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Sweden-Number/server/context_powerpc.c

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/*
* PowerPC register context support
*
* Copyright (C) 2002 Marcus Meissner, SuSE Linux AG.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#ifdef __powerpc__
#include <assert.h>
#include <errno.h>
#include <sys/types.h>
#ifdef HAVE_SYS_REG_H
# include <sys/reg.h>
#endif
#include <unistd.h>
#ifdef HAVE_SYS_PTRACE_H
# include <sys/ptrace.h>
#endif
#include "winbase.h"
#include "file.h"
#include "thread.h"
#include "request.h"
/* retrieve a thread context */
static void get_thread_context( struct thread *thread, unsigned int flags, CONTEXT *context )
{
int pid = thread->unix_pid;
if (flags & CONTEXT_FULL)
{
if (flags & CONTEXT_INTEGER)
{
#define XREG(x,y) if (ptrace( PTRACE_PEEKUSER, pid, (void*)(x<<2), &context->y) == -1) goto error;
#define IREG(x) if (ptrace( PTRACE_PEEKUSER, pid, (void*)(x<<2), &context->Gpr##x) == -1) goto error;
IREG(0); IREG(1); IREG(2); IREG(3); IREG(4); IREG(5); IREG(6);
IREG(7); IREG(8); IREG(9); IREG(10); IREG(11); IREG(12); IREG(13);
IREG(14); IREG(15); IREG(16); IREG(17); IREG(18); IREG(19);
IREG(20); IREG(21); IREG(22); IREG(23); IREG(24); IREG(25);
IREG(26); IREG(27); IREG(28); IREG(29); IREG(30); IREG(31);
#undef IREG
XREG(37,Xer);
XREG(38,Cr);
}
if (flags & CONTEXT_CONTROL)
{
XREG(32,Iar);
XREG(33,Msr);
XREG(35,Ctr);
XREG(36,Lr); /* 36 is LNK ... probably Lr ? */
}
}
if (flags & CONTEXT_FLOATING_POINT)
{
#define FREG(x) if (ptrace( PTRACE_PEEKUSER, pid, (void*)((48+x*2)<<2), &context->Fpr##x) == -1) goto error;
FREG(0);
FREG(1);
FREG(2);
FREG(3);
FREG(4);
FREG(5);
FREG(6);
FREG(7);
FREG(8);
FREG(9);
FREG(10);
FREG(11);
FREG(12);
FREG(13);
FREG(14);
FREG(15);
FREG(16);
FREG(17);
FREG(18);
FREG(19);
FREG(20);
FREG(21);
FREG(22);
FREG(23);
FREG(24);
FREG(25);
FREG(26);
FREG(27);
FREG(28);
FREG(29);
FREG(30);
FREG(31);
XREG((48+32*2),Fpscr);
}
return;
error:
file_set_error();
}
#undef XREG
#undef IREG
#undef FREG
#define XREG(x,y) if (ptrace( PTRACE_POKEUSER, pid, (void*)(x<<2), &context->y) == -1) goto error;
#define IREG(x) if (ptrace( PTRACE_POKEUSER, pid, (void*)(x<<2), &context->Gpr##x) == -1) goto error;
#define FREG(x) if (ptrace( PTRACE_POKEUSER, pid, (void*)((48+x*2)<<2), &context->Fpr##x) == -1) goto error;
/* set a thread context */
static void set_thread_context( struct thread *thread, unsigned int flags, const CONTEXT *context )
{
int pid = thread->unix_pid;
if (flags & CONTEXT_FULL)
{
if (flags & CONTEXT_INTEGER)
{
IREG(0); IREG(1); IREG(2); IREG(3); IREG(4); IREG(5); IREG(6);
IREG(7); IREG(8); IREG(9); IREG(10); IREG(11); IREG(12); IREG(13);
IREG(14); IREG(15); IREG(16); IREG(17); IREG(18); IREG(19);
IREG(20); IREG(21); IREG(22); IREG(23); IREG(24); IREG(25);
IREG(26); IREG(27); IREG(28); IREG(29); IREG(30); IREG(31);
XREG(37,Xer);
XREG(38,Cr);
}
if (flags & CONTEXT_CONTROL)
{
XREG(32,Iar);
XREG(33,Msr);
XREG(35,Ctr);
XREG(36,Lr);
}
}
if (flags & CONTEXT_FLOATING_POINT)
{
FREG(0);
FREG(1);
FREG(2);
FREG(3);
FREG(4);
FREG(5);
FREG(6);
FREG(7);
FREG(8);
FREG(9);
FREG(10);
FREG(11);
FREG(12);
FREG(13);
FREG(14);
FREG(15);
FREG(16);
FREG(17);
FREG(18);
FREG(19);
