separate SIGSEGV handler from jkmalloc() so it can be installed without requiring dynamic memory use

1 files changed, 37 insertions, 0 deletions

diff --git a/src/stdlib/_jkmalloc.h b/src/stdlib/_jkmalloc.h
index cab5cfcb..107bf904 100644
--- a/src/stdlib/_jkmalloc.h
+++ b/src/stdlib/_jkmalloc.h
@@ -3,6 +3,43 @@
 
 #include <inttypes.h>
 
+#define PTR_BITS        (CHAR_BIT * sizeof(uintptr_t))
+
+#define JKMALLOC_EXIT_VALUE     (127 + SIGSEGV)
+#define JK_FREE_LIST_SIZE       (8)
+
+#define __jk_pagesize		(4096)
+
+/* magic numbers derived from CRC-32 of jk_foo_block */
+#define JK_FREE_MAGIC           (0x551a51dc)
+#define JK_UNDER_MAGIC          (0xcb2873ac)
+#define JK_OVER_MAGIC           (0x18a12c17)
+#define JK_RONLY_MAGIC          (0x902faf31)
+
+#define jk_pages(bytes)         (((bytes + __jk_pagesize - 1) / __jk_pagesize) + 2)
+#define jk_pageof(addr)         ((void*)((uintptr_t)addr - ((uintptr_t)addr % __jk_pagesize)))
+#define jk_bucketof(addr)       ((void*)((uintptr_t)jk_pageof(addr) - __jk_pagesize))
+
+
+struct jk_bucket {
+        uint32_t magic;
+        uintptr_t start;
+        size_t size;
+        size_t align;
+        size_t pages;
+        size_t tlen;
+        char trace[];
+};
+
+
+struct jk_source {
+        const char *file;
+        const char *func;
+        uintmax_t line;
+        struct jk_bucket *bucket;
+};
+
+
 void* __jkmalloc(void *ptr, size_t alignment, size_t size1 , size_t size2, const char *user);
 
 #endif