mirror of
https://github.com/tobast/libunwind-eh_elf.git
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Rename: src/ia64/Gstep-ia64.c -> src/ia64/Gstep.c
(Logical change 1.241)
This commit is contained in:
homeip.net!davidm
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commit
f1734db273
1 changed files with 347 additions and 0 deletions
347
src/ia64/Gstep.c
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347
src/ia64/Gstep.c
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/* libunwind - a platform-independent unwind library
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Copyright (C) 2001-2004 Hewlett-Packard Co
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Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
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This file is part of libunwind.
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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#include "offsets.h"
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#include "unwind_i.h"
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static inline int
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linux_sigtramp (struct cursor *c, unw_word_t *num_regsp)
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{
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#if defined(UNW_LOCAL_ONLY) && !defined(__linux)
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return -UNW_EINVAL;
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#else
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unw_word_t sc_addr;
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int ret;
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if ((ret = ia64_get (c, IA64_LOC_ADDR (c->sp + 0x10
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+ LINUX_SIGFRAME_ARG2_OFF, 0),
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&sc_addr)) < 0)
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return ret;
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c->sigcontext_addr = sc_addr;
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if (!IA64_IS_REG_LOC (c->loc[IA64_REG_IP])
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&& IA64_GET_ADDR (c->loc[IA64_REG_IP]) == sc_addr + LINUX_SC_BR_OFF + 8)
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{
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/* Linux kernels before 2.4.19 and 2.5.10 had buggy
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unwind info for sigtramp. Fix it up here. */
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c->loc[IA64_REG_IP] = IA64_LOC_ADDR (sc_addr + LINUX_SC_IP_OFF, 0);
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c->cfm_loc = IA64_LOC_ADDR (sc_addr + LINUX_SC_CFM_OFF, 0);
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}
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/* do what can't be described by unwind directives: */
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c->loc[IA64_REG_PFS] = IA64_LOC_ADDR (sc_addr + LINUX_SC_AR_PFS_OFF, 0);
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*num_regsp = c->cfm & 0x7f; /* size of frame */
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return 0;
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#endif
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}
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static inline int
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linux_interrupt (struct cursor *c, unw_word_t *num_regsp, int marker)
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{
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#if defined(UNW_LOCAL_ONLY)
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/* Perhaps libunwind will some day become the Linux kernel unwinder.
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Until such time, linux_interrupt() is needed only for non-local
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unwinding. */
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return -UNW_EINVAL;
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#else
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unw_word_t sc_addr, num_regs;
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ia64_loc_t pfs_loc;
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sc_addr = c->sigcontext_addr = c->sp + 0x10;
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if ((c->pr & (1UL << LINUX_PT_P_NONSYS)) != 0)
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num_regs = c->cfm & 0x7f;
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else
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num_regs = 0;
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/* do what can't be described by unwind directives: */
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if (marker == ABI_MARKER_OLD_LINUX_INTERRUPT)
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pfs_loc = IA64_LOC_ADDR (sc_addr + LINUX_OLD_PT_PFS_OFF, 0);
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else
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pfs_loc = IA64_LOC_ADDR (sc_addr + LINUX_PT_PFS_OFF, 0);
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c->loc[IA64_REG_PFS] = pfs_loc;
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*num_regsp = num_regs; /* size of frame */
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return 0;
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#endif
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}
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static inline int
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hpux_sigtramp (struct cursor *c, unw_word_t *num_regsp)
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{
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#if defined(UNW_LOCAL_ONLY) && !defined(__hpux)
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return -UNW_EINVAL;
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#else
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unw_word_t sc_addr, bsp, bspstore;
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ia64_loc_t sc_loc;
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int ret, i;
