[POWERPC] spufs: provide siginfo for SPE faults

This change populates a siginfo struct for SPE application exceptions
(ie, invalid DMAs and illegal instructions).

Tested on an IBM Cell Blade.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

diff --git a/arch/powerpc/platforms/cell/spufs/fault.c b/arch/powerpc/platforms/cell/spufs/fault.c
index 182dc91..0f75c07 100644 (file)
--- a/arch/powerpc/platforms/cell/spufs/fault.c
+++ b/arch/powerpc/platforms/cell/spufs/fault.c
@@ -97,28 +97,46 @@ bad_area:
        return -EFAULT;
 }
 
-static void spufs_handle_dma_error(struct spu_context *ctx, int type)
+static void spufs_handle_dma_error(struct spu_context *ctx,
+                               unsigned long ea, int type)
 {
        if (ctx->flags & SPU_CREATE_EVENTS_ENABLED) {
                ctx->event_return |= type;
                wake_up_all(&ctx->stop_wq);
        } else {
+               siginfo_t info;
+               memset(&info, 0, sizeof(info));
+
                switch (type) {
-               case SPE_EVENT_DMA_ALIGNMENT:
-               case SPE_EVENT_SPE_DATA_STORAGE:
                case SPE_EVENT_INVALID_DMA:
-                       force_sig(SIGBUS, /* info, */ current);
+                       info.si_signo = SIGBUS;
+                       info.si_code = BUS_OBJERR;
+                       break;
+               case SPE_EVENT_SPE_DATA_STORAGE:
+                       info.si_signo = SIGBUS;
+                       info.si_addr = (void __user *)ea;
+                       info.si_code = BUS_ADRERR;
+                       break;
+               case SPE_EVENT_DMA_ALIGNMENT:
+                       info.si_signo = SIGBUS;
+                       /* DAR isn't set for an alignment fault :( */
+                       info.si_code = BUS_ADRALN;
                        break;
                case SPE_EVENT_SPE_ERROR:
-                       force_sig(SIGILL, /* info */ current);
+                       info.si_signo = SIGILL;
+                       info.si_addr = (void __user *)(unsigned long)
+                               ctx->ops->npc_read(ctx) - 4;
+                       info.si_code = ILL_ILLOPC;
                        break;
                }
+               if (info.si_signo)
+                       force_sig_info(info.si_signo, &info, current);
        }
 }
 
 void spufs_dma_callback(struct spu *spu, int type)
 {
-       spufs_handle_dma_error(spu->ctx, type);
+       spufs_handle_dma_error(spu->ctx, spu->dar, type);
 }
 EXPORT_SYMBOL_GPL(spufs_dma_callback);
 
@@ -186,7 +204,7 @@ int spufs_handle_class1(struct spu_context *ctx)
                if (ctx->spu)
                        ctx->ops->restart_dma(ctx);
        } else
-               spufs_handle_dma_error(ctx, SPE_EVENT_SPE_DATA_STORAGE);
+               spufs_handle_dma_error(ctx, ea, SPE_EVENT_SPE_DATA_STORAGE);
 
        return ret;
 }