From: Mike Frysinger vapier@gentoo.org
Newer gcc versions will sometimes use a Preg when "r" constraints, but that'll fail if we use an Ireg in the assignment. So force the code to always use a Dreg.
This also fixes early boot crashes for older Blackfin parts when compiled with gcc-4.5. This version ends up selecting the same register for the input and output variables which corrupts the output assignment triggering an exception. P2 = 0xffe02008; /* EVT2 */ R0 = RETS; CALL 1f; RTN; 1: P2 = RETS; <-- BAD RETS = R0; [P2] = P2; <-- BAD
Signed-off-by: Mike Frysinger vapier@gentoo.org Signed-off-by: Sonic Zhang sonic.zhang@analog.com --- arch/blackfin/cpu/initcode.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/arch/blackfin/cpu/initcode.c b/arch/blackfin/cpu/initcode.c index 1a06680..e8ea0ba 100644 --- a/arch/blackfin/cpu/initcode.c +++ b/arch/blackfin/cpu/initcode.c @@ -262,7 +262,8 @@ program_nmi_handler(void) "%1 = RETS;" /* Load addr of NMI handler */ "RETS = %0;" /* Restore RETS */ "[%2] = %1;" /* Write NMI handler */ - : "=r"(tmp1), "=r"(tmp2) : "ab"(EVT2) + : "=d"(tmp1), "=d"(tmp2) + : "ab"(EVT2) ); }