FREG(20);
FREG(21);
FREG(22);
FREG(23);
FREG(24);
FREG(25);
FREG(26);
FREG(27);
FREG(28);
FREG(29);
FREG(30);
FREG(31);
#undef FREG
XREG((48+32*2),Fpscr);
}
return;
error:
file_set_error();
}
#undef XREG
#undef IREG
#undef FREG
#define IREG(x) to->Gpr##x = from->Gpr##x;
#define FREG(x) to->Fpr##x = from->Fpr##x;
#define CREG(x) to->x = from->x;
/* copy a context structure according to the flags */
static void copy_context( CONTEXT *to, const CONTEXT *from, int flags )
{
if (flags & CONTEXT_CONTROL)
{
CREG(Msr);
CREG(Ctr);
CREG(Iar);
}
if (flags & CONTEXT_INTEGER)
{
IREG(0); IREG(1); IREG(2); IREG(3); IREG(4); IREG(5); IREG(6);
IREG(7); IREG(8); IREG(9); IREG(10); IREG(11); IREG(12); IREG(13);
IREG(14); IREG(15); IREG(16); IREG(17); IREG(18); IREG(19);
IREG(20); IREG(21); IREG(22); IREG(23); IREG(24); IREG(25);
IREG(26); IREG(27); IREG(28); IREG(29); IREG(30); IREG(31);
CREG(Xer);
CREG(Cr);
}
if (flags & CONTEXT_FLOATING_POINT)
{
FREG(0);
FREG(1);
FREG(2);
FREG(3);
FREG(4);
FREG(5);
FREG(6);
FREG(7);
FREG(8);
FREG(9);
FREG(10);
FREG(11);
FREG(12);
FREG(13);
FREG(14);
FREG(15);
FREG(16);
FREG(17);
FREG(18);
FREG(19);
FREG(20);
FREG(21);
FREG(22);
FREG(23);
FREG(24);
FREG(25);
FREG(26);
FREG(27);
FREG(28);
FREG(29);
FREG(30);
FREG(31);
CREG(Fpscr);
}
}
/* retrieve the current instruction pointer of a thread */
void *get_thread_ip( struct thread *thread )
{
CONTEXT context;
context.Iar = 0;
if (suspend_for_ptrace( thread ))
{
get_thread_context( thread, CONTEXT_CONTROL, &context );
resume_after_ptrace( thread );
}
return (void *)context.Iar;
}
/* determine if we should continue the thread in single-step mode */
int get_thread_single_step( struct thread *thread )
{
CONTEXT context;
if (thread->context) return 0;
get_thread_context( thread, CONTEXT_CONTROL, &context );
#ifndef MSR_SE
# define MSR_SE (1<<10)
#endif
return (context.Msr & MSR_SE) != 0;
}
/* retrieve the current context of a thread */
DECL_HANDLER(get_thread_context)
{
struct thread *thread;
void *data;
int flags = req->flags;
if (get_reply_max_size() < sizeof(CONTEXT))
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
if (!(thread = get_thread_from_handle( req->handle, THREAD_GET_CONTEXT ))) return;
if ((data = set_reply_data_size( sizeof(CONTEXT) )))
{
if (thread->context) /* thread is inside an exception event */
{
copy_context( data, thread->context, flags );
flags = 0;
}
if (flags && suspend_for_ptrace( thread ))
{
get_thread_context( thread, flags, data );
resume_after_ptrace( thread );
}
}
release_object( thread );
}
/* set the current context of a thread */
DECL_HANDLER(set_thread_context)
{
struct thread *thread;
int flags = req->flags;
if (get_req_data_size() < sizeof(CONTEXT))
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
if ((thread = get_thread_from_handle( req->handle, THREAD_SET_CONTEXT )))
{
if (thread->context) /* thread is inside an exception event */
{
copy_context( thread->context, get_req_data(), flags );
flags = 0;
}
if (flags && suspend_for_ptrace( thread ))
{
set_thread_context( thread, flags, get_req_data() );
resume_after_ptrace( thread );
}
release_object( thread );
}
}
#endif /* __powerpc__ */
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