context_powerpc.c 6.47 KB
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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
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 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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 */

#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
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#include <stdarg.h>
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#include <unistd.h>
#ifdef HAVE_SYS_PTRACE_H
# include <sys/ptrace.h>
#endif

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#include "windef.h"

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#if 0  /* no longer used */

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#ifndef PTRACE_PEEKUSER
# ifdef PT_READ_D
#  define PTRACE_PEEKUSER PT_READ_D
# endif
#endif /* PTRACE_PEEKUSER */

#ifndef PTRACE_POKEUSER
# ifdef PT_WRITE_D
#  define PTRACE_POKEUSER PT_WRITE_D
# endif
#endif /* PTRACE_POKEUSER */

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#include "file.h"
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#include "thread.h"
#include "request.h"

/* retrieve a thread context */
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static void get_thread_context_ptrace( struct thread *thread, unsigned int flags, CONTEXT *context )
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{
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    int pid = get_ptrace_pid(thread);
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    if (flags & CONTEXT_INTEGER)
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    {
#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;
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        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);
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#undef IREG
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        XREG(37,Xer);
        XREG(38,Cr);
        context->ContextFlags |= CONTEXT_INTEGER;
    }
    if (flags & CONTEXT_CONTROL)
    {
        XREG(32,Iar);
        XREG(33,Msr);
        XREG(35,Ctr);
        XREG(36,Lr); /* 36 is LNK ... probably Lr ? */
        context->ContextFlags |= CONTEXT_CONTROL;
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    }
    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);
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        context->ContextFlags |= CONTEXT_FLOATING_POINT;
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    }
    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 */
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static void set_thread_context_ptrace( struct thread *thread, unsigned int flags, const CONTEXT *context )
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{
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    int pid = get_ptrace_pid(thread);
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    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)
        {
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	    XREG(32,Iar);
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	    XREG(33,Msr);
	    XREG(35,Ctr);
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	    XREG(36,Lr);
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        }
    }
    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

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#endif /* 0 */

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#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 */
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void copy_context( CONTEXT *to, const CONTEXT *from, unsigned int flags )
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{
    if (flags & CONTEXT_CONTROL)
    {
    	CREG(Msr);
    	CREG(Ctr);
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    	CREG(Iar);
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        to->ContextFlags |= CONTEXT_CONTROL;
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    }
    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);
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        to->ContextFlags |= CONTEXT_INTEGER;
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    }
    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);
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        to->ContextFlags |= CONTEXT_FLOATING_POINT;
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    }
}

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/* retrieve the current instruction pointer of a context */
void *get_context_ip( const CONTEXT *context )
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{
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    return (void *)context->Iar;
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}

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/* return the context flag that contains the CPU id */
unsigned int get_context_cpu_flag(void)
{
    return 0;
}

/* return only the context flags that correspond to system regs */
/* (system regs are the ones we can't access on the client side) */
unsigned int get_context_system_regs( unsigned int flags )
{
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    return 0;  /* FIXME: implement client-side handling */
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}

#endif  /* __powerpc__ */