gdb调试高级用法
gcc -dumpspecs
gdb 调试打印完整字符串
如何在调试内核时，同时可以调试应用程序的做法：
(cskygdb) c
Continuing.
^C
Program received signal SIGINT, Interrupt.
default_idle () at arch/csky/kernel/process.c:83
83 __asm__ __volatile__(
(cskygdb) hb *0x00065e34 ==》对应应用反汇编处的地址
Hardware assisted breakpoint 1 at 0x65e34
(cskygdb) c
Continuing. Program received signal SIGTRAP, Trace/breakpoint trap.
0x00065e36 in ?? ()
(cskygdb) disa
disable disassemble
(cskygdb) disa
disable disassemble
(cskygdb) disassemble
No function contains program counter for selected frame.
(cskygdb) disassemble $pc,$pc+30 ==》确认地址是否跟反汇编处的地址一样
Dump of assembler code from 0x65e36 to 0x65e54:
=> 0x00065e36: st r15, (r0, 24)
0x00065e38: st r8, (r0, 28)
0x00065e3a: mov r8, r0
0x00065e3c: st r2, (r8, 8)
0x00065e3e: st r3, (r8, 12)
0x00065e40: st r4, (r8, 16)
0x00065e42: bmaski r7, 0
0x00065e44: st r7, (r8, 0)
0x00065e46: ld r7, (r8, 12)
0x00065e48: bmaski r6, 8
0x00065e4a: andn r7, r7, r6
0x00065e4c: cmpnei r7, 0
0x00065e4e: bt 0x65e5c
0x00065e50: ld r2, (r8, 8)
0x00065e52: ld r3, (r8, 12)
End of assembler dump.
(cskygdb) add-symbol-file /home/yingc/nfs/dvb/out.elf 0x00080e0 ==》0x00080e0是text段的地址
add symbol table from file "/home/yingc/nfs/dvb/out.elf" at
.text_addr = 0x80e0
(y or n) y
Reading symbols from /home/yingc/nfs/dvb/out.elf...done.
(cskygdb) si
\0x00065e38 23 {
(cskygdb) l
18
19 #include "module/app_ioctl.h"
20 //#include "module/app_ca_manager.h"
21
22 status_t app_ioctl(uint32_t id, uint32_t cmd, void * params)
23 {
24 status_t ret = GXCORE_ERROR;
25 switch (cmd & (~0xff))
26 {
27 case APP_FRONTEND_BASE:
(cskygdb) n \yingc@yingc:~/work/goxceed-dvbs-hd/test/solution/output$ csky-elf-readelf -S out.elf
There are 28 section headers, starting at offset 0xa84da0: Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk Inf Al
[ 0] NULL 00000000 000000 000000 00 0 0 0
[ 1] .init PROGBITS 000080b4 0000b4 000022 00 AX 0 0 4
[ 2] .text PROGBITS 000080e0 0000e0 2f779a 00 AX 0 0 16
[ 3] .fini PROGBITS 002ff87c 2f787c 000016 00 AX 0 0 4
[ 4] .rodata PROGBITS 002ff8a0 2f78a0 071b60 00 A 0 0 16
[ 5] .eh_frame PROGBITS 00371400 369400 0013a8 00 A 0 0 4
[ 6] .tdata PROGBITS 003737a8 36a7a8 000004 00 WAT 0 0 4
[ 7] .tbss NOBITS 003737ac 36a7ac 000008 00 WAT 0 0 4
[ 8] .ctors PROGBITS 003737ac 36a7ac 000008 00 WA 0 0 4
[ 9] .dtors PROGBITS 003737b4 36a7b4 000008 00 WA 0 0 4
[10] .jcr PROGBITS 003737bc 36a7bc 000004 00 WA 0 0 4
[11] .got PROGBITS 003737c0 36a7c0 0000c4 04 WA 0 0 4
[12] .data PROGBITS 00373888 36a888 04a8f8 00 WA 0 0 8
[13] .bss NOBITS 003be180 3b5180 05a4cc 00 WA 0 0 8
