diff options
| author | Hans-Peter Nilsson <hp@axis.com> | 2012-10-21 03:41:42 +0000 |
|---|---|---|
| committer | Hans-Peter Nilsson <hp@axis.com> | 2012-10-21 03:41:42 +0000 |
| commit | 1ad660ece1c5ce9d76beb7a9756c6d111c452e81 (patch) | |
| tree | 50bd0e991af970e6df6aac46cf5f8465e7ec1891 /newlib | |
| parent | 821d6519174d700c99184db0485fde8b53419a18 (diff) | |
| download | cygnal-1ad660ece1c5ce9d76beb7a9756c6d111c452e81.tar.gz cygnal-1ad660ece1c5ce9d76beb7a9756c6d111c452e81.tar.bz2 cygnal-1ad660ece1c5ce9d76beb7a9756c6d111c452e81.zip | |
* libc/sys/mmixware/sbrk.c (_sbrk): Drop unused extern declaration
of "end". Mark allocated memory by applying PRELD.
Diffstat (limited to 'newlib')
| -rw-r--r-- | newlib/ChangeLog | 5 | ||||
| -rw-r--r-- | newlib/libc/sys/mmixware/sbrk.c | 20 |
2 files changed, 23 insertions, 2 deletions
diff --git a/newlib/ChangeLog b/newlib/ChangeLog index ce3a390e9..e89ae0dc6 100644 --- a/newlib/ChangeLog +++ b/newlib/ChangeLog @@ -1,3 +1,8 @@ +2012-10-21 Hans-Peter Nilsson <hp@bitrange.com> + + * libc/sys/mmixware/sbrk.c (_sbrk): Drop unused extern declaration + of "end". Mark allocated memory by applying PRELD. + 2012-10-16 Gregory Pietsch <gpietsch@comcast.net> * libc/stdlib/getopt.c (getopt_internal): Align handling of colon to diff --git a/newlib/libc/sys/mmixware/sbrk.c b/newlib/libc/sys/mmixware/sbrk.c index de5ce5dac..f50886df8 100644 --- a/newlib/libc/sys/mmixware/sbrk.c +++ b/newlib/libc/sys/mmixware/sbrk.c @@ -1,6 +1,6 @@ /* sbrk for MMIXware. - Copyright (C) 2001 Hans-Peter Nilsson + Copyright (C) 2001, 2012 Hans-Peter Nilsson Permission to use, copy, modify, and distribute this software is freely granted, provided that the above copyright notice, this notice @@ -34,10 +34,26 @@ __asm__ (" .global _Sbrk_high\n" caddr_t _sbrk (size_t incr) { - extern char end; /* Defined by the linker */ char *prev_heap_end; prev_heap_end = _Sbrk_high; + + /* A simulator that requires explicit memory allocation is expected + to hook that to the PRELD data prefetch insn, which is otherwise + typically a nop. */ + if ((long) incr > 0) + { + size_t n = incr; + char *p = prev_heap_end; +#define A(N) __asm__ ("preld " #N ",%0,0" : : "r" (p)) +#define PRELDOWNTO(N) while (n >= N + 1) { A(N); n -= N + 1; p += N + 1; } + + PRELDOWNTO (255); + PRELDOWNTO (31); + PRELDOWNTO (3); + PRELDOWNTO (0); + } + _Sbrk_high += incr; return (caddr_t) prev_heap_end; } |