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提交 ca4a62ec 编写于 作者: D dsamersoff
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上级 3f781ccb 6a27cf69
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Showing with 510 addition and 448 deletion
agent/src/os/bsd/ps_core.c
浏览文件 @ ca4a62ec
......@@ -44,6 +44,7 @@
// close all file descriptors
static void close_files(struct ps_prochandle* ph) {
lib_info* lib = NULL;
// close core file descriptor
if (ph->core->core_fd >= 0)
close(ph->core->core_fd);
......@@ -149,8 +150,7 @@ static map_info* add_class_share_map_info(struct ps_prochandle* ph, off_t offset
// Return the map_info for the given virtual address. We keep a sorted
// array of pointers in ph->map_array, so we can binary search.
static map_info* core_lookup(struct ps_prochandle *ph, uintptr_t addr)
{
static map_info* core_lookup(struct ps_prochandle *ph, uintptr_t addr) {
int mid, lo = 0, hi = ph->core->num_maps - 1;
map_info *mp;
......@@ -230,9 +230,9 @@ struct FileMapHeader {
size_t _used; // for setting space top on read
// 4991491 NOTICE These are C++ bool's in filemap.hpp and must match up with
// the C type matching the C++ bool type on any given platform. For
// Hotspot on BSD we assume the corresponding C type is char but
// licensees on BSD versions may need to adjust the type of these fields.
// the C type matching the C++ bool type on any given platform.
// We assume the corresponding C type is char but licensees
// may need to adjust the type of these fields.
char _read_only; // read only space?
char _allow_exec; // executable code in space?
......@@ -286,10 +286,12 @@ static bool read_string(struct ps_prochandle* ph, uintptr_t addr, char* buf, siz
#define USE_SHARED_SPACES_SYM "_UseSharedSpaces"
// mangled name of Arguments::SharedArchivePath
#define SHARED_ARCHIVE_PATH_SYM "_ZN9Arguments17SharedArchivePathE"
#define LIBJVM_NAME "/libjvm.dylib"
#else
#define USE_SHARED_SPACES_SYM "UseSharedSpaces"
// mangled name of Arguments::SharedArchivePath
#define SHARED_ARCHIVE_PATH_SYM "__ZN9Arguments17SharedArchivePathE"
#define LIBJVM_NAME "/libjvm.so"
#endif // __APPLE_
static bool init_classsharing_workaround(struct ps_prochandle* ph) {
......@@ -300,12 +302,7 @@ static bool init_classsharing_workaround(struct ps_prochandle* ph) {
// we are iterating over shared objects from the core dump. look for
// libjvm.so.
const char *jvm_name = 0;
#ifdef __APPLE__
if ((jvm_name = strstr(lib->name, "/libjvm.dylib")) != 0)
#else
if ((jvm_name = strstr(lib->name, "/libjvm.so")) != 0)
#endif // __APPLE__
{
if ((jvm_name = strstr(lib->name, LIBJVM_NAME)) != 0) {
char classes_jsa[PATH_MAX];
struct FileMapHeader header;
int fd = -1;
......@@ -1121,7 +1118,7 @@ static bool read_core_segments(struct ps_prochandle* ph, ELF_EHDR* core_ehdr) {
* contains a set of saved /proc structures), and PT_LOAD (which
* represents a memory mapping from the process's address space).
*
* Difference b/w Solaris PT_NOTE and BSD PT_NOTE:
* Difference b/w Solaris PT_NOTE and Linux/BSD PT_NOTE:
*
* In Solaris there are two PT_NOTE segments the first PT_NOTE (if present)
* contains /proc structs in the pre-2.6 unstructured /proc format. the last
......@@ -1171,17 +1168,46 @@ static bool read_lib_segments(struct ps_prochandle* ph, int lib_fd, ELF_EHDR* li
ELF_PHDR* phbuf;
ELF_PHDR* lib_php = NULL;
if ((phbuf = read_program_header_table(lib_fd, lib_ehdr)) == NULL)
int page_size=sysconf(_SC_PAGE_SIZE);
if ((phbuf = read_program_header_table(lib_fd, lib_ehdr)) == NULL) {
return false;
}
// we want to process only PT_LOAD segments that are not writable.
