149 {
150         return !regs->regs[7];
151 }
152 
153 static inline long regs_return_value(struct pt_regs *regs)
154 {
155         if (is_syscall_success(regs) || !user_mode(regs))
156                 return regs->regs[2];
157         else
158                 return -regs->regs[2];
159 }
160 
161 #define instruction_pointer(regs) ((regs)->cp0_epc)
162 #define profile_pc(regs) instruction_pointer(regs)
163 
164 extern asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall);
165 extern asmlinkage void syscall_trace_leave(struct pt_regs *regs);
166 
167 extern void die(const char *, struct pt_regs *) __noreturn;
168 
169 static inline void die_if_kernel(const char *str, struct pt_regs *regs)
170 {
171         if (unlikely(!user_mode(regs)))
172                 die(str, regs);
173 }
174 
175 #define current_pt_regs()                                               \
176 ({                                                                      \
177         unsigned long sp = (unsigned long)__builtin_frame_address(0);   \
178         (struct pt_regs *)((sp | (THREAD_SIZE - 1)) + 1 - 32) - 1;      \
179 })
180 
181 /* Helpers for working with the user stack pointer */
182 
183 static inline unsigned long user_stack_pointer(struct pt_regs *regs)
184 {
185         return regs->regs[29];
186 }
187 
188 static inline void user_stack_pointer_set(struct pt_regs *regs,
189         unsigned long val)
190 {
191         regs->regs[29] = val;
192 }
193 
194 #endif /* _ASM_PTRACE_H */
195 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp