option(WITH_CORE_DUMP "builds with support for core dump files (with GPL2 license)")
set(CRASH_STACK_BIN "crash-stack")
-set(CRASH_STACK_SRCS crash-stack.c)
+set(CRASH_STACK_SRCS crash-stack.c crash-stack-libelf-helpers.c)
if (${CMAKE_SYSTEM_PROCESSOR} STREQUAL "armv7l")
set(CRASH_STACK_SRCS ${CRASH_STACK_SRCS} crash-stack-arm.c wind/unwarm.c wind/unwarm_thumb.c wind/unwarm_arm.c wind/unwarmmem.c)
else()
- set(CRASH_STACK_SRCS ${CRASH_STACK_SRCS} crash-stack-libelf.c)
+ if (${CMAKE_SYSTEM_PROCESSOR} STREQUAL "aarch64")
+ set(CRASH_STACK_SRCS ${CRASH_STACK_SRCS} crash-stack-aarch64.c)
+ elseif (${CMAKE_SYSTEM_PROCESSOR} STREQUAL "x86_64")
+ set(CRASH_STACK_SRCS ${CRASH_STACK_SRCS} crash-stack-libelf.c)
+ set(CRASH_STACK_SRCS ${CRASH_STACK_SRCS} crash-stack-x86_64.c)
+ endif()
endif()
add_executable(${CRASH_STACK_BIN} ${CRASH_STACK_SRCS})
--- /dev/null
+#include "crash-stack.h"
+#include <sys/user.h>
+#include <string.h>
+
+static struct user_regs_struct g_registers;
+
+struct Regs {
+ Dwarf_Addr x29;
+ Dwarf_Addr x30;
+ Dwarf_Addr pc;
+ Dwarf_Addr sp;
+};
+
+#define REG_SP 32
+#define REG_PC 33
+#define REG_X29 29
+#define REG_X30 30
+
+typedef struct Regs Regs;
+static Regs g_regs;
+
+void *crash_stack_get_memory_for_ptrace_registers(size_t *size)
+{
+ if (NULL != size)
+ *size = sizeof(g_registers);
+ return &g_registers;
+}
+
+void crash_stack_set_ptrace_registers(void *regbuf)
+{
+ struct user_regs_struct *regs = regbuf;
+
+ memcpy(get_place_for_register_value("sp", 0), ®s->sp, sizeof(regs->sp));
+ memcpy(get_place_for_register_value("pc", 0), ®s->pc, sizeof(regs->pc));
+ memcpy(get_place_for_register_value("x29", 0), ®s->regs[29], sizeof(regs->regs[29]));
+ memcpy(get_place_for_register_value("x30", 0), ®s->regs[30], sizeof(regs->regs[30]));
+}
+
+void create_crash_stack(Dwfl *dwfl, Elf *core, pid_t pid, Mappings *mappings, Callstack *callstack)
+{
+ callstack->elems = 0;
+ callstack->tab[callstack->elems++] = g_regs.pc;
+ callstack->tab[callstack->elems++] = g_regs.x30;
+
+ bool end = false;
+
+ do {
+ uint64_t newx29, newx30;
+ bool read29 = crash_stack_libelf_read_value(dwfl, core, pid,
+ g_regs.x29,
+ &newx29, sizeof(newx29), mappings);
+ bool read30 = crash_stack_libelf_read_value(dwfl, core, pid,
+ g_regs.x29 + sizeof(newx29),
+ &newx30, sizeof(newx30), mappings);
+ if (read29 && read30) {
+ callstack->tab[callstack->elems++] = newx30;
+ g_regs.x29 = newx29;
+ }
+ else end = true;
+ } while (!end);
+}
+
+void *get_place_for_register_value(const char *regname, int regnum)
+{
+ if (strcmp(regname, "pc") == 0 || REG_PC == regnum)
+ return &g_regs.pc;
+ else if (strcmp(regname, "sp") == 0 || REG_SP == regnum)
+ return &g_regs.sp;
+ else if (strcmp(regname, "x29") == 0 || REG_X29 == regnum)
+ return &g_regs.x29;
+ else if (strcmp(regname, "x30") == 0 || REG_X30 == regnum)
+ return &g_regs.x30;
+ return NULL;
+}
#include <string.h>
#include <sys/ptrace.h>
+#include <sys/user.h>
static Elf *g_core = NULL;
static Dwfl *g_dwfl = NULL;
typedef struct Regs Regs;
static Regs g_regs;
+static struct user_regs g_ptrace_registers;
+
+void *crash_stack_get_memory_for_ptrace_registers(size_t *size)
+{
+ if (NULL != size)
+ *size = sizeof(g_ptrace_registers);
+ return &g_ptrace_registers;
+}
+
void *get_place_for_register_value(const char *regname, int regnum)
{
if (strcmp(regname, "pc") == 0 || REG_PC == regnum)
return NULL;
}
+void crash_stack_set_ptrace_registers(void *regbuf)
+{
+ struct user_regs *registers = regbuf;
+ int i;
+ for (i = 0; i < sizeof(registers->uregs)/sizeof(registers->uregs[0]); i++) {
+ void *regmem = get_place_for_register_value("", i);
+ if (NULL != regmem)
+ memcpy(regmem, ®isters->uregs[i], sizeof(registers->uregs[i]));
+ }
+}
+
static Boolean report(void *data, Int32 address)
{
Callstack *callstack = (Callstack *)(data);
Boolean readT(Int32 a, void *v, size_t size)
{
- Dwfl_Module *module = 0;
- Elf_Data *data = NULL;
-
- int segment = dwfl_addrsegment(g_dwfl, a, &module);
-
- if (module != NULL) {
- Dwarf_Addr start;
- dwfl_module_info(module, NULL, &start, NULL, NULL, NULL, NULL, NULL);
-
- GElf_Addr bias;
- Elf *elf = dwfl_module_getelf(module, &bias);
-
- data = elf_getdata_rawchunk(elf, a-start, size, ELF_T_BYTE);
- }
- if (NULL == data && segment != -1) {
- // get data from segment
- GElf_Phdr mem;
- GElf_Phdr *phdr;
- Dwarf_Addr offset_in_segment;
-
- phdr = gelf_getphdr(g_core, segment, &mem);
- if (phdr != NULL) {
- offset_in_segment = a - phdr->p_vaddr;
- if (offset_in_segment < phdr->p_filesz) {
- Dwarf_Addr offset_in_file = phdr->p_offset + offset_in_segment;
-
- data = elf_getdata_rawchunk(g_core, offset_in_file, size, ELF_T_BYTE);
- }
- }
- }
-
- if (NULL == data && module != NULL) {
- const char *name = dwfl_module_info(module, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
- if (name != NULL && name[0] == '[') {
- int i;
- // get module from mappings
- for (i = 0; i < g_mappings->elems; i++) {
- if (g_mappings->tab[i].m_start <= a && a < g_mappings->tab[i].m_end) {
- // compute offset relative to the start of the mapping
- Int32 offset = a - g_mappings->tab[i].m_start;
- // read from the file, but also account file offset
- data = elf_getdata_rawchunk(g_mappings->tab[i].m_elf,
- offset + g_mappings->tab[i].m_offset, size, ELF_T_BYTE);
- break;
- }
- }
- }
- }
-
- if (data != NULL) {
- memcpy(v, data->d_buf, size);
- return TRUE;
- }
-
- /* Still no data, but we have a process - read memory with ptrace */
- if (NULL == data && g_pid > 1) {
- long val = ptrace(PTRACE_PEEKDATA, g_pid, a, NULL);
- memcpy(v, &val, size);
- return TRUE;
- }
-
- return FALSE;
+ return crash_stack_libelf_read_value(g_dwfl, g_core, g_pid, a, v, size, g_mappings);
}
static Boolean readW(Int32 a, Int32 *v)
static Int32 getProloguePC(Int32 current_pc)
