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-rw-r--r--arch/openrisc/include/asm/ptrace.h131
-rw-r--r--arch/openrisc/kernel/ptrace.c211
2 files changed, 342 insertions, 0 deletions
diff --git a/arch/openrisc/include/asm/ptrace.h b/arch/openrisc/include/asm/ptrace.h
new file mode 100644
index 000000000000..054537c5f9c9
--- /dev/null
+++ b/arch/openrisc/include/asm/ptrace.h
@@ -0,0 +1,131 @@
1/*
2 * OpenRISC Linux
3 *
4 * Linux architectural port borrowing liberally from similar works of
5 * others. All original copyrights apply as per the original source
6 * declaration.
7 *
8 * OpenRISC implementation:
9 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
10 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
11 * et al.
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 */
18
19#ifndef __ASM_OPENRISC_PTRACE_H
20#define __ASM_OPENRISC_PTRACE_H
21
22#include <asm/spr_defs.h>
23
24#ifndef __ASSEMBLY__
25/*
26 * This is the layout of the regset returned by the GETREGSET ptrace call
27 */
28struct user_regs_struct {
29 /* GPR R0-R31... */
30 unsigned long gpr[32];
31 unsigned long pc;
32 unsigned long sr;
33 unsigned long pad1;
34 unsigned long pad2;
35};
36#endif
37
38#ifdef __KERNEL__
39
40/*
41 * Make kernel PTrace/register structures opaque to userspace... userspace can
42 * access thread state via the regset mechanism. This allows us a bit of
43 * flexibility in how we order the registers on the stack, permitting some
44 * optimizations like packing call-clobbered registers together so that
45 * they share a cacheline (not done yet, though... future optimization).
46 */
47
48#ifndef __ASSEMBLY__
49/*
50 * This struct describes how the registers are laid out on the kernel stack
51 * during a syscall or other kernel entry.
52 *
53 * This structure should always be cacheline aligned on the stack.
54 * FIXME: I don't think that's the case right now. The alignment is
55 * taken care of elsewhere... head.S, process.c, etc.
56 */
57
58struct pt_regs {
59 union {
60 struct {
61 /* Named registers */
62 long sr; /* Stored in place of r0 */
63 long sp; /* r1 */
64 };
65 struct {
66 /* Old style */
67 long offset[2];
68 long gprs[30];
69 };
70 struct {
71 /* New style */
72 long gpr[32];
73 };
74 };
75 long pc;
76 long orig_gpr11; /* For restarting system calls */
77 long syscallno; /* Syscall number (used by strace) */
78 long dummy; /* Cheap alignment fix */
79};
80#endif /* __ASSEMBLY__ */
81
82/* TODO: Rename this to REDZONE because that's what it is */
83#define STACK_FRAME_OVERHEAD 128 /* size of minimum stack frame */
84
85#define instruction_pointer(regs) ((regs)->pc)
86#define user_mode(regs) (((regs)->sr & SPR_SR_SM) == 0)
87#define user_stack_pointer(regs) ((unsigned long)(regs)->sp)
88#define profile_pc(regs) instruction_pointer(regs)
89
90/*
91 * Offsets used by 'ptrace' system call interface.
92 */
93#define PT_SR 0
94#define PT_SP 4
95#define PT_GPR2 8
96#define PT_GPR3 12
97#define PT_GPR4 16
98#define PT_GPR5 20
99#define PT_GPR6 24
100#define PT_GPR7 28
101#define PT_GPR8 32
102#define PT_GPR9 36
103#define PT_GPR10 40
104#define PT_GPR11 44
105#define PT_GPR12 48
106#define PT_GPR13 52
107#define PT_GPR14 56
108#define PT_GPR15 60
109#define PT_GPR16 64
110#define PT_GPR17 68
111#define PT_GPR18 72
112#define PT_GPR19 76
113#define PT_GPR20 80
114#define PT_GPR21 84
115#define PT_GPR22 88
116#define PT_GPR23 92
117#define PT_GPR24 96
118#define PT_GPR25 100
119#define PT_GPR26 104
120#define PT_GPR27 108
121#define PT_GPR28 112
122#define PT_GPR29 116
123#define PT_GPR30 120
124#define PT_GPR31 124
125#define PT_PC 128
126#define PT_ORIG_GPR11 132
127#define PT_SYSCALLNO 136
128
129#endif /* __KERNEL__ */
130
131#endif /* __ASM_OPENRISC_PTRACE_H */
diff --git a/arch/openrisc/kernel/ptrace.c b/arch/openrisc/kernel/ptrace.c
new file mode 100644
index 000000000000..656b94beab89
--- /dev/null
+++ b/arch/openrisc/kernel/ptrace.c
@@ -0,0 +1,211 @@
1/*
2 * OpenRISC ptrace.c
3 *
4 * Linux architectural port borrowing liberally from similar works of
5 * others. All original copyrights apply as per the original source
6 * declaration.
