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2004/01/27 21:49:09-08:00 hp.com!davidm
Rename: src/_UPT_access_reg.c -> src/ptrace/_UPT_access_reg.c

(Logical change 1.162)
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hp.com!davidm 2004-01-30 00:01:24 +00:00
parent 3152b04bb4
commit c5a37d6efc
1 changed files with 251 additions and 0 deletions
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src/ptrace/_UPT_access_reg.c
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/* libunwind - a platform-independent unwind library
Copyright (C) 2003-2004 Hewlett-Packard Co
Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
This file is part of libunwind.
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
#include "_UPT_internal.h"
#if UNW_TARGET_IA64
# include <elf.h>
# ifdef HAVE_ASM_PTRACE_OFFSETS_H
# include <asm/ptrace_offsets.h>
# endif
# include "ia64/rse.h"
#endif
int
_UPT_access_reg (unw_addr_space_t as, unw_regnum_t reg, unw_word_t *val,
int write, void *arg)
{
struct UPT_info *ui = arg;
pid_t pid = ui->pid;
#if UNW_DEBUG
if (write)
Debug (16, "%s <- %lx\n", unw_regname (reg), (long) *val);
#endif
#if UNW_TARGET_IA64
if ((unsigned) reg - UNW_IA64_NAT < 32)
{
unsigned long nat_bits, mask;
/* The Linux ptrace represents the statc NaT bits as a single word. */
mask = ((unw_word_t) 1) << (reg - UNW_IA64_NAT);
errno = 0;
#ifdef HAVE_TTRACE
# warning No support for ttrace() yet.
#else
nat_bits = ptrace (PTRACE_PEEKUSER, pid, PT_NAT_BITS, 0);
if (errno)
goto badreg;
#endif
if (write)
{
if (*val)
nat_bits |= mask;
else
nat_bits &= ~mask;
#ifdef HAVE_TTRACE
# warning No support for ttrace() yet.
#else
errno = 0;
ptrace (PTRACE_POKEUSER, pid, PT_NAT_BITS, nat_bits);
if (errno)
goto badreg;
#endif
}
goto out;
}
else
switch (reg)
{
case UNW_IA64_GR + 0:
if (write)
goto badreg;
*val = 0;
return 0;
case UNW_REG_IP:
{
unsigned long ip, psr;
/* distribute bundle-addr. & slot-number across PT_IIP & PT_IPSR. */
#ifdef HAVE_TTRACE
# warning No support for ttrace() yet.
#else
errno = 0;
psr = ptrace (PTRACE_PEEKUSER, pid, PT_CR_IPSR, 0);
if (errno)
goto badreg;
#endif
if (write)
{
ip = *val & ~0xfUL;
psr = (psr & ~0x3UL << 41) | (*val & 0x3);
#ifdef HAVE_TTRACE
# warning No support for ttrace() yet.
#else
errno = 0;
ptrace (PTRACE_POKEUSER, pid, PT_CR_IIP, ip);
ptrace (PTRACE_POKEUSER, pid, PT_CR_IPSR, psr);
if (errno)
goto badreg;
#endif
}
else
{
#ifdef HAVE_TTRACE
# warning No support for ttrace() yet.
#else
errno = 0;
ip = ptrace (PTRACE_PEEKUSER, pid, PT_CR_IIP, 0);
if (errno)
goto badreg;
#endif
*val = ip + ((psr >> 41) & 0x3);
}
goto out;
}
case UNW_IA64_AR_BSPSTORE:
reg = UNW_IA64_AR_BSP;
break;
case UNW_IA64_AR_BSP:
case UNW_IA64_BSP:
{
unsigned long sof, cfm, bsp;
#ifdef HAVE_TTRACE
# warning No support for ttrace() yet.
#else
/* Account for the fact that ptrace() expects bsp to point
_after_ the current register frame. */
errno = 0;
cfm = ptrace (PTRACE_PEEKUSER, pid, PT_CFM, 0);
if (errno)
goto badreg;
#endif
sof = (cfm & 0x7f);
if (write)
{
bsp = ia64_rse_skip_regs (*val, sof);
#ifdef HAVE_TTRACE
# warning No support for ttrace() yet.
#else
errno = 0;
ptrace (PTRACE_POKEUSER, pid, PT_AR_BSP, bsp);
if (errno)
goto badreg;
#endif
}
else
{
#ifdef HAVE_TTRACE
# warning No support for ttrace() yet.
#else
errno = 0;
bsp = ptrace (PTRACE_PEEKUSER, pid, PT_AR_BSP, 0);
if (errno)
goto badreg;
#endif
*val = ia64_rse_skip_regs (bsp, -sof);
}
goto out;
}
case UNW_IA64_CFM:
/* If we change CFM, we need to adjust ptrace's notion of bsp
accordingly, so that the real bsp remains unchanged. */
if (write)
{
unsigned long new_sof, old_sof, cfm, bsp;
#ifdef HAVE_TTRACE
# warning No support for ttrace() yet.
#else
errno = 0;
bsp = ptrace (PTRACE_PEEKUSER, pid, PT_AR_BSP, 0);
cfm = ptrace (PTRACE_PEEKUSER, pid, PT_CFM, 0);
#endif
if (errno)
goto badreg;
old_sof = (cfm & 0x7f);
new_sof = (*val & 0x7f);
if (old_sof != new_sof)
{
bsp = ia64_rse_skip_regs (bsp, -old_sof + new_sof);
#ifdef HAVE_TTRACE
# warning No support for ttrace() yet.
#else
errno = 0;
ptrace (PTRACE_POKEUSER, pid, PT_AR_BSP, 0);
if (errno)
goto badreg;
#endif
}
#ifdef HAVE_TTRACE
# warning No support for ttrace() yet.
#else
errno = 0;
ptrace (PTRACE_POKEUSER, pid, PT_CFM, *val);
if (errno)
goto badreg;
#endif
goto out;
}
break;
}
#endif
if ((unsigned) reg >= sizeof (_UPT_reg_offset) / sizeof (_UPT_reg_offset[0]))
goto badreg;
#ifdef HAVE_TTRACE
# warning No support for ttrace() yet.
#else
errno = 0;
if (write)
ptrace (PTRACE_POKEUSER, pid, _UPT_reg_offset[reg], *val);
else
*val = ptrace (PTRACE_PEEKUSER, pid, _UPT_reg_offset[reg], 0);
if (errno)
goto badreg;
#endif
#ifdef UNW_TARGET_IA64
out:
#endif
#if UNW_DEBUG
if (!write)
Debug (16, "%s -> %lx\n", unw_regname (reg), (long) *val);
#endif
return 0;
badreg:
Debug (1, "bad register number %u\n", reg);
return -UNW_EBADREG;
}