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authorAdrian Bunk <bunk@kernel.org>2008-07-24 00:28:50 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-24 13:47:24 -0400
commitf606ddf42fd4edc558eeb48bfee66d2c591571d2 (patch)
tree193f00db121201255b2629fce43b99a53c4ec735 /arch/v850/kernel/ptrace.c
parent99764fa4ceeecba8b9e0a8a5565b418a2e94f83b (diff)
remove the v850 port
Trying to compile the v850 port brings many compile errors, one of them exists since at least kernel 2.6.19. There also seems to be noone willing to bring this port back into a usable state. This patch therefore removes the v850 port. If anyone ever decides to revive the v850 port the code will still be available from older kernels, and it wouldn't be impossible for the port to reenter the kernel if it would become actively maintained again. Signed-off-by: Adrian Bunk <bunk@kernel.org> Acked-by: Greg Ungerer <gerg@uclinux.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/v850/kernel/ptrace.c')
-rw-r--r--arch/v850/kernel/ptrace.c235
1 files changed, 0 insertions, 235 deletions
diff --git a/arch/v850/kernel/ptrace.c b/arch/v850/kernel/ptrace.c
deleted file mode 100644
index a458ac941b25..000000000000
--- a/arch/v850/kernel/ptrace.c
+++ /dev/null
@@ -1,235 +0,0 @@
1/*
2 * arch/v850/kernel/ptrace.c -- `ptrace' system call
3 *
4 * Copyright (C) 2002,03,04 NEC Electronics Corporation
5 * Copyright (C) 2002,03,04 Miles Bader <miles@gnu.org>
6 *
7 * Derived from arch/mips/kernel/ptrace.c:
8 *
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 *
16 * This file is subject to the terms and conditions of the GNU General
17 * Public License. See the file COPYING in the main directory of this
18 * archive for more details.
19 */
20
21#include <linux/kernel.h>
22#include <linux/mm.h>
23#include <linux/sched.h>
24#include <linux/ptrace.h>
25#include <linux/signal.h>
26
27#include <asm/errno.h>
28#include <asm/ptrace.h>
29#include <asm/processor.h>
30#include <asm/uaccess.h>
31
32/* Returns the address where the register at REG_OFFS in P is stashed away. */
33static v850_reg_t *reg_save_addr (unsigned reg_offs, struct task_struct *t)
34{
35 struct pt_regs *regs;
36
37 /* Three basic cases:
38
39 (1) A register normally saved before calling the scheduler, is
40 available in the kernel entry pt_regs structure at the top
41 of the kernel stack. The kernel trap/irq exit path takes
42 care to save/restore almost all registers for ptrace'd
43 processes.
44
45 (2) A call-clobbered register, where the process P entered the
46 kernel via [syscall] trap, is not stored anywhere; that's
47 OK, because such registers are not expected to be preserved
48 when the trap returns anyway (so we don't actually bother to
49 test for this case).
50
51 (3) A few registers not used at all by the kernel, and so
52 normally never saved except by context-switches, are in the
53 context switch state. */
54
55 if (reg_offs == PT_CTPC || reg_offs == PT_CTPSW || reg_offs == PT_CTBP)
56 /* Register saved during context switch. */
57 regs = thread_saved_regs (t);
58 else
59 /* Register saved during kernel entry (or not available). */
60 regs = task_pt_regs (t);
61
62 return (v850_reg_t *)((char *)regs + reg_offs);
63}
64
65/* Set the bits SET and clear the bits CLEAR in the v850e DIR
66 (`debug information register'). Returns the new value of DIR. */
67static inline v850_reg_t set_dir (v850_reg_t set, v850_reg_t clear)
68{
69 register v850_reg_t rval asm ("r10");
70 register v850_reg_t arg0 asm ("r6") = set;
71 register v850_reg_t arg1 asm ("r7") = clear;
72
73 /* The dbtrap handler has exactly this functionality when called
74 from kernel mode. 0xf840 is a `dbtrap' insn. */
75 asm (".short 0xf840" : "=r" (rval) : "r" (arg0), "r" (arg1));
76
77 return rval;
78}
79
80/* Makes sure hardware single-stepping is (globally) enabled.
