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powerpc: Provide a suitable AT_PLATFORM value

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The glibc folks want to use AT_PLATFORM to select between possible
alternative versions of shared libraries.  This commit makes the kernel
supply an AT_PLATFORM string that indicates what class of processor
we are running on.  Processors with the same set of user-level
instructions and roughly the same instruction scheduling characteristics
are given the same AT_PLATFORM value; for example, 821, 823 and 860
are all reported as "ppc823", and 7447, 7447A, 7448, 7450, 7451, 7455
are all called "ppc7450".

The intention is that the AT_PLATFORM values match the values that
gcc accepts for the -mcpu= option.  For values which are numeric
(e.g. -mcpu=750), "ppc" has been prepended.

This also adds a PPC_FEATURE_BOOKE bit to the AT_HWCAP value and sets
it for the 440 family and the Freescale 85xx family.

Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Paul Mackerras
2006-01-14 10:11:39 +11:00
parent 25cd6aa0aa
commit 80f15dc703
3 changed files with 139 additions and 53 deletions
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16
include/asm-powerpc/elf.h
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@@ -221,21 +221,19 @@ extern int dump_task_fpu(struct task_struct *, elf_fpregset_t *);
instruction set this cpu supports. This could be done in userspace,
but it's not easy, and we've already done it here. */
# define ELF_HWCAP (cur_cpu_spec->cpu_user_features)
/* This yields a string that ld.so will use to load implementation
specific libraries for optimization. This is more specific in
intent than poking at uname or /proc/cpuinfo. */
#define ELF_PLATFORM (cur_cpu_spec->platform)
#ifdef __powerpc64__
# define ELF_PLAT_INIT(_r, load_addr) do { \
_r->gpr[2] = load_addr; \
} while (0)
#endif /* __powerpc64__ */
/* This yields a string that ld.so will use to load implementation
specific libraries for optimization. This is more specific in
intent than poking at uname or /proc/cpuinfo.
For the moment, we have only optimizations for the Intel generations,
but that could change... */
#define ELF_PLATFORM (NULL)
#ifdef __KERNEL__
#ifdef __powerpc64__