{
- Int32 result = 0;
- Dwfl_Module *module = dwfl_addrmodule(g_dwfl, current_pc);
- if (module) {
- // GElf_Off offset;
- GElf_Sym sym;
- // dwfl_module_addrinfo (module, current_pc, &offset, &sym, NULL, NULL, NULL);
- dwfl_module_addrsym(module, current_pc, &sym, NULL);
- // result = current_pc - offset;
- result = sym.st_value;
- }
- if (0 == result) {
- int i;
- for (i = 0; i < g_mappings->elems; i++) {
- if (g_mappings->tab[i].m_start <= current_pc && current_pc < g_mappings->tab[i].m_end) {
- /* go through symbols to find the nearest */
- Elf_Scn *scn = NULL;
- Elf *elf = g_mappings->tab[i].m_elf;
- while ((scn = elf_nextscn(elf, scn)) != NULL) {
- GElf_Shdr shdr_mem;
- GElf_Shdr *shdr = gelf_getshdr(scn, &shdr_mem);
- if (shdr != NULL && (shdr->sh_type == SHT_SYMTAB || shdr->sh_type == SHT_DYNSYM)) {
- Elf_Data *sdata = elf_getdata(scn, NULL);
- unsigned int nsyms = sdata->d_size / (gelf_getclass(elf) == ELFCLASS32 ?
- sizeof(Elf32_Sym) :
- sizeof(Elf64_Sym));
- unsigned int cnt;
- uintptr_t address_offset = current_pc;
- if (shdr->sh_type == SHT_DYNSYM)
- address_offset -= g_mappings->tab[i].m_start;
- for (cnt = 0; cnt < nsyms; ++cnt) {
- GElf_Sym sym_mem;
- Elf32_Word xndx;
- GElf_Sym *sym = gelf_getsymshndx(sdata, NULL, cnt, &sym_mem, &xndx);
- if (sym != NULL && sym->st_shndx != SHN_UNDEF) {
- if (sym->st_value <= address_offset && address_offset < sym->st_value + sym->st_size)
- return sym->st_value;
- }
- }
- }
- }
- }
- }
- }
- return result;
+ return crash_stack_libelf_get_prologue_pc(g_dwfl, current_pc, g_mappings);
}
void create_crash_stack(Dwfl *dwfl, Elf *core, pid_t pid, Mappings *mappings, Callstack *callstack)
--- /dev/null
+#include "crash-stack.h"
+#include <string.h>
+#include <sys/ptrace.h>
+#include <errno.h>
+
+bool crash_stack_libelf_read_value(Dwfl *dwfl, Elf *core, pid_t pid,
+ Dwarf_Addr a, void *v, size_t size,
+ Mappings *mappings)
+{
+ Dwfl_Module *module = 0;
+ Elf_Data *data = NULL;
+
+ int segment = dwfl_addrsegment(dwfl, a, &module);
+
+ if (module != NULL) {
+ Dwarf_Addr start;
+ dwfl_module_info(module, NULL, &start, NULL, NULL, NULL, NULL, NULL);
+
+ GElf_Addr bias;
+ Elf *elf = dwfl_module_getelf(module, &bias);
+
+ data = elf_getdata_rawchunk(elf, a-start, size, ELF_T_BYTE);
+ }
+ if (NULL == data && segment != -1) {
+ // get data from segment
+ GElf_Phdr mem;
+ GElf_Phdr *phdr = gelf_getphdr(core, segment, &mem);
+ Dwarf_Addr offset_in_segment = a - phdr->p_vaddr;
+ if (offset_in_segment < phdr->p_filesz) {
+ Dwarf_Addr offset_in_file = phdr->p_offset + offset_in_segment;
+
+ data = elf_getdata_rawchunk(core, offset_in_file, size, ELF_T_BYTE);
+ }
+ }
+
+ if (NULL == data && module != NULL) {
+ const char *name = dwfl_module_info(module, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
+ if (name != NULL && name[0] == '[') {
+ int i;
+ // get module from mappings
