diff options
Diffstat (limited to 'sim/sh/interp.c')
| -rw-r--r-- | sim/sh/interp.c | 40 |
1 files changed, 35 insertions, 5 deletions
diff --git a/sim/sh/interp.c b/sim/sh/interp.c index 107842b..235d6bb 100644 --- a/sim/sh/interp.c +++ b/sim/sh/interp.c @@ -24,6 +24,15 @@ #ifdef HAVE_UNISTD_H #include <unistd.h> #endif +#ifdef HAVE_MMAP +#include <sys/mman.h> +# ifndef MAP_FAILED +# define MAP_FAILED -1 +# endif +# if !defined (MAP_ANONYMOUS) && defined (MAP_ANON) +# define MAP_ANONYMOUS MAP_ANON +# endif +#endif #include "sysdep.h" #include "bfd.h" @@ -1715,6 +1724,27 @@ static void ppi_insn (); #include "ppi.c" +/* Provide calloc / free versions that use an anonymous mmap. This can + significantly cut the start-up time when a large simulator memory is + required, because pages are only zeroed on demand. */ +#ifdef MAP_ANONYMOUS +void * +mcalloc (size_t nmemb, size_t size) +{ + void *page; + + if (nmemb != 1) + size *= nmemb; + return mmap (0, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, + -1, 0); +} + +#define mfree(start,length) munmap ((start), (length)) +#else +#define mcalloc calloc +#define mfree(start,length) free(start) +#endif + /* Set the memory size to the power of two provided. */ void @@ -1722,17 +1752,17 @@ sim_size (power) int power; { - saved_state.asregs.msize = 1 << power; - sim_memory_size = power; if (saved_state.asregs.memory) { - free (saved_state.asregs.memory); + mfree (saved_state.asregs.memory, saved_state.asregs.msize); } + saved_state.asregs.msize = 1 << power; + saved_state.asregs.memory = - (unsigned char *) calloc (64, saved_state.asregs.msize / 64); + (unsigned char *) mcalloc (1, saved_state.asregs.msize); if (!saved_state.asregs.memory) { @@ -1741,7 +1771,7 @@ sim_size (power) saved_state.asregs.msize); saved_state.asregs.msize = 1; - saved_state.asregs.memory = (unsigned char *) calloc (1, 1); + saved_state.asregs.memory = (unsigned char *) mcalloc (1, 1); } } |