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* cris/traps.c (TARGET_PIPE_BUF): New macro.

Browse source 
(cris_pipe_empty): Correct initialization of "remaining".  Only
	adjust the "write" return value if more than TARGET_PIPE_BUF bytes
	are written.
This commit is contained in:
Hans-Peter Nilsson 2006-09-30 02:38:06 +00:00
parent 539a52558f
commit eccd787e25
2 changed files with 31 additions and 13 deletions
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7
sim/ChangeLog
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@ -1,3 +1,10 @@
2006-09-30 Hans-Peter Nilsson <hp@axis.com>
* cris/traps.c (TARGET_PIPE_BUF): New macro.
(cris_pipe_empty): Correct initialization of "remaining". Only
adjust the "write" return value if more than TARGET_PIPE_BUF bytes
are written.
2006-09-29 Hans-Peter Nilsson <hp@axis.com>
* cris/configure.ac: Check for limits.h and sys/param.h.

37
sim/cris/traps.c
View file

@ -240,6 +240,9 @@ with this program; if not, write to the Free Software Foundation, Inc.,
#define TARGET___WALL 0x40000000
#define TARGET___WCLONE 0x80000000
/* From linux/limits.h. */
#define TARGET_PIPE_BUF 4096
static const char stat_map[] =
"st_dev,2:space,10:space,4:st_mode,4:st_nlink,4:st_uid,4"
":st_gid,4:st_rdev,2:space,10:st_size,8:st_blksize,4:st_blocks,4"
@ -2971,13 +2974,14 @@ cris_pipe_nonempty (host_callback *cb ATTRIBUTE_UNUSED,
static void
cris_pipe_empty (host_callback *cb,
int reader ATTRIBUTE_UNUSED,
int reader,
int writer)
{
int i;
SIM_CPU *cpu = current_cpu_for_cb_callback;
bfd_byte r10_buf[4];
int remaining = cb->pipe_buffer[writer].size;
int remaining
= cb->pipe_buffer[writer].size - cb->pipe_buffer[reader].size;
/* We need to find the thread that waits for this pipe. */
for (i = 0; i < SIM_TARGET_MAX_THREADS; i++)
@ -2985,6 +2989,7 @@ cris_pipe_empty (host_callback *cb,
&& cpu->thread_data[i].pipe_write_fd == writer)
{
int retval;
/* Temporarily switch to this cpu context, so we can change the
PC by ordinary calls. */
@ -2995,19 +3000,25 @@ cris_pipe_empty (host_callback *cb,
cpu->thread_data[i].cpu_context,
cpu->thread_cpu_data_size);
/* The return value is supposed to contain the number of written
bytes, which is the number of bytes requested and returned at
the write call. We subtract the remaining bytes from that,
but making sure we still get a positive number.
The return value may also be a negative number; an error
value. We cover this case by comparing against remaining,
which is always >= 0. */
/* The return value is supposed to contain the number of
written bytes, which is the number of bytes requested and
returned at the write call. You might think the right
thing is to adjust the return-value to be only the
*consumed* number of bytes, but it isn't. We're only
called if the pipe buffer is fully consumed or it is being
closed, possibly with remaining bytes. For the latter
case, the writer is still supposed to see success for
PIPE_BUF bytes (a constant which we happen to know and is
unlikely to change). The return value may also be a
negative number; an error value. This case is covered
because "remaining" is always >= 0. */
(*CPU_REG_FETCH (cpu)) (cpu, H_GR_R10, r10_buf, 4);
retval = (int) bfd_getl_signed_32 (r10_buf);
if (retval >= remaining)
bfd_putl32 (retval - remaining, r10_buf);
(*CPU_REG_STORE (cpu)) (cpu, H_GR_R10, r10_buf, 4);
if (retval - remaining > TARGET_PIPE_BUF)
{
bfd_putl32 (retval - remaining, r10_buf);
(*CPU_REG_STORE (cpu)) (cpu, H_GR_R10, r10_buf, 4);
}
sim_pc_set (cpu, sim_pc_get (cpu) + 2);
memcpy (cpu->thread_data[i].cpu_context,
&cpu->cpu_data_placeholder,