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Use ELF_BASE_PLATFORM to pass ISA level

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Some userland application/program runtime/dynamic loaded need to
know about the current ISA level to use the best runtime.
While kernel doesn't provides this info.

ELF_PLATFORM only provides some info about the CPU, with very few info,
for example, the value is "mips" for both 24Kc and P6600.

Currently ELF_BASE_PLATFORM is not used by MIPS (only by powerpc).
So we cant set its value as:
  mips2, mips3, mips4, mips5,
  mips32, mips32r2, mips32r6
  mips64, mips64r2, mips64r6
Then in userland, we can get it by:
  getauxval(AT_BASE_PLATFORM)

The only problem is that it seems has different defination than ppc:
  on ppc, it is the mircoarchitecture
while now we use it as ISA level on MIPS.

Signed-off-by: YunQiang Su <syq@debian.org>
Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
YunQiang Su
2020-03-07 10:39:45 +08:00
committed by Thomas Bogendoerfer
parent be28076433
commit e585b768da
2 changed files with 21 additions and 0 deletions
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3
arch/mips/include/asm/elf.h
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@@ -445,6 +445,9 @@ extern unsigned int elf_hwcap;
#define ELF_PLATFORM __elf_platform
extern const char *__elf_platform;
#define ELF_BASE_PLATFORM __elf_base_platform
extern const char *__elf_base_platform;
/*
* See comments in asm-alpha/elf.h, this is the same thing
* on the MIPS.