kgdb.c (82ffd0454bd9bd57780966d47bfd56d579dd4fb3) kgdb.c (ed1cd6deb013a11959d17a94e35ce159197632da)
1/*
2 * PowerPC backend to the KGDB stub.
3 *
4 * 1998 (c) Michael AK Tesch (tesch@cs.wisc.edu)
5 * Copyright (C) 2003 Timesys Corporation.
6 * Copyright (C) 2004-2006 MontaVista Software, Inc.
7 * PPC64 Mods (C) 2005 Frank Rowand (frowand@mvista.com)
8 * PPC32 support restored by Vitaly Wool <vwool@ru.mvista.com> and

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146 return 0;
147
148 if (*(u32 *)regs->nip == BREAK_INSTR)
149 regs->nip += BREAK_INSTR_SIZE;
150
151 return 1;
152}
153
1/*
2 * PowerPC backend to the KGDB stub.
3 *
4 * 1998 (c) Michael AK Tesch (tesch@cs.wisc.edu)
5 * Copyright (C) 2003 Timesys Corporation.
6 * Copyright (C) 2004-2006 MontaVista Software, Inc.
7 * PPC64 Mods (C) 2005 Frank Rowand (frowand@mvista.com)
8 * PPC32 support restored by Vitaly Wool <vwool@ru.mvista.com> and

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146 return 0;
147
148 if (*(u32 *)regs->nip == BREAK_INSTR)
149 regs->nip += BREAK_INSTR_SIZE;
150
151 return 1;
152}
153
154static DEFINE_PER_CPU(struct thread_info, kgdb_thread_info);
155static int kgdb_singlestep(struct pt_regs *regs)
156{
154static int kgdb_singlestep(struct pt_regs *regs)
155{
157 struct thread_info *thread_info, *exception_thread_info;
158 struct thread_info *backup_current_thread_info =
159 this_cpu_ptr(&kgdb_thread_info);
160
161 if (user_mode(regs))
162 return 0;
163
156 if (user_mode(regs))
157 return 0;
158
164 /*
165 * On Book E and perhaps other processors, singlestep is handled on
166 * the critical exception stack. This causes current_thread_info()
167 * to fail, since it it locates the thread_info by masking off
168 * the low bits of the current stack pointer. We work around
169 * this issue by copying the thread_info from the kernel stack
170 * before calling kgdb_handle_exception, and copying it back
171 * afterwards. On most processors the copy is avoided since
172 * exception_thread_info == thread_info.
173 */
174 thread_info = (struct thread_info *)(regs->gpr[1] & ~(THREAD_SIZE-1));
175 exception_thread_info = current_thread_info();
176
177 if (thread_info != exception_thread_info) {
178 /* Save the original current_thread_info. */
179 memcpy(backup_current_thread_info, exception_thread_info, sizeof *thread_info);
180 memcpy(exception_thread_info, thread_info, sizeof *thread_info);
181 }
182
183 kgdb_handle_exception(0, SIGTRAP, 0, regs);
184
159 kgdb_handle_exception(0, SIGTRAP, 0, regs);
160
185 if (thread_info != exception_thread_info)
186 /* Restore current_thread_info lastly. */
187 memcpy(exception_thread_info, backup_current_thread_info, sizeof *thread_info);
188
189 return 1;
190}
191
192static int kgdb_iabr_match(struct pt_regs *regs)
193{
194 if (user_mode(regs))
195 return 0;
196

--- 329 unchanged lines hidden --- 		161 return 1;
162}
163
164static int kgdb_iabr_match(struct pt_regs *regs)
165{
166 if (user_mode(regs))
167 return 0;
168

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