7 *
8 * Modifications for the OpenRISC architecture:
9 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
10 * Copyright (C) 2005 Gyorgy Jeney <nog@bsemi.com>
11 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
17 */
18
19#include <stddef.h>
20#include <linux/kernel.h>
21#include <linux/sched.h>
22#include <linux/string.h>
23
24#include <linux/mm.h>
25#include <linux/errno.h>
26#include <linux/ptrace.h>
27#include <linux/audit.h>
28#include <linux/regset.h>
29#include <linux/tracehook.h>
30#include <linux/elf.h>
31
32#include <asm/thread_info.h>
33#include <asm/segment.h>
34#include <asm/page.h>
35#include <asm/pgtable.h>
36#include <asm/system.h>
37
38/*
39 * Copy the thread state to a regset that can be interpreted by userspace.
40 *
41 * It doesn't matter what our internal pt_regs structure looks like. The
42 * important thing is that we export a consistent view of the thread state
43 * to userspace. As such, we need to make sure that the regset remains
44 * ABI compatible as defined by the struct user_regs_struct:
45 *
46 * (Each item is a 32-bit word)
47 * r0 = 0 (exported for clarity)
48 * 31 GPRS r1-r31
49 * PC (Program counter)
50 * SR (Supervision register)
51 */
52static int genregs_get(struct task_struct *target,
53 const struct user_regset *regset,
54 unsigned int pos, unsigned int count,
55 void *kbuf, void __user * ubuf)
56{
57 const struct pt_regs *regs = task_pt_regs(target);
58 int ret;
59
60 /* r0 */
61 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, 0, 4);
62
63 if (!ret)
64 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
65 regs->gpr+1, 4, 4*32);
66 if (!ret)
67 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
68 &regs->pc, 4*32, 4*33);
69 if (!ret)
70 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
71 &regs->sr, 4*33, 4*34);
72 if (!ret)
73 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
74 4*34, -1);
75
76 return ret;
77}
78
79/*
80 * Set the thread state from a regset passed in via ptrace
81 */
82static int genregs_set(struct task_struct *target,
83 const struct user_regset *regset,
84 unsigned int pos, unsigned int count,
85 const void *kbuf, const void __user * ubuf)
86{
87 struct pt_regs *regs = task_pt_regs(target);
88 int ret;
89
90 /* ignore r0 */
91 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, 4);
92 /* r1 - r31 */
93 if (!ret)
94 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
95 regs->gpr+1, 4, 4*32);
96 /* PC */
97 if (!ret)
98 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
99 &regs->pc, 4*32, 4*33);
100 /*
101 * Skip SR and padding... userspace isn't allowed to changes bits in
102 * the Supervision register
103 */
104 if (!ret)
105 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
106 4*33, -1);
107
108 return ret;
109}
110
111/*
112 * Define the register sets available on OpenRISC under Linux
113 */
114enum or1k_regset {
115 REGSET_GENERAL,
116};
117
118static const struct user_regset or1k_regsets[] = {
119 [REGSET_GENERAL] = {
120 .core_note_type = NT_PRSTATUS,
121 .n = ELF_NGREG,
122 .size = sizeof(long),
123 .align = sizeof(long),
124 .get = genregs_get,
125 .set = genregs_set,
126 },
127};
128
129static const struct user_regset_view user_or1k_native_view = {
130 .name = "or1k",
131 .e_machine = EM_OPENRISC,
132 .regsets = or1k_regsets,
133 .n = ARRAY_SIZE(or1k_regsets),
134};
135
136const struct user_regset_view *task_user_regset_view(struct task_struct *task)
137{
138 return &user_or1k_native_view;
139}
140
141/*
142 * does not yet catch signals sent when the child dies.
143 * in exit.c or in signal.c.
144 */
145
146
147/*
148 * Called by kernel/ptrace.c when detaching..
149 *
150 * Make sure the single step bit is not set.
151 */
152void ptrace_disable(struct task_struct *child)
153{
154 pr_debug("ptrace_disable(): TODO\n");
155
156 user_disable_single_step(child);
157 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
158}
159
160long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
161 unsigned long data)
162{
163 int ret;
164
165 switch (request) {
166 default:
167 ret = ptrace_request(child, request, addr, data);
168 break;
169 }
170
171 return ret;
172}
173
174/*
175 * Notification of system call entry/exit
176 * - triggered by current->work.syscall_trace
177 */
178asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
179{
180 long ret = 0;
181
182 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
183 tracehook_report_syscall_entry(regs))
184 /*
185 * Tracing decided this syscall should not happen.
186 * We'll return a bogus call number to get an ENOSYS
187 * error, but leave the original number in <something>.
188 */
189 ret = -1L;
190
191 /* Are these regs right??? */
192 if (unlikely(current->audit_context))
193 audit_syscall_entry(audit_arch(), regs->syscallno,
194 regs->gpr[3], regs->gpr[4],
195 regs->gpr[5], regs->gpr[6]);
196
197 return ret ? : regs->syscallno;
198}
199
200asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
201{
202 int step;
203
204 if (unlikely(current->audit_context))
205 audit_syscall_exit(AUDITSC_RESULT(regs->gpr[11]),
206 regs->gpr[11]);
207
208 step = test_thread_flag(TIF_SINGLESTEP);
209 if (step || test_thread_flag(TIF_SYSCALL_TRACE))
210 tracehook_report_syscall_exit(regs, step);
211}
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-27 06:34:03 -0500