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libexec: mmap support, prealloc variants

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In libexec, split the memory allocation method into cleared and
non-cleared. Cleared gives zeroed memory, non-cleared gives 'junk'
memory (that will be overwritten anyway, and so needn't be cleared)
that is faster to get.

Also introduce the 'memmap' method that can be used, if available,
to map code and data from executables into a process using the
third-party mmap() mode.

Change-Id: I26694fd3c21deb8b97e01ed675dfc14719b0672b
This commit is contained in:
Ben Gras
2013-04-24 10:18:16 +00:00
parent 6fa5ce74ce
commit 0cfff08e56
8 changed files with 129 additions and 32 deletions
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lib/libexec/exec_general.c
+12 -1
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@@ -18,7 +18,7 @@
#include <sys/mman.h>
#include <machine/elf.h>
int libexec_alloc_mmap_prealloc(struct exec_info *execi, off_t vaddr, size_t len)
int libexec_alloc_mmap_prealloc_junk(struct exec_info *execi, off_t vaddr, size_t len)
{
if(minix_mmap_for(execi->proc_e, (void *) vaddr, len,
PROT_READ|PROT_WRITE|PROT_EXEC,
@@ -29,6 +29,17 @@ int libexec_alloc_mmap_prealloc(struct exec_info *execi, off_t vaddr, size_t len
return OK;
}
int libexec_alloc_mmap_prealloc_cleared(struct exec_info *execi, off_t vaddr, size_t len)
{
if(minix_mmap_for(execi->proc_e, (void *) vaddr, len,
PROT_READ|PROT_WRITE|PROT_EXEC,
MAP_ANON|MAP_PREALLOC|MAP_FIXED, -1, 0) == MAP_FAILED) {
return ENOMEM;
}
return OK;
}
int libexec_alloc_mmap_ondemand(struct exec_info *execi, off_t vaddr, size_t len)
{
if(minix_mmap_for(execi->proc_e, (void *) vaddr, len,