// i.e., text segments. The read/write/exec (data) segments would
// have been already added from core file segments.
for (lib_php = phbuf, i = 0; i < lib_ehdr->e_phnum; i++) {
if ((lib_php->p_type == PT_LOAD) && !(lib_php->p_flags & PF_W) && (lib_php->p_filesz != 0)) {
if (add_map_info(ph, lib_fd, lib_php->p_offset, lib_php->p_vaddr + lib_base, lib_php->p_filesz) == NULL)
uintptr_t target_vaddr = lib_php->p_vaddr + lib_base;
map_info *existing_map = core_lookup(ph, target_vaddr);
if (existing_map == NULL){
if (add_map_info(ph, lib_fd, lib_php->p_offset,
target_vaddr, lib_php->p_filesz) == NULL) {
goto err;
}
} else {
if ((existing_map->memsz != page_size) &&
(existing_map->fd != lib_fd) &&
(existing_map->memsz != lib_php->p_filesz)){
print_debug("address conflict @ 0x%lx (size = %ld, flags = %d\n)",
target_vaddr, lib_php->p_filesz, lib_php->p_flags);
goto err;
}
/* replace PT_LOAD segment with library segment */
print_debug("overwrote with new address mapping (memsz %ld -> %ld)\n",
existing_map->memsz, lib_php->p_filesz);
existing_map->fd = lib_fd;
existing_map->offset = lib_php->p_offset;
existing_map->memsz = lib_php->p_filesz;
}
}
lib_php++;
}
......@@ -1192,7 +1218,7 @@ err:
return false;
}
// process segments from interpreter (ld-elf.so.1)
// process segments from interpreter (ld.so or ld-linux.so or ld-elf.so)
static bool read_interp_segments(struct ps_prochandle* ph) {
ELF_EHDR interp_ehdr;
......@@ -1309,26 +1335,28 @@ static bool read_shared_lib_info(struct ps_prochandle* ph) {
}
// read ld_base address from struct r_debug
// XXX: There is no r_ldbase member on BSD
/*
#if 0 // There is no r_ldbase member on BSD
if (ps_pread(ph, (psaddr_t) debug_base + LD_BASE_OFFSET, &ld_base_addr,
sizeof(uintptr_t)) != PS_OK) {
print_debug("can't read ld base address\n");
return false;
}
ph->core->ld_base_addr = ld_base_addr;
*/
#else
ph->core->ld_base_addr = 0;
#endif
print_debug("interpreter base address is 0x%lx\n", ld_base_addr);
// now read segments from interp (i.e ld-elf.so.1)
if (read_interp_segments(ph) != true)
// now read segments from interp (i.e ld.so or ld-linux.so or ld-elf.so)
if (read_interp_segments(ph) != true) {
return false;
}
// after adding interpreter (ld.so) mappings sort again
if (sort_map_array(ph) != true)
if (sort_map_array(ph) != true) {
return false;
}
print_debug("first link map is at 0x%lx\n", first_link_map_addr);
......@@ -1380,8 +1408,9 @@ static bool read_shared_lib_info(struct ps_prochandle* ph) {
add_lib_info_fd(ph, lib_name, lib_fd, lib_base);
// Map info is added for the library (lib_name) so
// we need to re-sort it before calling the p_pdread.