[14] .comment PROGBITS 00000000 3b5180 000082 01 MS 0 0 1
[15] .debug_aranges PROGBITS 00000000 3b5202 008558 00 0 0 1
[16] .debug_pubnames PROGBITS 00000000 3bd75a 01cd87 00 0 0 1
[17] .debug_info PROGBITS 00000000 3da4e1 3b54ec 00 0 0 1
[18] .debug_abbrev PROGBITS 00000000 78f9cd 03ddac 00 0 0 1
[19] .debug_line PROGBITS 00000000 7cd779 19ac68 00 0 0 1
[20] .debug_frame PROGBITS 00000000 9683e4 043dc0 00 0 0 4
[21] .debug_str PROGBITS 00000000 9ac1a4 06262a 01 MS 0 0 1
[22] .debug_loc PROGBITS 00000000 a0e7ce 00e472 00 0 0 1
[23] .debug_pubtypes PROGBITS 00000000 a1cc40 061f78 00 0 0 1
[24] .debug_ranges PROGBITS 00000000 a7ebb8 0060e8 00 0 0 1
[25] .shstrtab STRTAB 00000000 a84ca0 0000fe 00 0 0 1
[26] .symtab SYMTAB 00000000 a85200 034710 10 27 7115 4
[27] .strtab STRTAB 00000000 ab9910 03845b 00 0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings)
I (info), L (link order), G (group), x (unknown)
O (extra OS processing required) o (OS specific), p (processor specific) 259129 00065e34 <app_ioctl>:
259130
259131 #include "module/app_ioctl.h"
259132 //#include "module/app_ca_manager.h"
259133
259134 status_t app_ioctl(uint32_t id, uint32_t cmd, void * params)
259135 {
259136 65e34:▸ 25f0 ▸ subi▸ r0, r0, 32
259137 65e36:▸ 9f60 ▸ st▸ r15, (r0, 24)
259138 65e38:▸ 9870 ▸ st▸ r8, (r0, 28)
259139 65e3a:▸ 1208 ▸ mov▸r8, r0
259140 65e3c:▸ 9228 ▸ st▸ r2, (r8, 8)
259141 65e3e:▸ 9338 ▸ st▸ r3, (r8, 12)
259142 65e40:▸ 9448 ▸ st▸ r4, (r8, 16)
259143 status_t ret = GXCORE_ERROR;
259144 65e42:▸ 2c07 ▸ bmaski▸ r7, 0
259145 65e44:▸ 9708 ▸ st▸ r7, (r8, 0)
259146 switch (cmd & (~0xff))
259147 65e46:▸ 8738 ▸ ld▸ r7, (r8, 12)
259148 65e48:▸ 2c86 ▸ bmaski▸ r6, 8
259149 65e4a:▸ 1f67 ▸ andn▸ r7, r7, r6
259150 65e4c:▸ 2a07 ▸ cmpnei▸ r7, 0
259151 65e4e:▸ e006 ▸ bt▸ 0x65e5c
259152 {
259153 case APP_FRONTEND_BASE:
259154 ret = nim_ioctl(id, cmd, params); 注意：hb 的个数有限制，即使disable的话，也可能会不响应下一个
Unable to handle kernel paging request at virtual address 00000000, epc == 90164fc4
。。。。。。
[ 54.940000] CURRENT PROCESS:
[ 54.940000]
[ 54.950000] COMM=out.elf PID=922
[ 54.950000] TEXT=00008000-0029e630 DATA=0029f630-0031d180 BSS=0031d180-0041e000
[ 54.960000] USER-STACK=7faa2e80 KERNEL-STACK=904ef560
[ 54.960000]
[ 54.960000] PC: 0x90164fc4
[ 54.970000] PSR: 0x8f150141
[ 54.970000] r1: 0x00000030 syscallr2: 0x0000e190 r2: 0x0000e190 r3: 0x00000000
[ 54.980000] r4: 0x9025908c r5: 0xe470e190 r6: 0xe40e0020 r7: 0x9023b08c
[ 54.990000] r8: 0x00000000 r9: 0x92cb4000 r10: 0x00001101 r11: 0x00000000
