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authorMike Frysinger <vapier@gentoo.org>2011-01-11 17:58:56 +0000
committerMike Frysinger <vapier@gentoo.org>2011-01-11 17:58:56 +0000
commit3143e5a930bd71ff2ddd889f906f9df3631a1ae7 (patch)
tree2038581e42a00498fb1ca109384f60b7393b00bc /sim/common/sim-memopt.c
parent9b20d036b6804e167f6b3a843661022ed46399bb (diff)
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sim: allow memory maps to default to mapped files
I find it annoying when using --memory-mapfile that I also need to look up and manually specify the file size to the following --memory-region option. So make a length of 0 in the following --memory-region trigger an auto-sizing of the map to the length of the file being mapped. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'sim/common/sim-memopt.c')
-rw-r--r--sim/common/sim-memopt.c40
1 files changed, 30 insertions, 10 deletions
diff --git a/sim/common/sim-memopt.c b/sim/common/sim-memopt.c
index 8aa36ff..142f3a6 100644
--- a/sim/common/sim-memopt.c
+++ b/sim/common/sim-memopt.c
@@ -154,7 +154,27 @@ do_memopt_add (SIM_DESC sd,
/* Allocate new well-aligned buffer, just as sim_core_attach(). */
void *aligned_buffer;
int padding = (addr % sizeof (unsigned64));
- unsigned long bytes = (modulo == 0 ? nr_bytes : modulo) + padding;
+ unsigned long bytes;
+
+#ifdef HAVE_MMAP
+ struct stat s;
+
+ if (mmap_next_fd >= 0)
+ {
+ /* Check that given file is big enough. */
+ int rc = fstat (mmap_next_fd, &s);
+
+ if (rc < 0)
+ sim_io_error (sd, "Error, unable to stat file: %s\n",
+ strerror (errno));
+
+ /* Autosize the mapping to the file length. */
+ if (nr_bytes == 0)
+ nr_bytes = s.st_size;
+ }
+#endif
+
+ bytes = (modulo == 0 ? nr_bytes : modulo) + padding;
free_buffer = NULL;
free_length = bytes;
@@ -163,14 +183,9 @@ do_memopt_add (SIM_DESC sd,
/* Memory map or malloc(). */
if (mmap_next_fd >= 0)
{
- /* Check that given file is big enough. */
- struct stat s;
- int rc;
-
/* Some kernels will SIGBUS the application if mmap'd file
is not large enough. */
- rc = fstat (mmap_next_fd, &s);
- if (rc < 0 || s.st_size < bytes)
+ if (s.st_size < bytes)
{
sim_io_error (sd,
"Error, cannot confirm that mmap file is large enough "
@@ -383,10 +398,15 @@ memory_option_handler (SIM_DESC sd, sim_cpu *cpu, int opt,
chp = parse_addr (chp, &level, &space, &addr);
if (*chp != ',')
{
- sim_io_eprintf (sd, "Missing size for memory-region\n");
- return SIM_RC_FAIL;
+ /* let the file autosize */
+ if (mmap_next_fd == -1)
+ {
+ sim_io_eprintf (sd, "Missing size for memory-region\n");
+ return SIM_RC_FAIL;
+ }
}
- chp = parse_size (chp + 1, &nr_bytes, &modulo);
+ else
+ chp = parse_size (chp + 1, &nr_bytes, &modulo);
/* old style */
if (*chp == ',')
modulo = strtoul (chp + 1, &chp, 0);