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rt: Put 16 guard bytes at the end of the stack

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This commit is contained in:
Brian Anderson 2011-12-06 17:19:24 -08:00
parent 5d1a1dc420
commit 9656ceac60
1 changed files with 15 additions and 2 deletions
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17
src/rt/rust_task.cpp
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@ -14,15 +14,22 @@
#include "globals.h"
// Each stack gets some guard bytes that valgrind will verify we don't touch
#ifndef NVALGRIND
#define STACK_NOACCESS_SIZE 16
#else
#define STACK_NOACCESS_SIZE 0
#endif
// The amount of extra space at the end of each stack segment, available
// to the rt, compiler and dynamic linker for running small functions
// FIXME: We want this to be 128 but need to slim the red zone calls down
#ifdef __i386__
#define RED_ZONE_SIZE 65536
#define RED_ZONE_SIZE (65536 + STACK_NOACCESS_SIZE)
#endif
#ifdef __x86_64__
#define RED_ZONE_SIZE 65536
#define RED_ZONE_SIZE (65536 + STACK_NOACCESS_SIZE)
#endif
// Stack size
@ -56,6 +63,9 @@ new_stk(rust_scheduler *sched, rust_task *task, size_t minsz)
stk->valgrind_id =
VALGRIND_STACK_REGISTER(&stk->data[0],
&stk->data[minsz + RED_ZONE_SIZE]);
#ifndef NVALGRIND
VALGRIND_MAKE_MEM_NOACCESS(stk->data, STACK_NOACCESS_SIZE);
#endif
task->stk = stk;
return stk;
}
@ -67,6 +77,9 @@ del_stk(rust_task *task, stk_seg *stk)
task->stk = stk->next;
#ifndef NVALGRIND
VALGRIND_MAKE_MEM_DEFINED(stk->data, STACK_NOACCESS_SIZE);
#endif
VALGRIND_STACK_DEREGISTER(stk->valgrind_id);
LOGPTR(task->sched, "freeing stk segment", (uintptr_t)stk);
task->free(stk);