"PRC" <panruochen@xxxxxxxxx> writes: > I want to have a stack overflow check on my program running on MIPS. > I use the `-fstack-check' option to recompile all the source code. > But when I check the objdump file, there doesn't seem that any code relating to > stack check is generated by gcc. I try again with a i386-redhat-linux gcc on my > PC, and there is still no stack-check code generated. > > so, I wonder, is stack-check not implemented for mipsel-linux-gcc and > i386-redhat-linux-gcc? What the option does for most targets is insert stack probes at every page (default: every 4096 bytes) at the start of a function. This is only done for functions with large frames. The code assumes that the OS has put a guard page at the bottom of the stack. By inserting stack probes, it ensures that if you create a very large stack--e.g. a local "int a[10000]"--you will get a stack overflow warning when entering the function, rather than letting your code use elements of the array which may be so large that they pass through your stack into the stack of another thread. Ian