+ for (i = 0; i < mappings->elems; i++) {
+ if (mappings->tab[i].m_start <= a && a < mappings->tab[i].m_end) {
+ // compute offset relative to the start of the mapping
+ long offset = a - mappings->tab[i].m_start;
+ // read from the file, but also account file offset
+ data = elf_getdata_rawchunk(mappings->tab[i].m_elf,
+ offset + mappings->tab[i].m_offset, size, ELF_T_BYTE);
+ break;
+ }
+ }
+ }
+ }
+
+ if (data != NULL) {
+ memcpy(v, data->d_buf, size);
+ return true;
+ }
+
+ /* Still no data, but we have a process - read memory with ptrace */
+ /* FIXME need to know if we are still in the mapped area */
+ /* Bigger issue is that dwfl does not have modules */
+ if (pid > 1) {
+ long val = ptrace(PTRACE_PEEKDATA, pid, a, NULL);
+ if (-1 == val && errno)
+ return false;
+ memcpy(v, &val, size);
+ return true;
+ }
+
+ return false;
+}
+
+Dwarf_Addr crash_stack_libelf_get_prologue_pc(Dwfl *dwfl, Dwarf_Addr current_pc, Mappings *mappings)
+{
+ Dwarf_Addr result = 0;
+ Dwfl_Module *module = dwfl_addrmodule(dwfl, current_pc);
+ if (module) {
+ GElf_Sym sym;
+ dwfl_module_addrsym(module, current_pc, &sym, NULL);
+ result = sym.st_value;
+ }
+ if (0 == result) {
+ int i;
+ for (i=0; i < mappings->elems; i++) {
+ if (mappings->tab[i].m_start <= current_pc && current_pc < mappings->tab[i].m_end) {
+ /* go through symbols to find the nearest */
+ Elf_Scn *scn = NULL;
+ Elf *elf = mappings->tab[i].m_elf;
+ while ((scn = elf_nextscn(elf, scn)) != NULL) {
+ GElf_Shdr shdr_mem;
+ GElf_Shdr *shdr = gelf_getshdr(scn, &shdr_mem);
+ if (shdr != NULL && (shdr->sh_type == SHT_SYMTAB || shdr->sh_type == SHT_DYNSYM)) {
+ Elf_Data *sdata = elf_getdata(scn, NULL);
+ unsigned int nsyms = sdata->d_size / (gelf_getclass(elf) == ELFCLASS32 ?
+ sizeof(Elf32_Sym) :
+ sizeof(Elf64_Sym));
+ unsigned int cnt;
+ uintptr_t address_offset = current_pc;
+ if (shdr->sh_type == SHT_DYNSYM)
+ address_offset -= mappings->tab[i].m_start;
+ for (cnt = 0; cnt < nsyms; ++cnt) {
+ GElf_Sym sym_mem;
+ Elf32_Word xndx;
+ GElf_Sym *sym = gelf_getsymshndx(sdata, NULL, cnt, &sym_mem, &xndx);
+ if (sym != NULL && sym->st_shndx != SHN_UNDEF) {
+ if (sym->st_value <= address_offset && address_offset < sym->st_value + sym->st_size) {
+ return sym->st_value;
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+ return result;
+}
#include "crash-stack.h"
#include <elfutils/libdwfl.h>
#include <elfutils/version.h>
+#include <string.h>
+
+typedef union {
+ uint16_t reg16;
+ uint32_t reg32;
+ uint64_t reg64;
+} Register;
+
+static Register g_pc;
+static Register g_sp;
#if _ELFUTILS_PREREQ(0, 158)
static int frame_callback(Dwfl_Frame *state, void *arg)
}
#endif
+static const char *pc_names[] = {
+ "pc", "rip", "eip", "ip"
+};
+
+static const char *sp_names[] = {
+ "sp", "rsp", "esp"
+};
+
+static bool is_in(const char *name, const char **names, int elems)
+{
+ int nit;