if (sort_map_array(ph) != true)
if (sort_map_array(ph) != true) {
return false;
}
} else {
print_debug("can't read ELF header for shared object %s\n", lib_name);
close(lib_fd);
......@@ -1408,7 +1437,7 @@ struct ps_prochandle* Pgrab_core(const char* exec_file, const char* core_file) {
struct ps_prochandle* ph = (struct ps_prochandle*) calloc(1, sizeof(struct ps_prochandle));
if (ph == NULL) {
print_debug("cant allocate ps_prochandle\n");
print_debug("can't allocate ps_prochandle\n");
return NULL;
}
......@@ -1449,33 +1478,40 @@ struct ps_prochandle* Pgrab_core(const char* exec_file, const char* core_file) {
}
// process core file segments
if (read_core_segments(ph, &core_ehdr) != true)
if (read_core_segments(ph, &core_ehdr) != true) {
goto err;
}
// process exec file segments
if (read_exec_segments(ph, &exec_ehdr) != true)
if (read_exec_segments(ph, &exec_ehdr) != true) {
goto err;
}
// exec file is also treated like a shared object for symbol search
if (add_lib_info_fd(ph, exec_file, ph->core->exec_fd,
(uintptr_t)0 + find_base_address(ph->core->exec_fd, &exec_ehdr)) == NULL)
(uintptr_t)0 + find_base_address(ph->core->exec_fd, &exec_ehdr)) == NULL) {
goto err;
}
// allocate and sort maps into map_array, we need to do this
// here because read_shared_lib_info needs to read from debuggee
// address space
if (sort_map_array(ph) != true)
if (sort_map_array(ph) != true) {
goto err;
}
if (read_shared_lib_info(ph) != true)
if (read_shared_lib_info(ph) != true) {
goto err;
}
// sort again because we have added more mappings from shared objects
if (sort_map_array(ph) != true)
if (sort_map_array(ph) != true) {
goto err;
}
if (init_classsharing_workaround(ph) != true)
if (init_classsharing_workaround(ph) != true) {
goto err;
}
print_debug("Leave Pgrab_core\n");
return ph;
......
agent/src/os/linux/ps_core.c
浏览文件 @ ca4a62ec
......@@ -41,7 +41,7 @@
// ps_prochandle cleanup helper functions
// close all file descriptors
static void close_elf_files(struct ps_prochandle* ph) {
static void close_files(struct ps_prochandle* ph) {
lib_info* lib = NULL;
// close core file descriptor
......@@ -64,7 +64,9 @@ static void close_elf_files(struct ps_prochandle* ph) {
lib = ph->libs;
while (lib) {
int fd = lib->fd;
if (fd >= 0 && fd != ph->core->exec_fd) close(fd);
if (fd >= 0 && fd != ph->core->exec_fd) {
close(fd);
}
lib = lib->next;
}
}
......@@ -94,7 +96,7 @@ static void destroy_map_info(struct ps_prochandle* ph) {
// ps_prochandle operations
static void core_release(struct ps_prochandle* ph) {
if (ph->core) {
close_elf_files(ph);
close_files(ph);
destroy_map_info(ph);
free(ph->core);
}
......@@ -132,40 +134,43 @@ static map_info* add_map_info(struct ps_prochandle* ph, int fd, off_t offset,
}
// Part of the class sharing workaround
static void add_class_share_map_info(struct ps_prochandle* ph, off_t offset,
static map_info* add_class_share_map_info(struct ps_prochandle* ph, off_t offset,
uintptr_t vaddr, size_t memsz) {
map_info* map;
if ((map = allocate_init_map(ph->core->classes_jsa_fd,
offset, vaddr, memsz)) == NULL) {
return;
return NULL;
}
map->next = ph->core->class_share_maps;
ph->core->class_share_maps = map;
return map;
}
// Return the map_info for the given virtual address. We keep a sorted
// array of pointers in ph->map_array, so we can binary search.
static map_info* core_lookup(struct ps_prochandle *ph, uintptr_t addr)
{
static map_info* core_lookup(struct ps_prochandle *ph, uintptr_t addr) {
int mid, lo = 0, hi = ph->core->num_maps - 1;
map_info *mp;
while (hi - lo > 1) {
mid = (lo + hi) / 2;
if (addr >= ph->core->map_array[mid]->vaddr)
if (addr >= ph->core->map_array[mid]->vaddr) {
lo = mid;
else
} else {
hi = mid;
}
}
if (addr < ph->core->map_array[hi]->vaddr)
if (addr < ph->core->map_array[hi]->vaddr) {
mp = ph->core->map_array[lo];
else
} else {
mp = ph->core->map_array[hi];
}
if (addr >= mp->vaddr && addr < mp->vaddr + mp->memsz)
if (addr >= mp->vaddr && addr < mp->vaddr + mp->memsz) {
return (mp);
}
// Part of the class sharing workaround
......@@ -176,13 +181,11 @@ static map_info* core_lookup(struct ps_prochandle *ph, uintptr_t addr)
// want to prefer class sharing data to data from core.
