7a2e863f9d
Alpha has never set AT_HWCAP in linux-user emulation, so getauxval(AT_HWCAP) always returned 0 regardless of the emulated CPU model. The Linux kernel computes ELF_HWCAP as ~amask(-1), i.e. the set of ISA extension bits that the amask instruction reports as supported (cleared in its output). env->amask stores exactly those bits with the same layout (BWX=0x1, FIX=0x2, CIX=0x4, MVI=0x100, TRAP=0x200, PREFETCH=0x1000), so returning it directly from get_elf_hwcap matches the kernel convention. Add HAVE_ELF_HWCAP to target_elf.h and implement get_elf_hwcap() in elfload.c to expose the emulated CPU's capability mask to user-space programs via the auxiliary vector. Without this fix, programs using getauxval(AT_HWCAP) to detect BWX/FIX/CIX (such as glibc's memcpy or JIT compilers targeting Alpha) incorrectly concluded that no extensions were available even when emulating ev56+. Signed-off-by: Matt Turner <mattst88@gmail.com> Cc: qemu-stable@nongnu.org Reviewed-by: Helge Deller <deller@gmx.de> Signed-off-by: Helge Deller <deller@gmx.de>
29 lines
933 B
C
29 lines
933 B
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation, or (at your option) any
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* later version. See the COPYING file in the top-level directory.
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*/
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#ifndef ALPHA_TARGET_ELF_H
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#define ALPHA_TARGET_ELF_H
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#define ELF_CLASS ELFCLASS64
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#define ELF_MACHINE EM_ALPHA
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#define HAVE_ELF_CORE_DUMP 1
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#define HAVE_ELF_HWCAP 1
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/*
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* Matches the kernel's elf_gregset_t (ELF_NGREG = 33):
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* r0-r30 at indices 0-30, pc at 31, ps at 32.
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* r31 (hardwired zero) is not stored; pc occupies index 31.
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*/
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typedef struct target_elf_gregset_t {
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abi_ulong regs[31]; /* integer registers r0-r30 [0..30] */
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abi_ulong pc; /* program counter [31] */
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abi_ulong unique; /* thread's UNIQUE field [32] */
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} target_elf_gregset_t;
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#endif
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