[ 54.990000] r12: 0x902e6ef4 r13: 0x00043800 r14: 0x9023b08c r15: 0x90162154
[ 55.000000]
[ 55.000000] CODE:
[ 55.010000] 90164fa4: 97361c47 75737e87 1ce41254 f00e12e7
[ 55.010000] 90164fb4: 3d06c607 1e26c217 3d05c527 1e25c237
[ 55.020000] 90164fc4: 12359503 96052035 20732077 e7f00f47
[ 55.020000] 90164fd4: 12236002 77637f7c 747b8607 75661c46
[ 55.030000]
[ 55.030000] KERNEL STACK:
[ 55.030000] 92cb5dc0: 00000000 92cb5e54 000000a0 00000000
[ 55.040000] 92cb5dd0: 0000011c 0000003b 902dd310 90029f84
Unable to handle kernel paging request at virtual address 00000000, epc == c07055f0 [root@gx3201 /]# lsmod
ohci_hcd 15264 0 - Live 0xc0074000
ehci_hcd 25520 0 - Live 0xc006c000
av 1121948 2 - Live 0xc06e2000 (cskygdb) p /x 0xc07055f0-0xc06e2000
$2 = 0x235f0
av.ko 反汇编：
105593 RetCode VPU_Init(PhysicalAddress workBuf,VirtualAddress Virtual_addr)
105594 235d6: 7547 lrw r5, 0x1E000
105595 235d8: 1254 mov r4, r5
105596 235da: 1ce4 addu r4, r4, r14
105597 disFlagRegAddr[0] = BIT_FRM_DIS_FLG_0;
105598 disFlagRegAddr[1] = BIT_FRM_DIS_FLG_1;
105599 disFlagRegAddr[2] = BIT_FRM_DIS_FLG_2;
105600 disFlagRegAddr[3] = BIT_FRM_DIS_FLG_3;
105601
105602 for (i = 0; i < sizeof(bit_code) / sizeof(bit_code[0]); i += 4)
105603 235dc: 12e7 mov r7, r14
105604 235de: f00e br 0x235fc
105605 {
105606 dataH = (bit_code[i+0] << 16) | bit_code[i+1];
105607 235e0: c607 ldh r6, (r7, 0)
105608 235e2: 3d06 lsli r6, r6, 16
105609 235e4: c217 ldh r2, (r7, 2)
105610 235e6: 1e26 or r6, r6, r2
105611 dataL = (bit_code[i+2] << 16) | bit_code[i+3];
105612 235e8: c527 ldh r5, (r7, 4)
105613 235ea: 3d05 lsli r5, r5, 16
105614 235ec: c237 ldh r2, (r7, 6)
105615 235ee: 1e25 or r5, r5, r2
105616 VpuWriteMem(vir_code_buf+i*2, dataL);
105617 235f0: 9503 st r5, (r3, 0)
105618 int VPU_IsBusy()
105619 {
105620 return VpuReadReg(BIT_BUSY_FLAG) != 0;
105621 }
105622
79 for (i = 0; i < sizeof(bit_code) / sizeof(bit_code[0]); i += 4)
80 {
81 dataH = (bit_code[i+0] << 16) | bit_code[i+1];
82 dataL = (bit_code[i+2] << 16) | bit_code[i+3];
83 VpuWriteMem(vir_code_buf+i*2, dataL);
84 VpuWriteMem(vir_code_buf+i*2+4, dataH);
85 }
gdb dump内存中的数据及查看代码段是否被冲：
(cskygdb) dump memory 111.yuv 0x94f54cc8 0x94f54cc8 + 0x450*200
(cskygdb) p 0x450
$7 = 1104 display -size 1104x200 111.yuv Loading section .text, size 0x64b628 lma 0x90000000
section progress: 100.0%, total progress: 100.0%
Loading section .devtab, size 0xa28 lma 0x9064b628
section progress: 100.0%, total progress: 100.0%
Start address 0x90000458, load size 6602832
Transfer rate: 853 KB/sec, 4093 bytes/write.
