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- /* libunwind - a platform-independent unwind library
- Copyright (C) 2003-2005 Hewlett-Packard Co
- Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
- Copyright (C) 2010 Konstantin Belousov <kib@freebsd.org>
- 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 "tdep-ia64/rse.h"
- #endif
- #if HAVE_DECL_PTRACE_POKEUSER || HAVE_TTRACE
- 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 = 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 = 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 = 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]))
- {
- errno = EINVAL;
- 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 (error: %s)\n", reg, strerror (errno));
- return -UNW_EBADREG;
- }
- #elif HAVE_DECL_PT_GETREGS
- 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;
- gregset_t regs;
- char *r;
- #if UNW_DEBUG
- if (write)
- Debug (16, "%s <- %lx\n", unw_regname (reg), (long) *val);
- #endif
- if ((unsigned) reg >= sizeof (_UPT_reg_offset) / sizeof (_UPT_reg_offset[0]))
- {
- errno = EINVAL;
- goto badreg;
- }
- r = (char *)®s + _UPT_reg_offset[reg];
- if (ptrace(PT_GETREGS, pid, (caddr_t)®s, 0) == -1)
- goto badreg;
- if (write) {
- memcpy(r, val, sizeof(unw_word_t));
- if (ptrace(PT_SETREGS, pid, (caddr_t)®s, 0) == -1)
- goto badreg;
- } else
- memcpy(val, r, sizeof(unw_word_t));
- return 0;
- badreg:
- Debug (1, "bad register number %u (error: %s)\n", reg, strerror (errno));
- return -UNW_EBADREG;
- }
- #else
- #error Port me
- #endif
|