diff options
Diffstat (limited to 'gcc/testsuite/gcc.target/i386/pr39804.c')
-rw-r--r-- | gcc/testsuite/gcc.target/i386/pr39804.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.target/i386/pr39804.c b/gcc/testsuite/gcc.target/i386/pr39804.c new file mode 100644 index 000000000..3ff247908 --- /dev/null +++ b/gcc/testsuite/gcc.target/i386/pr39804.c @@ -0,0 +1,31 @@ +/* { dg-do compile } */ +/* { dg-require-effective-target ilp32 } */ +/* { dg-options "-O" } */ + +typedef unsigned char u8; +struct __large_struct { unsigned long buf[100]; }; +static inline __attribute__((always_inline)) unsigned long +__copy_from_user_inatomic(void *to, const void *from, unsigned long n) +{ + unsigned long ret = 0; + asm volatile("1: mov""b"" %2,%""b""1\n" "2:\n" + ".section .fixup,\"ax\"\n" + "3: mov %3,%0\n" + " xor""b"" %""b""1,%""b""1\n" + " jmp 2b\n" + ".previous\n" + " .section __ex_table,\"a\"\n" + " " ".balign 4" " " "\n" + " " ".long" " " "1b" "," "3b" "\n" + " .previous\n" + : "=r" (ret), "=q"(*(u8 *)to) + : "m" ((*(struct __large_struct *)(from))), "i" (1), "0" (ret)); + return ret; +} +void romchecksum(const unsigned char *rom, unsigned char c) +{ + unsigned char sum; + for (sum = 0; + !__copy_from_user_inatomic(&(c), ( typeof(c) *)(rom++), sizeof(c));) + sum += c; +} |