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/* HP-UX passes the address of ucontext_t in r32: */
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if ((ret = ia64_get_stacked (c, 32, &sc_loc, NULL)) < 0)
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return ret;
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if ((ret = ia64_get (c, sc_loc, &sc_addr)) < 0)
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return ret;
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c->sigcontext_addr = sc_addr;
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/* Now mark all (preserved) registers as coming from the
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signal context: */
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c->cfm_loc = IA64_LOC_UC_REG (UNW_IA64_CFM, sc_addr);
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c->loc[IA64_REG_PRI_UNAT_MEM] = IA64_NULL_LOC;
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c->loc[IA64_REG_PSP] = IA64_LOC_UC_REG (UNW_IA64_GR + 12, sc_addr);
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c->loc[IA64_REG_BSP] = IA64_LOC_UC_REG (UNW_IA64_AR_BSP, sc_addr);
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c->loc[IA64_REG_BSPSTORE] = IA64_LOC_UC_REG (UNW_IA64_AR_BSPSTORE, sc_addr);
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c->loc[IA64_REG_PFS] = IA64_LOC_UC_REG (UNW_IA64_AR_PFS, sc_addr);
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c->loc[IA64_REG_RNAT] = IA64_LOC_UC_REG (UNW_IA64_AR_RNAT, sc_addr);
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c->loc[IA64_REG_IP] = IA64_LOC_UC_REG (UNW_IA64_IP, sc_addr);
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c->loc[IA64_REG_R4] = IA64_LOC_UC_REG (UNW_IA64_GR + 4, sc_addr);
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c->loc[IA64_REG_R5] = IA64_LOC_UC_REG (UNW_IA64_GR + 5, sc_addr);
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c->loc[IA64_REG_R6] = IA64_LOC_UC_REG (UNW_IA64_GR + 6, sc_addr);
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c->loc[IA64_REG_R7] = IA64_LOC_UC_REG (UNW_IA64_GR + 7, sc_addr);
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c->loc[IA64_REG_NAT4] = IA64_LOC_UC_REG (UNW_IA64_NAT + 4, sc_addr);
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c->loc[IA64_REG_NAT5] = IA64_LOC_UC_REG (UNW_IA64_NAT + 5, sc_addr);
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c->loc[IA64_REG_NAT6] = IA64_LOC_UC_REG (UNW_IA64_NAT + 6, sc_addr);
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c->loc[IA64_REG_NAT7] = IA64_LOC_UC_REG (UNW_IA64_NAT + 7, sc_addr);
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c->loc[IA64_REG_UNAT] = IA64_LOC_UC_REG (UNW_IA64_AR_UNAT, sc_addr);
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c->loc[IA64_REG_PR] = IA64_LOC_UC_REG (UNW_IA64_PR, sc_addr);
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c->loc[IA64_REG_LC] = IA64_LOC_UC_REG (UNW_IA64_AR_LC, sc_addr);
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c->loc[IA64_REG_FPSR] = IA64_LOC_UC_REG (UNW_IA64_AR_FPSR, sc_addr);
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c->loc[IA64_REG_B1] = IA64_LOC_UC_REG (UNW_IA64_BR + 1, sc_addr);
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c->loc[IA64_REG_B2] = IA64_LOC_UC_REG (UNW_IA64_BR + 2, sc_addr);
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c->loc[IA64_REG_B3] = IA64_LOC_UC_REG (UNW_IA64_BR + 3, sc_addr);
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c->loc[IA64_REG_B4] = IA64_LOC_UC_REG (UNW_IA64_BR + 4, sc_addr);
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c->loc[IA64_REG_B5] = IA64_LOC_UC_REG (UNW_IA64_BR + 5, sc_addr);
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c->loc[IA64_REG_F2] = IA64_LOC_UC_REG (UNW_IA64_FR + 2, sc_addr);
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c->loc[IA64_REG_F3] = IA64_LOC_UC_REG (UNW_IA64_FR + 3, sc_addr);
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c->loc[IA64_REG_F4] = IA64_LOC_UC_REG (UNW_IA64_FR + 4, sc_addr);
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c->loc[IA64_REG_F5] = IA64_LOC_UC_REG (UNW_IA64_FR + 5, sc_addr);
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for (i = 0; i < 16; ++i)
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c->loc[IA64_REG_F16 + i] = IA64_LOC_UC_REG (UNW_IA64_FR + 16 + i, sc_addr);
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c->pi.flags |= UNW_PI_FLAG_IA64_RBS_SWITCH;
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/* update the CFM cache: */
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if ((ret = ia64_get (c, c->cfm_loc, &c->cfm)) < 0)
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return ret;
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/* update the PSP cache: */
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if ((ret = ia64_get (c, c->loc[IA64_REG_PSP], &c->psp)) < 0)
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return ret;
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if ((ret = ia64_get (c, c->loc[IA64_REG_BSP], &bsp)) < 0
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|| (ret = ia64_get (c, c->loc[IA64_REG_BSPSTORE], &bspstore)) < 0)
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return ret;
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if (bspstore < bsp)
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/* Dirty partition got spilled into the ucontext_t structure
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itself. We'll need to access it via uc_access(3). */
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rbs_switch (c, bsp, bspstore, IA64_LOC_UC_ADDR (bsp | 0x1f8, 0));
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*num_regsp = 0;
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return 0;
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#endif
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}
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static inline int
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check_rbs_switch (struct cursor *c)
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{
