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(unw_resume): Reject attempts to resume execution at IP 0.
2004/12/02 18:37:47-08:00 hp.com!davidm (my_rt_sigreturn): New function. 2004/12/02 00:40:45-08:00 mostang.com!davidm (Logical change 1.290)
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1 changed files with 145 additions and 0 deletions
145
src/hppa/Gresume.c
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145
src/hppa/Gresume.c
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/* libunwind - a platform-independent unwind library
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Copyright (c) 2004 Hewlett-Packard Development Company, L.P.
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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 <stdlib.h>
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#include "unwind_i.h"
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#ifndef UNW_REMOTE_ONLY
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#if defined(__linux)
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# include <sys/syscall.h>
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static NORETURN inline long
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my_rt_sigreturn (void *new_sp, int in_syscall)
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{
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register unsigned long r25 __asm__ ("r25") = (in_syscall != 0);
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register unsigned long r20 __asm__ ("r20") = SYS_rt_sigreturn;
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__asm__ __volatile__ ("copy %0, %%sp\n"
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"be,l 0x100(%%sr2,%%r0),%%sr0,%%r31\n"
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"nop"
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:
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: "r"(new_sp), "r"(r20), "r"(r25)
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: "memory");
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abort ();
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}
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#endif /* __linux */
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HIDDEN inline int
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hppa_local_resume (unw_addr_space_t as, unw_cursor_t *cursor, void *arg)
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{
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#if defined(__linux)
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struct cursor *c = (struct cursor *) cursor;
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ucontext_t *uc = c->dwarf.as_arg;
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/* Ensure c->pi is up-to-date. On PA-RISC, it's relatively common to be
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missing DWARF unwind info. We don't want to fail in that case,
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because the frame-chain still would let us do a backtrace at
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least. */
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dwarf_make_proc_info (&c->dwarf);
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if (unlikely (c->sigcontext_format != HPPA_SCF_NONE))
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{
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struct sigcontext *sc = (struct sigcontext *) c->sigcontext_addr;
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Debug (8, "resuming at ip=%x via sigreturn(%p)\n", c->dwarf.ip, sc);
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my_rt_sigreturn (sc, (sc->sc_flags & PARISC_SC_FLAG_IN_SYSCALL) != 0);
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}
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else
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{
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Debug (8, "resuming at ip=%x via setcontext()\n", c->dwarf.ip);
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setcontext (uc);
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}
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#else
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# warning Implement me!
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#endif
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return -UNW_EINVAL;
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}
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#endif /* !UNW_REMOTE_ONLY */
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/* This routine is responsible for copying the register values in
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cursor C and establishing them as the current machine state. */
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static inline int
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establish_machine_state (struct cursor *c)
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{
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int (*access_reg) (unw_addr_space_t, unw_regnum_t, unw_word_t *,
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int write, void *);
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int (*access_fpreg) (unw_addr_space_t, unw_regnum_t, unw_fpreg_t *,
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int write, void *);
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unw_addr_space_t as = c->dwarf.as;
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void *arg = c->dwarf.as_arg;
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unw_fpreg_t fpval;
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unw_word_t val;
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int reg;
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access_reg = as->acc.access_reg;
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access_fpreg = as->acc.access_fpreg;
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Debug (8, "copying out cursor state\n");
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for (reg = 0; reg <= UNW_REG_LAST; ++reg)
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{
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Debug (16, "copying %s %d\n", unw_regname (reg), reg);
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if (unw_is_fpreg (reg))
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{
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if (tdep_access_fpreg (c, reg, &fpval, 0) >= 0)
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(*access_fpreg) (as, reg, &fpval, 1, arg);
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}
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else
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{
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if (tdep_access_reg (c, reg, &val, 0) >= 0)
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(*access_reg) (as, reg, &val, 1, arg);
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}
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}
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return 0;
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}
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PROTECTED int
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unw_resume (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 (1, "(cursor=%p)\n", c);
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if (!c->dwarf.ip)
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{
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/* This can happen easily when the frame-chain gets truncated
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due to bad or missing unwind-info. */
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Debug (1, "refusing to resume execution at address 0\n");
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return -UNW_EINVAL;
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}
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if ((ret = establish_machine_state (c)) < 0)
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return ret;
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return (*c->dwarf.as->acc.resume) (c->dwarf.as, (unw_cursor_t *) c,
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c->dwarf.as_arg);
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}
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