ARC: Enable unaligned access in hardware if compiler uses it

Even if ARC core might handle unaligned access to data this
hardware feature by default is disabled.

But GCC starting from 8.1.0 unconditionally uses it for ARC HS cores.
Which leads to quite strange and fatal run-time failures like the one
below if HW is not configured properly:
| hsdk# sf probe
| Misaligned data access exception @ 0xbff794d4
| ECR:    0x000d0000
| RET:    0xbff794d4
| BLINK:  0xbff79644
| STAT32: 0x00000800
| GP: 0x1003e000   r25: 0xbfd58f08
| BTA: 0xbff794a4  SP: 0xbfd58cd4  FP: 0xbfd58ef0
| LPS: 0xbff90240 LPE: 0xbff90244 LPC: 0x00000000
| r00: 0x00000000 r01: 0x00000003 r02: 0x000026bf
| r03: 0x00000000 r04: 0x00000100 r05: 0x00000000
| r06: 0x00000001 r07: 0x00000000 r08: 0x1dcd6500
| r09: 0x00000000 r10: 0x00200000 r11: 0x00000000
| r12: 0x1b3d4440 r13: 0xbff9eca4 r14: 0xbfd59d68
| r15: 0xbfd60cd0 r16: 0x00000000 r17: 0x00000000
| r18: 0xbff9ed14 r19: 0xbfd59c78 r20: 0xbfd58d40
| r21: 0xbfd58d44 r22: 0x00000000 r23: 0x00000000
| r24: 0xbfd59ba8
| Resetting CPU ...

Now we're checking for __ARC_UNALIGNED__ define emitted by the
compiler if it's going to use unaligned access and then we
force-enable it in hardware too.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

diff --git a/arch/arc/include/asm/arcregs.h b/arch/arc/include/asm/arcregs.h
index 56ec11f789b525e529aa5911b69166e4ea5aee09..9920d2e71952e10e3c956a41bee00391141d4759 100644 (file)
--- a/arch/arc/include/asm/arcregs.h
+++ b/arch/arc/include/asm/arcregs.h
@@ -19,6 +19,9 @@
 #define ARC_AUX_IDENTITY       0x04
 #define ARC_AUX_STATUS32       0x0a
 
+/* STATUS32 Bits Positions */
+#define STATUS_AD_BIT          19      /* Enable unaligned access */
+
 /* Instruction cache related auxiliary registers */
 #define ARC_AUX_IC_IVIC                0x10
 #define ARC_AUX_IC_CTRL                0x11

diff --git a/arch/arc/lib/start.S b/arch/arc/lib/start.S
index e573ce7718b9bd38b370b215032df1397d569809..84959b41bdf5eafffd33b673780e2ddd83997db1 100644 (file)
--- a/arch/arc/lib/start.S
+++ b/arch/arc/lib/start.S
@@ -61,6 +61,15 @@ ENTRY(_start)
 1:
 #endif
 
+#ifdef __ARC_UNALIGNED__
+       /*
+        * Enable handling of unaligned access in the CPU as by default
+        * this HW feature is disabled while GCC starting from 8.1.0
+        * unconditionally uses it for ARC HS cores.
+        */
+       flag    1 << STATUS_AD_BIT
+#endif
+
        /* Establish C runtime stack and frame */
        mov     %sp, CONFIG_SYS_INIT_SP_ADDR
        mov     %fp, %sp