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Code Issues Releases Wiki Activity

research st, expand MD_INIT_CONTEXT macro, the thread start.

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This commit is contained in:
winlin 2014-11-10 13:52:17 +08:00
parent 8da8c49f39
commit 2c01f7e943
5 changed files with 73 additions and 44 deletions
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41
trunk/research/arm/jmp_sp.cpp
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@ -9,15 +9,20 @@
#include <stdlib.h>
#include <setjmp.h>
jmp_buf env_func1;
jmp_buf context;
void func1()
{
#if defined(__amd64__) || defined(__x86_64__)
register long int rsp0 asm("rsp");
int ret = setjmp(env_func1);
printf("setjmp func0 ret=%d, rsp=%#lx\n", ret, rsp0);
int ret = setjmp(context);
printf("setjmp func1 ret=%d, rsp=%#lx\n", ret, rsp0);
// enter by longjmp
if (ret != 0) {
printf("call by longjmp.\n");
exit(0);
}
#endif
}
@ -49,15 +54,15 @@ void func0()
// for glibc 2.4+, it's not possible to get and set the sp in jmp_buf
/**
for example, the following is show the jmp_buf when setjmp:
(gdb) x /64xb env_func1[0].__jmpbuf
0x600ca0 <env_func1>: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
0x600ca8 <env_func1+8>: 0xf8 0xc1 0x71 0xe5 0xa8 0x88 0xb4 0x15
0x600cb0 <env_func1+16>: 0xa0 0x05 0x40 0x00 0x00 0x00 0x00 0x00
0x600cb8 <env_func1+24>: 0x90 0xe4 0xff 0xff 0xff 0x7f 0x00 0x00
0x600cc0 <env_func1+32>: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
0x600cc8 <env_func1+40>: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
0x600cd0 <env_func1+48>: 0xf8 0xc1 0x51 0xe5 0xa8 0x88 0xb4 0x15
0x600cd8 <env_func1+56>: 0xf8 0xc1 0xd9 0x2f 0xd7 0x77 0x4b 0xea
(gdb) x /64xb context[0].__jmpbuf
0x600ca0 <context>: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
0x600ca8 <context+8>: 0xf8 0xc1 0x71 0xe5 0xa8 0x88 0xb4 0x15
0x600cb0 <context+16>: 0xa0 0x05 0x40 0x00 0x00 0x00 0x00 0x00
0x600cb8 <context+24>: 0x90 0xe4 0xff 0xff 0xff 0x7f 0x00 0x00
0x600cc0 <context+32>: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
0x600cc8 <context+40>: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
0x600cd0 <context+48>: 0xf8 0xc1 0x51 0xe5 0xa8 0x88 0xb4 0x15
0x600cd8 <context+56>: 0xf8 0xc1 0xd9 0x2f 0xd7 0x77 0x4b 0xea
(gdb) p /x $sp
$4 = 0x7fffffffe380
we cannot finger the sp out.
@ -65,12 +70,12 @@ void func0()
*/
register long int rsp0 asm("rsp");
int ret = setjmp(env_func1);
int ret = setjmp(context);
printf("setjmp func0 ret=%d, rsp=%#lx\n", ret, rsp0);
printf("after setjmp: ");
for (int i = 0; i < 8; i++) {
printf("env[%d]=%#x, ", i, (int)env_func1[0].__jmpbuf[i]);
printf("env[%d]=%#x, ", i, (int)context[0].__jmpbuf[i]);
}
printf("\n");
@ -100,7 +105,7 @@ void func0()
*/
/**
For example, on raspberry-pi, armv6 cpu:
(gdb) x /64 env_func1[0].__jmpbuf
(gdb) x /64 context[0].__jmpbuf
v1, 0: 0x00 0x00 0x00 0x00
v2, 1: 0x00 0x00 0x00 0x00
v3, 2: 0x2c 0x84 0x00 0x00
@ -116,19 +121,18 @@ void func0()
(gdb) p /x $pc
$4 = 0x850c
*/
int ret = setjmp(env_func1);
int ret = setjmp(context);
printf("setjmp func1 ret=%d\n", ret);
printf("after setjmp: ");
for (int i = 0; i < 64; i++) {
printf("env[%d]=%#x, ", i, (int)env_func1[0].__jmpbuf[i]);
printf("env[%d]=%#x, ", i, (int)context[0].__jmpbuf[i]);
}
printf("func0 terminated\n");
#endif
}
extern uintptr_t _jmpbuf_sp (__jmp_buf regs);
int main(int argc, char** argv) {
#if defined(__amd64__) || defined(__x86_64__)
printf("x86_64 sizeof(long int)=%d, sizeof(long)=%d, "
@ -143,6 +147,7 @@ int main(int argc, char** argv) {
#endif
func0();
longjmp(context, 1);
printf("terminated\n");