0x90000458 in __reset_vector ()
(cskygdb) 46edfc
Undefined command: "46edfc". Try "help".
(cskygdb) dump binary memory text.ok 0x90000000 0x90000000+0x46edfc
(cskygdb) c
Continuing.
^C
Program received signal SIGINT, Interrupt.
0x900e99ce in idle_thread_main (data=0)
at /home/yingc/work/gitcode/v1.9-dev/gxcoreapi/ecos3.0/packages/kernel/v3_0/src/common/thread.cxx:1244
1244 HAL_IDLE_THREAD_ACTION(idle_thread_loops[CYG_KERNEL_CPU_THIS()]);
(cskygdb) dump binary memory text1.ok 0x90000000 0x90000000+0x46edfc
(cskygdb) c 21 SECTIONS
22 {
23
24 .text : {
25 _start_text = .;
26 . = ALIGN (0x4);
27 . = ALIGN (0x4); *(.rel.*) *(.rela.*)
28 . = ALIGN (0x4); _stext = .; _etext = .; _ftext = . ; *(.text*) *(.stub)
29
30 . = ALIGN (0x4);
31 _sdata = . ;
32 __data_start = . ;
33 data_start = . ;
34 *(.got_plt)
35 *(.got)
36 FILL(0);
37 . = ALIGN(0x20) ;
38 LONG(-1)
39 . = ALIGN(0x20) ;
40 *(.rodata)
41 *(.rodata*)
42 *(.rodata1)
43 *(.rodata.*)
44 *(.rodata.str1.4)
45 *(.gnu.linkonce.r*)
46 *(.data)
47 *(.data*) 16434 9046ec14 T yaffs_ECCCalculateOther
16435 9046ecbc T yaffs_ECCCorrectOther
16436 9046edfc T __data_start
16437 9046edfc T _sdata
16438 9046edfc T data_start
16439 90473fc4 t __FUNCTION__.11312
16440 90473fd8 t __FUNCTION__.11303
16441 90473fec t __FUNCTION__.11293 ecos3.0/packages/hal/gx/ckmmu/ck610m/var/v3_0/src/ckmmu_ck610m.ld
gdb调试内核.gdbinit文件的写法：
1 tar jtag jtag://127.0.1.1:1025
2 handle SIG32 nostop noprint
3 handle SIG33 nostop noprint
4 #set $cr18=0x7d
5 #set *0x0030a178 |= 0x7
6 #set *0x0030a178 |= 0x3
7 #set *0x0030a178 |= (1<<4)|(1<<5)
8
9 load
10 #b main
11 #display /i $pc
12 #b IMG.c:1244
13 #b widget.c:968
14
15 #c
16 #q
编译中间结果：
2155 make ARCH=csky CROSS_COMPILE=csky-linux- uImage -j4
2156 make ARCH=csky CROSS_COMPILE=csky-linux- uImage -j4 V=1
2157 csky-linux-gcc -Wp,-MD,net/sunrpc/.rpcb_clnt.o.d -nostdinc -isystem /usr/local/csky-linux/bin/../lib/gcc/csky-linux/4.5.1/include -D__KERNEL__ -Iinclude -I/home/yingc/gcyin/vgitcode/3211-sync/linux-2.6.27.55/arch/csky/include -include include/linux/autoconf.h -mlittle-endian -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -fno-delete-null-pointer-checks -O0 -fsigned-char -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -fno-delete-null-pointer-checks -O0 -I -pipe -DNO_FPU -D__ELF__ -DMAGIC_ROM_PTR -D__linux__ -DNO_TEXT_SECTIONS -Wa,-no-jsri2bsr,-mcpu=ck610f -Iarch/csky/gx3xxx/include -Wframe-larger-than=1024 -fno-stack-protector -fomit-frame-pointer -g -Wdeclaration-after-statement -Wno-pointer-sign -fno-strict-overflow -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(rpcb_clnt)" -D"KBUILD_MODNAME=KBUILD_STR(sunrpc)" -c -o net/sunrpc/rpcb_clnt.o net/sunrpc/rpcb_clnt.c
