redonkable/alistair23-linux
redonkable/alistair23-linux
1
0
Fork 0
Code Releases Activity

[POWERPC] spufs: Add support for SPU single stepping

Browse source 
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
Show stats Download patch file Download diff file Expand all files Collapse all files

12
arch/powerpc/platforms/cell/spufs/run.c
View file

@ -142,8 +142,12 @@ static int spu_run_init(struct spu_context *ctx, u32 * npc)
runcntl = SPU_RUNCNTL_RUNNABLE;
ctx->ops->runcntl_write(ctx, runcntl);
} else {
unsigned long mode = SPU_PRIVCNTL_MODE_NORMAL;
spu_start_tick(ctx);
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);
}
@ -334,7 +338,8 @@ long spufs_run_spu(struct file *file, struct spu_context *ctx,
ret = spu_process_events(ctx);
} 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);
ret = spu_run_fini(ctx, npc, &status);
@ -344,10 +349,15 @@ out2:
if ((ret == 0) ||
((ret == -ERESTARTSYS) &&
((status & SPU_STATUS_STOPPED_BY_HALT) ||
(status & SPU_STATUS_SINGLE_STEP) ||
((status & SPU_STATUS_STOPPED_BY_STOP) &&
(status >> SPU_STOP_STATUS_SHIFT != 0x2104)))))
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)
&& (status >> SPU_STOP_STATUS_SHIFT) == 0x3fff) {
force_sig(SIGTRAP, current);