標(biāo)題: Bus Error [打印本頁(yè)] 作者: 51黑tt 時(shí)間: 2016-3-5 18:10 標(biāo)題: Bus Error 在x86+Linux上寫的程序，在PC機(jī)上運(yùn)行得很好。可是使用ARM的gcc進(jìn)行交叉編譯，再送到DaVinci目標(biāo)板上運(yùn)行的時(shí)候，出現(xiàn)了Bus error。
出現(xiàn)的位置如下（其中Debug的內(nèi)容是我在程序中添加的調(diào)試信息）： root@211.69.193.189:~# arm_v5t_le-gcc -g shit.c root@211.69.193.189:~# ./a.out
Debug: malloc space for the actual data: temp_buf = 0x13118
Debug: in my_recvn()
Debug: nleft = 52
Bus error
打開調(diào)試器進(jìn)行調(diào)試： root@211.69.193.189:~# gdb a.out
GNU gdb 6.3 (MontaVista 6.3-20.0.22.0501131 2005-07-22)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "armv5tl-montavista-linuxeabi"...Using host libthread_db library "/lib/tls/libthread_db.so.1".
(gdb) run // 運(yùn)行程序
Starting program: /home/zpf/a.out
Debug: in get_program_info()
Debug: in conn_server(char *err_buf_ptr)
Debug: gonna create a socket
Debug: gonna fill in the serv_addr structure
Debug: gonna connect to a server
Debug: gonna send LIN_RST
Debug: in my_sendn()
Debug: send 4 bytes to server:
Debug: gonna receive LIN_RSP
Debug: in my_recvn()
Debug: nleft = 3
Debug: received first 3 bytes from server: 7
Debug: gonna check if 3rd byte is the package type
Debug: received package length = 55
Debug: malloc space for the actual data: temp_buf = 0x13118
Debug: in my_recvn()
Debug: nleft = 52
Program received signal SIGBUS, Bus error. // 在這里出現(xiàn)了錯(cuò)誤
0x00009624 in alloc_prog_mem (detail_buf=0x13118 "\001\002",
err_buf_ptr=0xbefffc40 "") at shit.c:631
631 g_data_ptr->progtype_num = *(short *)ptr ;
(gdb) print ptr // 查看一下ptr的值
$1 = 0x13119 "\002" // 地址起始是奇數(shù)！！！
(gdb) set ptr=0x1311a // 想改一下
(gdb) continue
Continuing.
Program terminated with signal SIGBUS, Bus error.
The program no longer exists. // 可惜程序已經(jīng)退出
(gdb) quit
其中，g_data_ptr->progtype_num是一個(gè)short類型的值。
把強(qiáng)制類型轉(zhuǎn)換改為用memcpy()寫值之后，再調(diào)試 root@211.69.193.189:~# gdb test
GNU gdb 6.3 (MontaVista 6.3-20.0.22.0501131 2005-07-22)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "armv5tl-montavista-linuxeabi"...Using host libthread_db library "/lib/tls/libthread_db.so.1".
(gdb) break 626 // 把剛剛的那句強(qiáng)制類型轉(zhuǎn)換變成內(nèi)存拷貝
Breakpoint 1 at 0x9630: file test.c, line 626.
(gdb) run
Starting program: /home/zpf/test
Debug: in get_program_info()
Debug: in conn_server(char *err_buf_ptr)
Debug: gonna create a socket
Debug: gonna fill in the serv_addr structure
Debug: gonna connect to a server
Debug: gonna send LIN_RST
Debug: in my_sendn()
Debug: send 4 bytes to server:
Debug: gonna receive LIN_RSP
Debug: in my_recvn()
Debug: nleft = 3
Debug: received first 3 bytes from server: 7
Debug: gonna check if 3rd byte is the package type
Debug: received package length = 55
Debug: malloc space for the actual data: temp_buf = 0x13118
Debug: in my_recvn()
Debug: nleft = 52
Breakpoint 1, alloc_prog_mem (detail_buf=0x13118 "\001\002",
err_buf_ptr=0xbefffc40 "") at test.c:626
warning: Source file is more recent than executable.
626 memcpy(&(g_data_ptr->prog_num), ptr, 2) ; // 在這一句中斷
(gdb) print ptr // 再看看ptr
$1 = 0x1311b "\003" // 還是奇數(shù)地址
(gdb) continue // 繼續(xù)執(zhí)行
Continuing.
Debug: sum_progtype = 2 , sum_prog = 3
Debug: gonna malloc space for progtype_ptr
Debug: gonna malloc space for prog_ptr
Debug: in mv_pkg2prog_list()
Debug: gonna set ProgramType program_type_name
Debug: ProgramType program_type_name set OK
Debug: in $ == *ptr, j = 0
Debug: g_data_ptr->progtype_ptr[j].prog_ptr = temp_prog_ptr
Debug: in @ == *ptr, ptr = 0x13126
Debug: temp_prog_ptr->format = *ptr
Debug: temp_prog_ptr->program_id = *(int *)ptr
Debug: gonna set Program program_name
Debug: Program program_name set OK
Debug: finished one loop of while
Debug: in @ == *ptr, ptr = 0x1312f
Debug: temp_prog_ptr->format = *ptr
Debug: temp_prog_ptr->program_id = *(int *)ptr
Debug: gonna set Program program_name
Debug: Program program_name set OK
Debug: finished one loop of while
Debug: gonna set ProgramType program_type_name
Debug: ProgramType program_type_name set OK
Debug: in $ == *ptr, j = 1
Debug: g_data_ptr->progtype_ptr[j].prog_ptr = temp_prog_ptr
Debug: in @ == *ptr, ptr = 0x13142
Debug: temp_prog_ptr->format = *ptr
Debug: temp_prog_ptr->program_id = *(int *)ptr
Debug: gonna set Program program_name
Debug: Program program_name set OK
Debug: finished one loop of while
program type[0]
program_type_id = 1
program_type_name = love
program_num = 2
prog_ptr = 0x131d8
program[0]
program_id = 1001
program_name = you
format = 1
program[1]
program_id = 1002
program_name = me
format = 2
program type[1]
program_type_id = 2
program_type_name = hatred
program_num = 1
prog_ptr = 0x13248
program[0]
program_id = 2005
program_name = kill
format = 5
Debug: gonna return an OK
Debug: Entering send_exit_requstion()
Debug: in conn_server(char *err_buf_ptr)
Debug: gonna create a socket
Debug: gonna fill in the serv_addr structure
Debug: gonna connect to a server
Debug: gonna send EXIT_RST
Debug: in my_sendn()
Debug: send 4 bytes to server:
Debug: in my_recvn()
Debug: nleft = 4
Debug: gonna return an OK
int main()
{
struct {
char struc_char ;
int struc_int ;
short struc_short ;
long struct_long ;
} struc_val ;
char c_char ;
int i_int ;
short s_short ;
long l_long ;