+ for (nit = 0; nit < elems; ++nit) {
+ if (strcmp(name, names[nit]) == 0)
+ return true;
+ }
+ return false;
+}
+
+#define IS_IN(name,names) is_in((name), (names), sizeof(names)/sizeof(names[0]))
+
void *get_place_for_register_value(const char *regname, int regnum)
{
- return 0;
+ if (IS_IN(regname, pc_names)) return &g_pc;
+ else if (IS_IN(regname, sp_names)) return &g_sp;
+
+ return 0;
}
void create_crash_stack(Dwfl *dwfl, Elf *core, pid_t pid, Mappings *mappings, Callstack *callstack)
--- /dev/null
+#include "crash-stack.h"
+#include <sys/user.h>
+#include <string.h>
+
+struct user_regs_struct g_registers;
+
+void *crash_stack_get_memory_for_ptrace_registers(size_t *size)
+{
+ if (NULL != size)
+ *size = sizeof(g_registers);
+ return &g_registers;
+}
+
+void crash_stack_set_ptrace_registers(void *regbuf)
+{
+ void *rsp = get_place_for_register_value("rsp", 0);
+ void *rip = get_place_for_register_value("rip", 0);
+
+ struct user_regs_struct *regs = regbuf;
+
+ memcpy(rsp, ®s->rsp, sizeof(regs->rsp));
+ memcpy(rip, ®s->rip, sizeof(regs->rip));
+}
static void getvalue(Elf *core, const void *from, size_t size, void *to)
{
+ Elf_Type type = ELF_T_BYTE;
+ switch (size) {
+ case 8: type = ELF_T_BYTE; break;
+ case 16: type = ELF_T_HALF; break;
+ case 32: type = ELF_T_WORD; break;
+ case 64: type = ELF_T_XWORD; break;
+ default:
+ fprintf(stderr, "getvalue for strange size: %llu\n", (unsigned long long)size);
+ break;
+ }
Elf_Data out = {
.d_buf = to,
- .d_type = size == 32 ? ELF_T_WORD : ELF_T_XWORD,
+ .d_type = type,
.d_version = EV_CURRENT,
.d_size = size/8,
.d_off = 0,
static int get_registers_ptrace(pid_t pid)
{
struct iovec data;
- uintptr_t regbuf[20];
-
- data.iov_base = regbuf;
- data.iov_len = sizeof(regbuf);
+ data.iov_base = crash_stack_get_memory_for_ptrace_registers( &data.iov_len );
if (ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &data) != 0) {
fprintf(errfile, "PTRACE_GETREGSET failed on PID %d: %m\n", pid);
return -1;
}
- size_t i;
- for (i = 0;
- i * sizeof(regbuf[0]) < data.iov_len && i < sizeof(regbuf)/sizeof(regbuf[0]);
- i++) {
- void *reg = get_place_for_register_value("", i);
+ crash_stack_set_ptrace_registers(data.iov_base);
- if (NULL != reg)
- memcpy(reg, ®buf[i], sizeof(regbuf[i]));
- }
return 0;
}
void *get_place_for_register_value(const char *regname, int regnum);
void create_crash_stack(Dwfl *dwfl, Elf *core, pid_t pid, Mappings *mappings, Callstack *callstack);
+Dwarf_Addr crash_stack_libelf_get_prologue_pc(Dwfl *dwfl, Dwarf_Addr current_pc, Mappings *mappings);
+bool crash_stack_libelf_read_value(Dwfl *dwfl, Elf *core, pid_t pid,
+ Dwarf_Addr a, void *v, size_t size,
+ Mappings *mappings);
+
+void *crash_stack_get_memory_for_ptrace_registers(size_t *size);
+void crash_stack_set_ptrace_registers(void *regbuf);
+
#endif /* CRASH_STACK_H */
projects / platform / core / system / crash-worker.git / commitdiff