81 Returns true if successful. */
82static inline int enable_single_stepping (void)
83{
84 static int enabled = 0; /* Remember whether we already did it. */
85 if (! enabled) {
86 /* Turn on the SE (`single-step enable') bit, 0x100, in the
87 DIR (`debug information register'). This may fail if a
88 processor doesn't support it or something. We also try
89 to clear bit 0x40 (`INI'), which is necessary to use the
90 debug stuff on the v850e2; on the v850e, clearing 0x40
91 shouldn't cause any problem. */
92 v850_reg_t dir = set_dir (0x100, 0x40);
93 /* Make sure it really got set. */
94 if (dir & 0x100)
95 enabled = 1;
96 }
97 return enabled;
98}
99
100/* Try to set CHILD's single-step flag to VAL. Returns true if successful. */
101static int set_single_step (struct task_struct *t, int val)
102{
103 v850_reg_t *psw_addr = reg_save_addr(PT_PSW, t);
104 if (val) {
105 /* Make sure single-stepping is enabled. */
106 if (! enable_single_stepping ())
107 return 0;
108 /* Set T's single-step flag. */
109 *psw_addr |= 0x800;
110 } else
111 *psw_addr &= ~0x800;
112 return 1;
113}
114
115long arch_ptrace(struct task_struct *child, long request, long addr, long data)
116{
117 int rval;
118
119 switch (request) {
120 unsigned long val;
121
122 case PTRACE_PEEKTEXT: /* read word at location addr. */
123 case PTRACE_PEEKDATA:
124 rval = generic_ptrace_peekdata(child, addr, data);
125 goto out;
126
127 case PTRACE_POKETEXT: /* write the word at location addr. */
128 case PTRACE_POKEDATA:
129 rval = generic_ptrace_pokedata(child, addr, data);
130 goto out;
131
132 /* Read/write the word at location ADDR in the registers. */
133 case PTRACE_PEEKUSR:
134 case PTRACE_POKEUSR:
135 rval = 0;
136 if (addr >= PT_SIZE && request == PTRACE_PEEKUSR) {
137 /* Special requests that don't actually correspond
138 to offsets in struct pt_regs. */
139 if (addr == PT_TEXT_ADDR)
140 val = child->mm->start_code;
141 else if (addr == PT_DATA_ADDR)
142 val = child->mm->start_data;
143 else if (addr == PT_TEXT_LEN)
144 val = child->mm->end_code
145 - child->mm->start_code;
146 else
147 rval = -EIO;
148 } else if (addr >= 0 && addr < PT_SIZE && (addr & 0x3) == 0) {
149 v850_reg_t *reg_addr = reg_save_addr(addr, child);
150 if (request == PTRACE_PEEKUSR)
151 val = *reg_addr;
152 else
153 *reg_addr = data;
154 } else
155 rval = -EIO;
156
157 if (rval == 0 && request == PTRACE_PEEKUSR)
158 rval = put_user (val, (unsigned long *)data);
159 goto out;
160
161 /* Continue and stop at next (return from) syscall */
162 case PTRACE_SYSCALL:
163 /* Restart after a signal. */
164 case PTRACE_CONT:
165 /* Execute a single instruction. */
166 case PTRACE_SINGLESTEP:
167 rval = -EIO;
168 if (!valid_signal(data))
169 break;
170
171 /* Turn CHILD's single-step flag on or off. */
172 if (! set_single_step (child, request == PTRACE_SINGLESTEP))
173 break;
174
175 if (request == PTRACE_SYSCALL)
176 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
177 else
178 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
179
180 child->exit_code = data;
181 wake_up_process(child);
182 rval = 0;
183 break;
184
185 /*
186 * make the child exit. Best I can do is send it a sigkill.
187 * perhaps it should be put in the status that it wants to
188 * exit.
189 */
190 case PTRACE_KILL:
191 rval = 0;
192 if (child->exit_state == EXIT_ZOMBIE) /* already dead */
193 break;
194 child->exit_code = SIGKILL;
195 wake_up_process(child);
196 break;
197
198 case PTRACE_DETACH: /* detach a process that was attached. */
199 set_single_step (child, 0); /* Clear single-step flag */
200 rval = ptrace_detach(child, data);
201 break;
202
203 default:
204 rval = -EIO;
205 goto out;
206 }
207 out:
208 return rval;
209}
210
211asmlinkage void syscall_trace(void)
212{
213 if (!test_thread_flag(TIF_SYSCALL_TRACE))
214 return;
215 if (!(current->ptrace & PT_PTRACED))
216 return;
217 /* The 0x80 provides a way for the tracing parent to distinguish
218 between a syscall stop and SIGTRAP delivery */
219 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
220 ? 0x80 : 0));
221 /*
222 * this isn't the same as continuing with a signal, but it will do
223 * for normal use. strace only continues with a signal if the
224 * stopping signal is not SIGTRAP. -brl
225 */
226 if (current->exit_code) {
227 send_sig(current->exit_code, current, 1);
228 current->exit_code = 0;
229 }
230}
231
232void ptrace_disable (struct task_struct *child)
233{
234 /* nothing to do */
235}
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