diff options
Diffstat (limited to 'src/pkg/runtime/stack.h')
| -rw-r--r-- | src/pkg/runtime/stack.h | 24 |
1 files changed, 14 insertions, 10 deletions
diff --git a/src/pkg/runtime/stack.h b/src/pkg/runtime/stack.h index 06b0c568c..296eb688d 100644 --- a/src/pkg/runtime/stack.h +++ b/src/pkg/runtime/stack.h @@ -71,21 +71,19 @@ enum { // The amount of extra stack to allocate beyond the size // needed for the single frame that triggered the split. - StackExtra = 1024, + StackExtra = 2048, // The minimum stack segment size to allocate. // If the amount needed for the splitting frame + StackExtra // is less than this number, the stack will have this size instead. - StackMin = 4096, + StackMin = 8192, FixedStack = StackMin + StackSystem, - // Functions that need frames bigger than this call morestack - // unconditionally. That is, on entry to a function it is assumed - // that the amount of space available in the current stack segment - // couldn't possibly be bigger than StackBig. If stack segments - // do run with more space than StackBig, the space may not be - // used efficiently. As a result, StackBig should not be significantly - // smaller than StackMin or StackExtra. + // Functions that need frames bigger than this use an extra + // instruction to do the stack split check, to avoid overflow + // in case SP - framesize wraps below zero. + // This value can be no bigger than the size of the unmapped + // space at zero. StackBig = 4096, // The stack guard is a pointer this many bytes above the @@ -104,5 +102,11 @@ enum { // The assumed size of the top-of-stack data block. // The actual size can be smaller than this but cannot be larger. // Checked in proc.c's runtime.malg. - StackTop = 72, + StackTop = 96, }; + +// Goroutine preemption request. +// Stored into g->stackguard0 to cause split stack check failure. +// Must be greater than any real sp. +// 0xfffffade in hex. +#define StackPreempt ((uint64)-1314) |