2158 csky-linux-gcc -Wp,-MD,net/sunrpc/.rpcb_clnt.o.d -nostdinc -isystem /usr/local/csky-linux/bin/../lib/gcc/csky-linux/4.5.1/include -D__KERNEL__ -Iinclude -I/home/yingc/gcyin/vgitcode/3211-sync/linux-2.6.27.55/arch/csky/include -include include/linux/autoconf.h -mlittle-endian -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -fno-delete-null-pointer-checks -O0 -fsigned-char -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -fno-delete-null-pointer-checks -O0 -I -pipe -DNO_FPU -D__ELF__ -DMAGIC_ROM_PTR -D__linux__ -DNO_TEXT_SECTIONS -Wa,-no-jsri2bsr,-mcpu=ck610f -Iarch/csky/gx3xxx/include -Wframe-larger-than=1024 -fno-stack-protector -fomit-frame-pointer -g -Wdeclaration-after-statement -Wno-pointer-sign -fno-strict-overflow -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(rpcb_clnt)" -D"KBUILD_MODNAME=KBUILD_STR(sunrpc)" -c -o net/sunrpc/rpcb_clnt.o net/sunrpc/rpcb_clnt.c --save-temps
2159 vi rpcb_clnt.i
2160 vi net/sunrpc/rpcb_clnt.c +122 rpcb_clnt.i -O
2161 csky-linux-gcc -Wp,-MD,net/sunrpc/.rpcb_clnt.o.d -nostdinc -isystem /usr/local/csky-linux/bin/../lib/gcc/csky-linux/4.5.1/include -D__KERNEL__ -Iinclude -I/home/yingc/gcyin/vgitcode/3211-sync/linux-2.6.27.55/arch/csky/include -include include/linux/autoconf.h -mlittle-endian -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -fno-delete-null-pointer-checks -O0 -fsigned-char -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -fno-delete-null-pointer-checks -O2 -I -pipe -DNO_FPU -D__ELF__ -DMAGIC_ROM_PTR -D__linux__ -DNO_TEXT_SECTIONS -Wa,-no-jsri2bsr,-mcpu=ck610f -Iarch/csky/gx3xxx/include -Wframe-larger-than=1024 -fno-stack-protector -fomit-frame-pointer -g -Wdeclaration-after-statement -Wno-pointer-sign -fno-strict-overflow -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(rpcb_clnt)" -D"KBUILD_MODNAME=KBUILD_STR(sunrpc)" -c -o net/sunrpc/rpcb_clnt.o net/sunrpc/rpcb_clnt.c --save-temps
2162 vi rpcb_clnt.i
2163 history
linux下用GDB调试可加载模块
http://blog.csdn.net/justlinux2010/article/details/8508333
[root@gx6602 /]# lsmod
ohci_hcd 19028 0 - Live 0xc009e000
ehci_hcd 33276 0 - Live 0xc00b9000
fe 221368 0 - Live 0xc03c7000
av 1933852 0 - Live 0xc0b7f000
yingc@yingc:~/nfs/lib/modules/2.6.27.55$ csky-linux-objdump -h av.ko
av.ko: file format elf32-csky-little
Sections:
Idx Name Size VMA LMA File off Algn
0 .note.gnu.build-id 00000024 00000000 00000000 00000034 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
1 .text 000c1824 00000000 00000000 2**2
CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
2 .init.text 000001e8 00000000 00000000 000c187c 2**2
(cskygdb) add-symbol-file ~/nfs/lib/modules/2.6.27.55/av.ko
The address where /home/yingc/nfs/lib/modules/2.6.27.55/av.ko has been loaded is missing
(cskygdb) add-symbol-file ~/nfs/lib/modules/2.6.27.55/av.ko 0xc0b7f058
add symbol table from file "/home/yingc/nfs/lib/modules/2.6.27.55/av.ko" at
.text_addr = 0xc0b7f058
(y or n) y
Reading symbols from /home/yingc/nfs/lib/modules/2.6.27.55/av.ko...done.
