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e6b9f350f7
routine and add address-space argument. This is needed because on PPC64, a the function-name symbol refers to a function descriptor (unlike, for example, on ia64, where the @fptr() operator is needed to refer to a function descriptor). Thus, in order to look up the name of a function, we need to dereference the function descriptor. To make matters more "interesting", the function descriptors are normally resolved by the dynamic linker, so we can't get their values from the ELF file. Instead, we have to read them from the running image, hence the need for the address-space argument.
230 lines
5.6 KiB
C
230 lines
5.6 KiB
C
/* libunwind - a platform-independent unwind library
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Copyright (C) 2006-2007 IBM
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Contributed by
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Corey Ashford <cjashfor@us.ibm.com>
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Jose Flavio Aguilar Paulino <jflavio@br.ibm.com> <joseflavio@gmail.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 <string.h>
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#include "ucontext_i.h"
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#include "unwind_i.h"
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#ifdef UNW_REMOTE_ONLY
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/* unw_local_addr_space is a NULL pointer in this case. */
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PROTECTED unw_addr_space_t unw_local_addr_space;
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#else /* !UNW_REMOTE_ONLY */
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static struct unw_addr_space local_addr_space;
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PROTECTED unw_addr_space_t unw_local_addr_space = &local_addr_space;
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#define PAGE_SIZE 4096
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#define PAGE_START(a) ((a) & ~(PAGE_SIZE-1))
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static void *
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uc_addr (ucontext_t *uc, int reg)
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{
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void *addr;
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if ((unsigned) (reg - UNW_PPC64_R0) < 32)
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addr = &uc->uc_mcontext.gp_regs[reg - UNW_PPC64_R0];
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else if ((unsigned) (reg - UNW_PPC64_F0) < 32)
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addr = &uc->uc_mcontext.fp_regs[reg - UNW_PPC64_F0];
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else if ((unsigned) (reg - UNW_PPC64_V0) < 32)
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addr = (uc->uc_mcontext.v_regs == 0) ? NULL : &uc->uc_mcontext.v_regs->vrregs[reg - UNW_PPC64_V0][0];
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else
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{
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unsigned gregs_idx;
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switch (reg)
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{
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case UNW_PPC64_NIP:
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gregs_idx = NIP_IDX;
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break;
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case UNW_PPC64_CTR:
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gregs_idx = CTR_IDX;
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break;
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case UNW_PPC64_LR:
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gregs_idx = LINK_IDX;
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break;
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case UNW_PPC64_XER:
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gregs_idx = XER_IDX;
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break;
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case UNW_PPC64_CR0:
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gregs_idx = CCR_IDX;
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break;
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default:
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return NULL;
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}
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addr = &uc->uc_mcontext.gp_regs[gregs_idx];
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}
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return addr;
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}
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# ifdef UNW_LOCAL_ONLY
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HIDDEN void *
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tdep_uc_addr (ucontext_t *uc, int reg)
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{
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return uc_addr (uc, reg);
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}
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# endif /* UNW_LOCAL_ONLY */
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HIDDEN unw_dyn_info_list_t _U_dyn_info_list;
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static void
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put_unwind_info (unw_addr_space_t as, unw_proc_info_t *proc_info, void *arg)
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{
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/* it's a no-op */
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}
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static int
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get_dyn_info_list_addr (unw_addr_space_t as, unw_word_t *dyn_info_list_addr,
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void *arg)
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{
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*dyn_info_list_addr = (unw_word_t) &_U_dyn_info_list;
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return 0;
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}
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static int
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access_mem (unw_addr_space_t as, unw_word_t addr, unw_word_t *val, int write,
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void *arg)
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{
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if (write)
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{
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Debug (12, "mem[%lx] <- %lx\n", addr, *val);
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*(unw_word_t *) addr = *val;
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}
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else
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{
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*val = *(unw_word_t *) addr;
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Debug (12, "mem[%lx] -> %lx\n", addr, *val);
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}
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return 0;
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}
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static int
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access_reg (unw_addr_space_t as, unw_regnum_t reg, unw_word_t *val,
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int write, void *arg)
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{
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unw_word_t *addr;
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ucontext_t *uc = arg;
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if ((unsigned int) (reg - UNW_PPC64_F0) < 32)
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goto badreg;
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if ((unsigned int) (reg - UNW_PPC64_V0) < 32)
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goto badreg;
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addr = uc_addr (uc, reg);
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if (!addr)
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goto badreg;
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if (write)
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{
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*(unw_word_t *) addr = *val;
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Debug (12, "%s <- %lx\n", unw_regname (reg), *val);
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}
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else
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{
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*val = *(unw_word_t *) addr;
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Debug (12, "%s -> %lx\n", unw_regname (reg), *val);
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}
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return 0;
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badreg:
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Debug (1, "bad register number %u\n", reg);
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return -UNW_EBADREG;
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}
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static int
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access_fpreg (unw_addr_space_t as, unw_regnum_t reg, unw_fpreg_t *val,
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int write, void *arg)
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{
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ucontext_t *uc = arg;
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unw_fpreg_t *addr;
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if ((unsigned) (reg - UNW_PPC64_F0) < 0)
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goto badreg;
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if ((unsigned) (reg - UNW_PPC64_V0) >= 32)
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goto badreg;
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addr = uc_addr (uc, reg);
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if (!addr)
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goto badreg;
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if (write)
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{
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Debug (12, "%s <- %016Lf\n", unw_regname (reg), *val);
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*(unw_fpreg_t *) addr = *val;
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}
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else
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{
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*val = *(unw_fpreg_t *) addr;
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Debug (12, "%s -> %016Lf\n", unw_regname (reg), *val);
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}
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return 0;
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badreg:
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Debug (1, "bad register number %u\n", reg);
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/* attempt to access a non-preserved register */
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return -UNW_EBADREG;
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}
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static int
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get_static_proc_name (unw_addr_space_t as, unw_word_t ip,
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char *buf, size_t buf_len, unw_word_t *offp,
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void *arg)
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{
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return _Uelf64_get_proc_name (as, getpid (), ip, buf, buf_len, offp);
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}
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HIDDEN void
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ppc64_local_addr_space_init (void)
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{
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memset (&local_addr_space, 0, sizeof (local_addr_space));
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local_addr_space.caching_policy = UNW_CACHE_GLOBAL;
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local_addr_space.acc.find_proc_info = dwarf_find_proc_info;
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local_addr_space.acc.put_unwind_info = put_unwind_info;
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local_addr_space.acc.get_dyn_info_list_addr = get_dyn_info_list_addr;
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local_addr_space.acc.access_mem = access_mem;
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local_addr_space.acc.access_reg = access_reg;
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local_addr_space.acc.access_fpreg = access_fpreg;
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local_addr_space.acc.resume = ppc64_local_resume;
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local_addr_space.acc.get_proc_name = get_static_proc_name;
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unw_flush_cache (&local_addr_space, 0, 0);
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}
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#endif /* !UNW_REMOTE_ONLY */
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