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[POWERPC] spufs: Add support for SPU single stepping

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This patch adds support for SPU single stepping. The single
step bit is set in the SPU when the current process is
being single-stepped via ptrace. The spu then stops and
returns with a specific flag set and the syscall exit code
will generate the SIGTRAP.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Benjamin Herrenschmidt
2007-06-04 15:15:37 +10:00
committed by Paul Mackerras
parent 3d5134ee83
commit 05169237b5
1 changed files with 11 additions and 1 deletions
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12
arch/powerpc/platforms/cell/spufs/run.c
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@@ -142,8 +142,12 @@ static int spu_run_init(struct spu_context *ctx, u32 * npc)
runcntl = SPU_RUNCNTL_RUNNABLE; runcntl = SPU_RUNCNTL_RUNNABLE;
ctx->ops->runcntl_write(ctx, runcntl); ctx->ops->runcntl_write(ctx, runcntl);
} else { } else {
unsigned long mode = SPU_PRIVCNTL_MODE_NORMAL;
spu_start_tick(ctx); spu_start_tick(ctx);
ctx->ops->npc_write(ctx, *npc); ctx->ops->npc_write(ctx, *npc);
if (test_thread_flag(TIF_SINGLESTEP))
mode = SPU_PRIVCNTL_MODE_SINGLE_STEP;
out_be64(&ctx->spu->priv2->spu_privcntl_RW, mode);
ctx->ops->runcntl_write(ctx, SPU_RUNCNTL_RUNNABLE); ctx->ops->runcntl_write(ctx, SPU_RUNCNTL_RUNNABLE);
} }
@@ -334,7 +338,8 @@ long spufs_run_spu(struct file *file, struct spu_context *ctx,
ret = spu_process_events(ctx); ret = spu_process_events(ctx);
} while (!ret && !(status & (SPU_STATUS_STOPPED_BY_STOP | } while (!ret && !(status & (SPU_STATUS_STOPPED_BY_STOP |
SPU_STATUS_STOPPED_BY_HALT))); SPU_STATUS_STOPPED_BY_HALT |
SPU_STATUS_SINGLE_STEP)));
ctx->ops->master_stop(ctx); ctx->ops->master_stop(ctx);
ret = spu_run_fini(ctx, npc, &status); ret = spu_run_fini(ctx, npc, &status);
@@ -344,10 +349,15 @@ out2:
if ((ret == 0) || if ((ret == 0) ||
((ret == -ERESTARTSYS) && ((ret == -ERESTARTSYS) &&
((status & SPU_STATUS_STOPPED_BY_HALT) || ((status & SPU_STATUS_STOPPED_BY_HALT) ||
(status & SPU_STATUS_SINGLE_STEP) ||
((status & SPU_STATUS_STOPPED_BY_STOP) && ((status & SPU_STATUS_STOPPED_BY_STOP) &&
(status >> SPU_STOP_STATUS_SHIFT != 0x2104))))) (status >> SPU_STOP_STATUS_SHIFT != 0x2104)))))
ret = status; ret = status;
/* Note: we don't need to force_sig SIGTRAP on single-step
* since we have TIF_SINGLESTEP set, thus the kernel will do
* it upon return from the syscall anyawy
*/
if ((status & SPU_STATUS_STOPPED_BY_STOP) if ((status & SPU_STATUS_STOPPED_BY_STOP)
&& (status >> SPU_STOP_STATUS_SHIFT) == 0x3fff) { && (status >> SPU_STOP_STATUS_SHIFT) == 0x3fff) {
force_sig(SIGTRAP, current); force_sig(SIGTRAP, current);