(cskygdb) b gx3201_hdmi_open
yingc@yingc:~/tmp$ csky-linux-gcc -O0 -g -I/usr/local/csky-linux -I/usr/local/csky-linux/csky-linux -I/usr/local/csky-linux/csky-linux/libc/usr/include -L/usr/local/csky-linux/csky-linux/lib/libstdc++.a thread.c -L/usr/local/csky-linux/libc/usr/lib/libpthread.a -static
/tmp/ccCOd8La.o: In function `main':
/home/yingc/tmp/thread.c:31: undefined reference to `pthread_attr_init'
/home/yingc/tmp/thread.c:33: undefined reference to `pthread_attr_setstacksize'
/home/yingc/tmp/thread.c:35: undefined reference to `pthread_create'
/home/yingc/tmp/thread.c:41: undefined reference to `pthread_attr_destroy'
/tmp/ccCOd8La.o: In function `main':
thread.c:(.text+0x90): undefined reference to `pthread_attr_init'
thread.c:(.text+0x94): undefined reference to `pthread_attr_setstacksize'
thread.c:(.text+0x9c): undefined reference to `pthread_create'
thread.c:(.text+0xa8): undefined reference to `pthread_attr_destroy'
collect2: ld returned 1 exit status
yingc@yingc:~/tmp$
yingc@yingc:~/tmp$
yingc@yingc:~/tmp$
yingc@yingc:~/tmp$
yingc@yingc:~/tmp$ csky-linux-gcc -O0 -g -I/usr/local/csky-linux -I/usr/local/csky-linux/csky-linux -I/usr/local/csky-linux/csky-linux/libc/usr/include -L/usr/local/csky-linux/csky-linux/lib/libstdc++.a thread.c -L/usr/local/csky-linux/libc/usr/lib lpthread -static
csky-linux-gcc: lpthread: 没有那个文件或目录
yingc@yingc:~/tmp$
yingc@yingc:~/tmp$ csky-linux-gcc -O0 -g -I/usr/local/csky-linux -I/usr/local/csky-linux/csky-linux -I/usr/local/csky-linux/csky-linux/libc/usr/include -L/usr/local/csky-linux/csky-linux/lib/libstdc++.a thread.c -L/usr/local/csky-linux/libc/usr/lib -lpthread -static
yingc@yingc:~/tmp$
yingc@yingc:~/tmp$
yingc@yingc:~/tmp$
yingc@yingc:~/tmp$
yingc@yingc:~/tmp$ csky-linux-gcc -O0 -g -I/usr/local/csky-linux -I/usr/local/csky-linux/csky-linux -I/usr/local/csky-linux/csky-linux/libc/usr/include -L/usr/local/csky-linux/csky-linux/lib/libstdc++.a thread.c -L/usr/local/csky-linux/libc/usr/lib -lpthread -static
hello world的本质-----预编译,编译，汇编
gcc -E hello.c -o hello.i 这个命令就是用来生成预处理后的文件的。
生成汇编代码文件的命令
gcc -S hello.i -o hello.s
汇编命令
gcc -c hello.s -o hello.o
aa
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