41 lines
1.4 KiB
Text
41 lines
1.4 KiB
Text
Index: libco/x86.c
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--- libco/x86.c.orig
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+++ libco/x86.c
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@@ -3,6 +3,8 @@
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#include "settings.h"
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#include <assert.h>
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+#include <err.h>
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+#include <stdint.h>
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#include <stdlib.h>
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#ifdef __cplusplus
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@@ -76,6 +78,7 @@ cothread_t co_active() {
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cothread_t co_create(unsigned int size, void (*entrypoint)(void)) {
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cothread_t handle;
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+ long pagesize, newsize;
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if(!co_swap) {
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co_init();
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co_swap = (void (fastcall*)(cothread_t, cothread_t))co_swap_function;
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@@ -84,7 +87,19 @@ cothread_t co_create(unsigned int size, void (*entrypo
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size += 256; /* allocate additional space for storage */
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size &= ~15; /* align stack to 16-byte boundary */
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- if(handle = (cothread_t)malloc(size)) {
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+ pagesize = sysconf(_SC_PAGESIZE);
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+ if(pagesize == -1)
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+ err(1, "sysconf failed");
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+ newsize = size / pagesize * pagesize + !!(size % pagesize) * pagesize;
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+ handle = (cothread_t)malloc(newsize);
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+ if(handle == NULL)
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+ err(1, "malloc failed");
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+ if((uintptr_t)handle % pagesize)
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+ err(1, "misaligned allocation");
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+ handle = (cothread_t)mmap(handle, newsize, PROT_READ|PROT_WRITE, MAP_FIXED|MAP_STACK|MAP_PRIVATE|MAP_ANON, -1, 0);
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+ if(handle == MAP_FAILED)
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+ err(1, "mmap failed");
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+ else {
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long *p = (long*)((char*)handle + size); /* seek to top of stack */
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*--p = (long)crash; /* crash if entrypoint returns */
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*--p = (long)entrypoint; /* start of function */
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