linux: export AT_HWCAP and AT_HWCAP2 on aarch64
The flag values seem to be the same between Linux and FreeBSD. Comparing to a Linux VM on the same hardware, we're missing HWCAP_EVTSTRM, HWCAP_CPUID, HWCAP_DCPOP, HWCAP_USCAT, HWCAP_PACA, and HWCAP_PACG. Reviewed By: mhorne, emaste Sponsored By: EPSRC Differential Revision: https://reviews.freebsd.org/D30540
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@ -57,6 +57,8 @@ __FBSDID("$FreeBSD$");
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#include <compat/linux/linux_util.h>
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#include <compat/linux/linux_vdso.h>
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#include <machine/md_var.h>
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#ifdef VFP
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#include <machine/vfp.h>
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#endif
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@ -169,9 +171,7 @@ linux_copyout_auxargs(struct image_params *imgp, uintptr_t base)
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issetugid = p->p_flag & P_SUGID ? 1 : 0;
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AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR,
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imgp->proc->p_sysent->sv_shared_page_base);
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#if 0 /* LINUXTODO: implement arm64 LINUX_AT_HWCAP */
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AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature);
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#endif
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AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, *imgp->sysent->sv_hwcap);
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AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
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AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz);
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AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
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@ -186,6 +186,7 @@ linux_copyout_auxargs(struct image_params *imgp, uintptr_t base)
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AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
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AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid);
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AUXARGS_ENTRY_PTR(pos, LINUX_AT_RANDOM, imgp->canary);
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AUXARGS_ENTRY(pos, LINUX_AT_HWCAP2, *imgp->sysent->sv_hwcap2);
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if (imgp->execpathp != 0)
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AUXARGS_ENTRY_PTR(pos, LINUX_AT_EXECFN, imgp->execpathp);
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if (args->execfd != -1)
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@ -437,6 +438,8 @@ struct sysentvec elf_linux_sysvec = {
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.sv_schedtail = linux_schedtail,
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.sv_thread_detach = linux_thread_detach,
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.sv_trap = linux_vsyscall,
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.sv_hwcap = &elf_hwcap,
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.sv_hwcap2 = &elf_hwcap2,
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.sv_onexec = linux_on_exec,
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.sv_onexit = linux_on_exit,
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.sv_ontdexit = linux_thread_dtor,
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