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unw_word_t saved_bsp, saved_bspstore, loadrs, ndirty;
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int ret = 0;
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saved_bsp = c->bsp;
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if (c->pi.flags & UNW_PI_FLAG_IA64_RBS_SWITCH)
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{
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/* Got ourselves a frame that has saved ar.bspstore, ar.bsp,
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and ar.rnat, so we're all set for rbs-switching: */
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if ((ret = ia64_get (c, c->loc[IA64_REG_BSP], &saved_bsp)) < 0
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|| (ret = ia64_get (c, c->loc[IA64_REG_BSPSTORE], &saved_bspstore)))
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return ret;
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}
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else if ((c->abi_marker == ABI_MARKER_LINUX_SIGTRAMP
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|| c->abi_marker == ABI_MARKER_OLD_LINUX_SIGTRAMP)
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&& !IA64_IS_REG_LOC (c->loc[IA64_REG_BSP])
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&& (IA64_GET_ADDR (c->loc[IA64_REG_BSP])
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== c->sigcontext_addr + LINUX_SC_AR_BSP_OFF))
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{
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/* When Linux delivers a signal on an alternate stack, it
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does things a bit differently from what the unwind
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conventions allow us to describe: instead of saving
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ar.rnat, ar.bsp, and ar.bspstore, it saves the former two
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plus the "loadrs" value. Because of this, we need to
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detect & record a potential rbs-area switch
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manually... */
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/* If ar.bsp has been saved already AND the current bsp is
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not equal to the saved value, then we know for sure that
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we're past the point where the backing store has been
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switched (and before the point where it's restored). */
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if ((ret = ia64_get (c, IA64_LOC_ADDR (c->sigcontext_addr
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+ LINUX_SC_AR_BSP_OFF, 0),
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&saved_bsp) < 0)
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|| (ret = ia64_get (c, IA64_LOC_ADDR (c->sigcontext_addr
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+ LINUX_SC_LOADRS_OFF, 0),
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&loadrs) < 0))
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return ret;
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loadrs >>= 16;
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ndirty = ia64_rse_num_regs (c->bsp - loadrs, c->bsp);
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saved_bspstore = ia64_rse_skip_regs (saved_bsp, -ndirty);
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}
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if (saved_bsp == c->bsp)
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return 0;
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return rbs_switch (c, saved_bsp, saved_bspstore, c->loc[IA64_REG_RNAT]);
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}
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static inline int
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update_frame_state (struct cursor *c)
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{
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unw_word_t prev_ip, prev_sp, prev_bsp, ip, num_regs;
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int ret;
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prev_ip = c->ip;
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prev_sp = c->sp;
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prev_bsp = c->bsp;
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/* Update the IP cache (do this first: if we reach the end of the
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frame-chain, the rest of the info may not be valid/useful
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anymore. */
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ret = ia64_get (c, c->loc[IA64_REG_IP], &ip);
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if (ret < 0)
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return ret;
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c->ip = ip;
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if ((ip & 0xc) != 0)
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{
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/* don't let obviously bad addresses pollute the cache */
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Debug (1, "rejecting bad ip=0x%lx\n", (long) c->ip);
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return -UNW_EINVALIDIP;
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}
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if (ip == 0)
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/* end of frame-chain reached */
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return 0;
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c->cfm_loc = c->loc[IA64_REG_PFS];
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/* update the CFM cache: */
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ret = ia64_get (c, c->cfm_loc, &c->cfm);
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if (ret < 0)
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return ret;
