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
This commit is contained in:
Edward Tomasz Napierala 2021-06-01 13:12:25 +01:00
parent ec7b47fc81
commit b501b2ae52

View File

@ -57,6 +57,8 @@ __FBSDID("$FreeBSD$");
#include <compat/linux/linux_util.h>
#include <compat/linux/linux_vdso.h>
#include <machine/md_var.h>
#ifdef VFP
#include <machine/vfp.h>
#endif
@ -169,9 +171,7 @@ linux_copyout_auxargs(struct image_params *imgp, uintptr_t base)
issetugid = p->p_flag & P_SUGID ? 1 : 0;
AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR,
imgp->proc->p_sysent->sv_shared_page_base);
#if 0 /* LINUXTODO: implement arm64 LINUX_AT_HWCAP */
AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature);
#endif
AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, *imgp->sysent->sv_hwcap);
AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz);
AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
@ -186,6 +186,7 @@ linux_copyout_auxargs(struct image_params *imgp, uintptr_t base)
AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid);
AUXARGS_ENTRY_PTR(pos, LINUX_AT_RANDOM, imgp->canary);
AUXARGS_ENTRY(pos, LINUX_AT_HWCAP2, *imgp->sysent->sv_hwcap2);
if (imgp->execpathp != 0)
AUXARGS_ENTRY_PTR(pos, LINUX_AT_EXECFN, imgp->execpathp);
if (args->execfd != -1)
@ -437,6 +438,8 @@ struct sysentvec elf_linux_sysvec = {
.sv_schedtail = linux_schedtail,
.sv_thread_detach = linux_thread_detach,
.sv_trap = linux_vsyscall,
.sv_hwcap = &elf_hwcap,
.sv_hwcap2 = &elf_hwcap2,
.sv_onexec = linux_on_exec,
.sv_onexit = linux_on_exit,
.sv_ontdexit = linux_thread_dtor,