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userspace: get rid of app section placeholders

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We used to leave byte-long placeholder symbols to ensure
that empty application memory sections did not cause
build errors that were very difficult to understand.

Now we use some relatively portable inline assembly to
generate a symbol, but don't take up any extra space.

The malloc and libc partitions are now only instantiated
if there is some data to put in them.

Fixes: #13923

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2019-02-27 20:12:40 -08:00 • committed by Andrew Boie
commit 7707060959
5 changed files with 53 additions and 8 deletions
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11
include/misc/libc-hooks.h
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@ -37,12 +37,23 @@ __syscall size_t _zephyr_fwrite(const void *_MLIBC_RESTRICT ptr, size_t size,
#endif /* CONFIG_NEWLIB_LIBC */
#ifdef CONFIG_USERSPACE
#if defined(CONFIG_NEWLIB_LIBC) || (CONFIG_MINIMAL_LIBC_MALLOC_ARENA_SIZE > 0)
#define Z_MALLOC_PARTITION_EXISTS 1
/* Memory partition containing the libc malloc arena */
extern struct k_mem_partition z_malloc_partition;
#endif
#if defined(CONFIG_NEWLIB_LIBC) || defined(CONFIG_STACK_CANARIES)
/* Minimal libc has no globals. We do put the stack canary global in the
* libc partition since it is not worth placing in a partition of its own.
*/
#define Z_LIBC_PARTITION_EXISTS 1
/* C library globals, except the malloc arena */
extern struct k_mem_partition z_libc_partition;
#endif
#endif /* CONFIG_USERSPACE */
#include <syscalls/libc-hooks.h>