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target-ppc: Extend HWCAP2 bits for ISA 3.0 

This adds the HWCAP2 bit to detect if a linux user process is
running on an ISA 3.0 compliant cpu like POWER9. This can be
verified using a simple test program that prints the value in
the auxiliary vector for AT_HWCAP2 as shown below.

Before:
  $ qemu-ppc64le -cpu power8 test
  0x8c000000

  $ qemu-ppc64le -cpu power9 test
  0x8c000000

After:
  $ qemu-ppc64le -cpu power8 test
  0x8c000000

  $ qemu-ppc64le -cpu power9 test
  0x8c800000

Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Sandipan Das 2018-09-06 12:27:29 +05:30 committed by David Gibson
parent a84f71793a
commit be0c46d464
1 changed files with 2 additions and 0 deletions
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2
linux-user/elfload.c
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@ -710,6 +710,7 @@ enum {
QEMU_PPC_FEATURE2_HAS_EBB = 0x10000000, /* Event Base Branching */
QEMU_PPC_FEATURE2_HAS_ISEL = 0x08000000, /* Integer Select */
QEMU_PPC_FEATURE2_HAS_TAR = 0x04000000, /* Target Address Register */
QEMU_PPC_FEATURE2_ARCH_3_00 = 0x00800000, /* ISA 3.00 */
};
#define ELF_HWCAP get_elf_hwcap()
@ -764,6 +765,7 @@ static uint32_t get_elf_hwcap2(void)
GET_FEATURE2(PPC2_BCTAR_ISA207, QEMU_PPC_FEATURE2_HAS_TAR);
GET_FEATURE2((PPC2_BCTAR_ISA207 | PPC2_LSQ_ISA207 | PPC2_ALTIVEC_207 |
PPC2_ISA207S), QEMU_PPC_FEATURE2_ARCH_2_07);
GET_FEATURE2(PPC2_ISA300, QEMU_PPC_FEATURE2_ARCH_3_00);
#undef GET_FEATURE
#undef GET_FEATURE2