diff options
Diffstat (limited to 'exec.c')
| -rw-r--r-- | exec.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/exec.c b/exec.c index 0daeaabe25..7c8864c8b7 100644 --- a/exec.c +++ b/exec.c @@ -1875,6 +1875,33 @@ void page_set_flags(target_ulong start, target_ulong end, int flags) spin_unlock(&tb_lock); } +int page_check_range(target_ulong start, target_ulong len, int flags) +{ + PageDesc *p; + target_ulong end; + target_ulong addr; + + end = TARGET_PAGE_ALIGN(start+len); /* must do before we loose bits in the next step */ + start = start & TARGET_PAGE_MASK; + + if( end < start ) + /* we've wrapped around */ + return -1; + for(addr = start; addr < end; addr += TARGET_PAGE_SIZE) { + p = page_find(addr >> TARGET_PAGE_BITS); + if( !p ) + return -1; + if( !(p->flags & PAGE_VALID) ) + return -1; + + if (!(p->flags & PAGE_READ) && (flags & PAGE_READ) ) + return -1; + if (!(p->flags & PAGE_WRITE) && (flags & PAGE_WRITE) ) + return -1; + } + return 0; +} + /* called from signal handler: invalidate the code and unprotect the page. Return TRUE if the fault was succesfully handled. */ int page_unprotect(target_ulong address, unsigned long pc, void *puc) |