mp = ph->core->class_share_maps;
if (mp) {
print_debug("can't locate map_info at 0x%lx, trying class share maps\n",
addr);
print_debug("can't locate map_info at 0x%lx, trying class share maps\n", addr);
}
while (mp) {
if (addr >= mp->vaddr && addr < mp->vaddr + mp->memsz) {
print_debug("located map_info at 0x%lx from class share maps\n",
addr);
print_debug("located map_info at 0x%lx from class share maps\n", addr);
return (mp);
}
mp = mp->next;
......@@ -226,9 +229,9 @@ struct FileMapHeader {
size_t _used; // for setting space top on read
// 4991491 NOTICE These are C++ bool's in filemap.hpp and must match up with
// the C type matching the C++ bool type on any given platform. For
// Hotspot on Linux we assume the corresponding C type is char but
// licensees on Linux versions may need to adjust the type of these fields.
// the C type matching the C++ bool type on any given platform.
// We assume the corresponding C type is char but licensees
// may need to adjust the type of these fields.
char _read_only; // read only space?
char _allow_exec; // executable code in space?
......@@ -249,7 +252,7 @@ static bool read_jboolean(struct ps_prochandle* ph, uintptr_t addr, jboolean* pv
static bool read_pointer(struct ps_prochandle* ph, uintptr_t addr, uintptr_t* pvalue) {
uintptr_t uip;
if (ps_pdread(ph, (psaddr_t) addr, &uip, sizeof(uip)) == PS_OK) {
if (ps_pdread(ph, (psaddr_t) addr, (char *)&uip, sizeof(uip)) == PS_OK) {
*pvalue = uip;
return true;
} else {
......@@ -263,12 +266,15 @@ static bool read_string(struct ps_prochandle* ph, uintptr_t addr, char* buf, siz
char c = ' ';
while (c != '\0') {
if (ps_pdread(ph, (psaddr_t) addr, &c, sizeof(char)) != PS_OK)
if (ps_pdread(ph, (psaddr_t) addr, &c, sizeof(char)) != PS_OK) {
return false;
if (i < size - 1)
}
if (i < size - 1) {
buf[i] = c;
else // smaller buffer
} else {
// smaller buffer
return false;
}
i++; addr++;
}
......@@ -279,6 +285,7 @@ static bool read_string(struct ps_prochandle* ph, uintptr_t addr, char* buf, siz
#define USE_SHARED_SPACES_SYM "UseSharedSpaces"
// mangled name of Arguments::SharedArchivePath
#define SHARED_ARCHIVE_PATH_SYM "_ZN9Arguments17SharedArchivePathE"
#define LIBJVM_NAME "/libjvm.so"
static bool init_classsharing_workaround(struct ps_prochandle* ph) {
lib_info* lib = ph->libs;
......@@ -286,11 +293,12 @@ static bool init_classsharing_workaround(struct ps_prochandle* ph) {
// we are iterating over shared objects from the core dump. look for
// libjvm.so.
const char *jvm_name = 0;
if ((jvm_name = strstr(lib->name, "/libjvm.so")) != 0) {
if ((jvm_name = strstr(lib->name, LIBJVM_NAME)) != 0) {
char classes_jsa[PATH_MAX];
struct FileMapHeader header;
int fd = -1;
int m = 0;
size_t n = 0;
int fd = -1, m = 0;
uintptr_t base = 0, useSharedSpacesAddr = 0;
uintptr_t sharedArchivePathAddrAddr = 0, sharedArchivePathAddr = 0;
jboolean useSharedSpaces = 0;
......@@ -399,8 +407,9 @@ static int core_cmp_mapping(const void *lhsp, const void *rhsp)
const map_info *lhs = *((const map_info **)lhsp);
const map_info *rhs = *((const map_info **)rhsp);
if (lhs->vaddr == rhs->vaddr)
if (lhs->vaddr == rhs->vaddr) {
return (0);
}
return (lhs->vaddr < rhs->vaddr ? -1 : 1);
}
......@@ -427,7 +436,10 @@ static bool sort_map_array(struct ps_prochandle* ph) {
}
// sort is called twice. If this is second time, clear map array
if (ph->core->map_array) free(ph->core->map_array);
if (ph->core->map_array) {
free(ph->core->map_array);
}
ph->core->map_array = array;
// sort the map_info array by base virtual address.
