diff options
Diffstat (limited to 'src/third_party/unwind/dist/src/x86/Ginit.c')
-rw-r--r-- | src/third_party/unwind/dist/src/x86/Ginit.c | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/src/third_party/unwind/dist/src/x86/Ginit.c b/src/third_party/unwind/dist/src/x86/Ginit.c new file mode 100644 index 00000000000..f6b8dc27d49 --- /dev/null +++ b/src/third_party/unwind/dist/src/x86/Ginit.c @@ -0,0 +1,243 @@ +/* libunwind - a platform-independent unwind library + Copyright (C) 2002 Hewlett-Packard Co + Copyright (C) 2007 David Mosberger-Tang + Contributed by David Mosberger-Tang <dmosberger@gmail.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. */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <stdlib.h> +#include <string.h> + +#include "unwind_i.h" + +#ifdef UNW_REMOTE_ONLY + +/* unw_local_addr_space is a NULL pointer in this case. */ +unw_addr_space_t unw_local_addr_space; + +#else /* !UNW_REMOTE_ONLY */ + +static struct unw_addr_space local_addr_space; + +unw_addr_space_t unw_local_addr_space = &local_addr_space; + +# ifdef UNW_LOCAL_ONLY + +HIDDEN void * +tdep_uc_addr (ucontext_t *uc, int reg) +{ + return x86_r_uc_addr (uc, reg); +} + +# endif /* UNW_LOCAL_ONLY */ + +HIDDEN unw_dyn_info_list_t _U_dyn_info_list; + +/* XXX fix me: there is currently no way to locate the dyn-info list + by a remote unwinder. On ia64, this is done via a special + unwind-table entry. Perhaps something similar can be done with + DWARF2 unwind info. */ + +static void +put_unwind_info (unw_addr_space_t as, unw_proc_info_t *proc_info, void *arg) +{ + /* it's a no-op */ +} + +static int +get_dyn_info_list_addr (unw_addr_space_t as, unw_word_t *dyn_info_list_addr, + void *arg) +{ + *dyn_info_list_addr = (unw_word_t) &_U_dyn_info_list; + return 0; +} + +#define PAGE_SIZE 4096 +#define PAGE_START(a) ((a) & ~(PAGE_SIZE-1)) + +/* Cache of already validated addresses */ +#define NLGA 4 +static unw_word_t last_good_addr[NLGA]; +static int lga_victim; + +static int +validate_mem (unw_word_t addr) +{ + int i, victim; +#ifdef HAVE_MINCORE + unsigned char mvec[2]; /* Unaligned access may cross page boundary */ +#endif + size_t len; + + if (PAGE_START(addr + sizeof (unw_word_t) - 1) == PAGE_START(addr)) + len = PAGE_SIZE; + else + len = PAGE_SIZE * 2; + + addr = PAGE_START(addr); + + if (addr == 0) + return -1; + + for (i = 0; i < NLGA; i++) + { + if (last_good_addr[i] && (addr == last_good_addr[i])) + return 0; + } + +#ifdef HAVE_MINCORE + if (mincore ((void *) addr, len, mvec) == -1) +#else + if (msync ((void *) addr, len, MS_ASYNC) == -1) +#endif + return -1; + + victim = lga_victim; + for (i = 0; i < NLGA; i++) { + if (!last_good_addr[victim]) { + last_good_addr[victim++] = addr; + return 0; + } + victim = (victim + 1) % NLGA; + } + + /* All slots full. Evict the victim. */ + last_good_addr[victim] = addr; + victim = (victim + 1) % NLGA; + lga_victim = victim; + + return 0; +} + +static int +access_mem (unw_addr_space_t as, unw_word_t addr, unw_word_t *val, int write, + void *arg) +{ + if (write) + { + Debug (16, "mem[%x] <- %x\n", addr, *val); + *(unw_word_t *) addr = *val; + } + else + { + /* validate address */ + const struct cursor *c = (const struct cursor *)arg; + if (c && c->validate && validate_mem(addr)) + return -1; + *val = *(unw_word_t *) addr; + Debug (16, "mem[%x] -> %x\n", addr, *val); + } + return 0; +} + +static int +access_reg (unw_addr_space_t as, unw_regnum_t reg, unw_word_t *val, int write, + void *arg) +{ + unw_word_t *addr; + ucontext_t *uc = ((struct cursor *)arg)->uc; + + if (unw_is_fpreg (reg)) + goto badreg; + + if (!(addr = x86_r_uc_addr (uc, reg))) + goto badreg; + + if (write) + { + *(unw_word_t *) addr = *val; + Debug (12, "%s <- %x\n", unw_regname (reg), *val); + } + else + { + *val = *(unw_word_t *) addr; + Debug (12, "%s -> %x\n", unw_regname (reg), *val); + } + return 0; + + badreg: + Debug (1, "bad register number %u\n", reg); + return -UNW_EBADREG; +} + +static int +access_fpreg (unw_addr_space_t as, unw_regnum_t reg, unw_fpreg_t *val, + int write, void *arg) +{ + ucontext_t *uc = ((struct cursor *)arg)->uc; + unw_fpreg_t *addr; + + if (!unw_is_fpreg (reg)) + goto badreg; + + if (!(addr = x86_r_uc_addr (uc, reg))) + goto badreg; + + if (write) + { + Debug (12, "%s <- %08lx.%08lx.%08lx\n", unw_regname (reg), + ((long *)val)[0], ((long *)val)[1], ((long *)val)[2]); + *(unw_fpreg_t *) addr = *val; + } + else + { + *val = *(unw_fpreg_t *) addr; + Debug (12, "%s -> %08lx.%08lx.%08lx\n", unw_regname (reg), + ((long *)val)[0], ((long *)val)[1], ((long *)val)[2]); + } + return 0; + + badreg: + Debug (1, "bad register number %u\n", reg); + /* attempt to access a non-preserved register */ + return -UNW_EBADREG; +} + +static int +get_static_proc_name (unw_addr_space_t as, unw_word_t ip, + char *buf, size_t buf_len, unw_word_t *offp, + void *arg) +{ + return _Uelf32_get_proc_name (as, getpid (), ip, buf, buf_len, offp); +} + +HIDDEN void +x86_local_addr_space_init (void) +{ + memset (&local_addr_space, 0, sizeof (local_addr_space)); + local_addr_space.caching_policy = UNWI_DEFAULT_CACHING_POLICY; + local_addr_space.acc.find_proc_info = dwarf_find_proc_info; + local_addr_space.acc.put_unwind_info = put_unwind_info; + local_addr_space.acc.get_dyn_info_list_addr = get_dyn_info_list_addr; + local_addr_space.acc.access_mem = access_mem; + local_addr_space.acc.access_reg = access_reg; + local_addr_space.acc.access_fpreg = access_fpreg; + local_addr_space.acc.resume = x86_local_resume; + local_addr_space.acc.get_proc_name = get_static_proc_name; + unw_flush_cache (&local_addr_space, 0, 0); +} + +#endif /* !UNW_REMOTE_ONLY */ |