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Query page size on Apple platforms (#3)

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This fixes support for text segments larger than 4096 bytes on iOS
systems with 16K pages.
This commit is contained in:
Francesco Tamagni 2020-03-25 02:59:15 +01:00 committed by GitHub
parent 17df98d861
commit ebfb419a72
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 16 additions and 5 deletions
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21
tccrun.c
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@ -55,6 +55,10 @@ static void *win64_add_function_table(TCCState *s1);
static void win64_del_function_table(void *);
#endif
#ifdef __APPLE__
static addr_t cached_page_size = 0;
#endif
/* ------------------------------------------------------------- */
/* Do all relocations (needed before using tcc_get_symbol())
Returns -1 on error. */
@ -292,13 +296,20 @@ static void set_pages_executable(void *ptr, unsigned long length)
#else
void __clear_cache(void *beginning, void *end);
# ifndef HAVE_SELINUX
addr_t start, end;
# ifndef PAGESIZE
# define PAGESIZE 4096
addr_t start, end, pagesize;
# ifdef __APPLE__
if (0 == cached_page_size)
cached_page_size = getpagesize();
pagesize = cached_page_size;
# else
# ifndef PAGESIZE
# define PAGESIZE 4096
# endif
pagesize = PAGESIZE;
# endif
start = (addr_t)ptr & ~(PAGESIZE - 1);
start = (addr_t)ptr & ~(pagesize - 1);
end = (addr_t)ptr + length;
end = (end + PAGESIZE - 1) & ~(PAGESIZE - 1);
end = (end + pagesize - 1) & ~(pagesize - 1);
if (mprotect((void *)start, end - start, PROT_READ | PROT_WRITE | PROT_EXEC))
tcc_error("mprotect failed: did you mean to configure --with-selinux?");
# endif