qsort(ph->core->map_array, ph->core->num_maps, sizeof (map_info*),
......@@ -460,16 +472,18 @@ static bool core_read_data(struct ps_prochandle* ph, uintptr_t addr, char *buf,
off_t off;
int fd;
if (mp == NULL)
if (mp == NULL) {
break; /* No mapping for this address */
}
fd = mp->fd;
mapoff = addr - mp->vaddr;
len = MIN(resid, mp->memsz - mapoff);
off = mp->offset + mapoff;
if ((len = pread(fd, buf, len, off)) <= 0)
if ((len = pread(fd, buf, len, off)) <= 0) {
break;
}
resid -= len;
addr += len;
......@@ -625,9 +639,10 @@ static bool core_handle_note(struct ps_prochandle* ph, ELF_PHDR* note_phdr) {
notep->n_type, notep->n_descsz);
if (notep->n_type == NT_PRSTATUS) {
if (core_handle_prstatus(ph, descdata, notep->n_descsz) != true)
if (core_handle_prstatus(ph, descdata, notep->n_descsz) != true) {
return false;
}
}
p = descdata + ROUNDUP(notep->n_descsz, 4);
}
......@@ -654,7 +669,7 @@ static bool read_core_segments(struct ps_prochandle* ph, ELF_EHDR* core_ehdr) {
* contains a set of saved /proc structures), and PT_LOAD (which
* represents a memory mapping from the process's address space).
*
* Difference b/w Solaris PT_NOTE and Linux PT_NOTE:
* Difference b/w Solaris PT_NOTE and Linux/BSD PT_NOTE:
*
* In Solaris there are two PT_NOTE segments the first PT_NOTE (if present)
* contains /proc structs in the pre-2.6 unstructured /proc format. the last
......@@ -674,7 +689,9 @@ static bool read_core_segments(struct ps_prochandle* ph, ELF_EHDR* core_ehdr) {
for (core_php = phbuf, i = 0; i < core_ehdr->e_phnum; i++) {
switch (core_php->p_type) {
case PT_NOTE:
if (core_handle_note(ph, core_php) != true) goto err;
if (core_handle_note(ph, core_php) != true) {
goto err;
}
break;
case PT_LOAD: {
......@@ -879,13 +896,15 @@ static bool read_shared_lib_info(struct ps_prochandle* ph) {
print_debug("interpreter base address is 0x%lx\n", ld_base_addr);
// now read segments from interp (i.e ld.so or ld-linux.so)
if (read_interp_segments(ph) != true)
// now read segments from interp (i.e ld.so or ld-linux.so or ld-elf.so)
if (read_interp_segments(ph) != true) {
return false;
}
// after adding interpreter (ld.so) mappings sort again
if (sort_map_array(ph) != true)
if (sort_map_array(ph) != true) {
return false;
}
print_debug("first link map is at 0x%lx\n", first_link_map_addr);
......@@ -1008,33 +1027,40 @@ struct ps_prochandle* Pgrab_core(const char* exec_file, const char* core_file) {
}
// process core file segments
if (read_core_segments(ph, &core_ehdr) != true)
if (read_core_segments(ph, &core_ehdr) != true) {
goto err;
}
// process exec file segments
if (read_exec_segments(ph, &exec_ehdr) != true)
if (read_exec_segments(ph, &exec_ehdr) != true) {
goto err;
}
// exec file is also treated like a shared object for symbol search
if (add_lib_info_fd(ph, exec_file, ph->core->exec_fd,
(uintptr_t)0 + find_base_address(ph->core->exec_fd, &exec_ehdr)) == NULL)
(uintptr_t)0 + find_base_address(ph->core->exec_fd, &exec_ehdr)) == NULL) {
goto err;
}
// allocate and sort maps into map_array, we need to do this
// here because read_shared_lib_info needs to read from debuggee
// address space
if (sort_map_array(ph) != true)
if (sort_map_array(ph) != true) {
goto err;
}
if (read_shared_lib_info(ph) != true)
if (read_shared_lib_info(ph) != true) {
goto err;
}
// sort again because we have added more mappings from shared objects
if (sort_map_array(ph) != true)
if (sort_map_array(ph) != true) {
goto err;
}
if (init_classsharing_workaround(ph) != true)
if (init_classsharing_workaround(ph) != true) {
goto err;
}
return ph;
......
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