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num_regs = 0;
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if (unlikely (c->abi_marker))
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{
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c->last_abi_marker = c->abi_marker;
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switch (c->abi_marker)
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{
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case ABI_MARKER_LINUX_SIGTRAMP:
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case ABI_MARKER_OLD_LINUX_SIGTRAMP:
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c->as->abi = ABI_LINUX;
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if ((ret = linux_sigtramp (c, &num_regs)) < 0)
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return ret;
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break;
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case ABI_MARKER_OLD_LINUX_INTERRUPT:
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case ABI_MARKER_LINUX_INTERRUPT:
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c->as->abi = ABI_LINUX;
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if ((ret = linux_interrupt (c, &num_regs, c->abi_marker)) < 0)
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return ret;
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break;
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case ABI_MARKER_HP_UX_SIGTRAMP:
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c->as->abi = ABI_HPUX;
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if ((ret = hpux_sigtramp (c, &num_regs)) < 0)
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return ret;
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break;
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default:
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Debug (1, "unknown ABI marker: ABI=%u, context=%u\n",
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c->abi_marker >> 8, c->abi_marker & 0xff);
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return -UNW_EINVAL;
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}
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Debug (12, "sigcontext_addr=%lx (ret=%d)\n",
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(unsigned long) c->sigcontext_addr, ret);
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c->sigcontext_off = c->sigcontext_addr - c->sp;
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/* update the IP cache: */
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if ((ret = ia64_get (c, c->loc[IA64_REG_IP], &ip)) < 0)
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return ret;
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c->ip = ip;
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if (ip == 0)
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/* end of frame-chain reached */
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return 0;
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}
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else
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num_regs = (c->cfm >> 7) & 0x7f; /* size of locals */
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if (!IA64_IS_NULL_LOC (c->loc[IA64_REG_BSP]))
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{
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ret = check_rbs_switch (c);
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if (ret < 0)
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return ret;
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}
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c->bsp = ia64_rse_skip_regs (c->bsp, -num_regs);
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c->sp = c->psp;
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c->abi_marker = 0;
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if (c->ip == prev_ip && c->sp == prev_sp && c->bsp == prev_bsp)
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{
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dprintf ("%s: ip, sp, and bsp unchanged; stopping here (ip=0x%lx)\n",
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__FUNCTION__, (long) ip);
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return -UNW_EBADFRAME;
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}
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/* as we unwind, the saved ar.unat becomes the primary unat: */
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c->loc[IA64_REG_PRI_UNAT_MEM] = c->loc[IA64_REG_UNAT];
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/* restore the predicates: */
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ret = ia64_get (c, c->loc[IA64_REG_PR], &c->pr);
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if (ret < 0)
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return ret;
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c->pi_valid = 0;
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return 0;
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}
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PROTECTED int
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unw_step (unw_cursor_t *cursor)
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{
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struct cursor *c = (struct cursor *) cursor;
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int ret;
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Debug (2, "(cursor=%p)\n", c);
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ret = ia64_find_save_locs (c);
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if (ret < 0)
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return ret;
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ret = update_frame_state (c);
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if (ret < 0)
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return ret;
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return (c->ip == 0) ? 0 : 1;
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}
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