Re: git: 3a60869237b8 - main - Add assembly optimized code for OpenSSL on powerpc, powerpc64 and powerpc64le
- Reply: Leandro Lupori : "Re: git: 3a60869237b8 - main - Add assembly optimized code for OpenSSL on powerpc, powerpc64 and powerpc64le"
- In reply to: John Baldwin : "Re: git: 3a60869237b8 - main - Add assembly optimized code for OpenSSL on powerpc, powerpc64 and powerpc64le"
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Date: Wed, 24 Nov 2021 21:52:23 UTC
On 21-11-24 10:34:36, John Baldwin wrote: > On 11/24/21 10:24 AM, Piotr Kubaj wrote: > > OK, it looks like ossl uses fpu_kern functions and those are available only an aarch64, amd64 and i386: > > cc -O2 -pipe -fno-common -fno-strict-aliasing -Werror -D_KERNEL -DKLD_MODULE -nostdinc -include /usr/obj/usr/src/powerpc.powerpc64/sys/modules/ossl/opt_global.h -I. -I/usr/src/sys -I/usr/src/sys/contrib/ck/include -fno-common -fPIC -mlongcall -fno-omit-frame-pointer -fdebug-prefix-map=./machine=/usr/src/sys/powerpc/include -MD -MF.depend.ossl.o -MTossl.o -mno-altivec -msoft-float -mabi=elfv2 -ffreestanding -fwrapv -fstack-protector -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wcast-qual -Wundef -Wno-pointer-sign -D__printf__=__freebsd_kprintf__ -Wmissing-include-dirs -fdiagnostics-show-option -Wno-unknown-pragmas -Wno-error-tautological-compare -Wno-error-empty-body -Wno-error-parentheses-equality -Wno-error-unused-function -Wno-error-pointer-sign -Wno-error-shift-negative-value -Wno-address-of-packed-member -Wno-format-zero-length -std=iso9899:1999 -c /usr/src/sys/crypto/openssl/ossl.c -o ossl.o > > /usr/src/sys/crypto/openssl/ossl.c:190:4: error: implicit declaration of function 'fpu_kern_enter' is invalid in C99 [-Werror,-Wimplicit-function-declaration] > > fpu_kern_enter(curthread, NULL, FPU_KERN_NOCTX); > > ^ > > /usr/src/sys/crypto/openssl/ossl.c:190:36: error: use of undeclared identifier 'FPU_KERN_NOCTX' > > fpu_kern_enter(curthread, NULL, FPU_KERN_NOCTX); > > ^ > > /usr/src/sys/crypto/openssl/ossl.c:193:4: error: implicit declaration of function 'fpu_kern_leave' is invalid in C99 [-Werror,-Wimplicit-function-declaration] > > fpu_kern_leave(curthread, NULL); > > ^ > > /usr/src/sys/crypto/openssl/ossl.c:193:4: note: did you mean 'fpu_kern_enter'? > > /usr/src/sys/crypto/openssl/ossl.c:190:4: note: 'fpu_kern_enter' declared here > > fpu_kern_enter(curthread, NULL, FPU_KERN_NOCTX); > > ^ > > /usr/src/sys/crypto/openssl/ossl.c:214:6: error: implicit declaration of function 'is_fpu_kern_thread' is invalid in C99 [-Werror,-Wimplicit-function-declaration] > > if (is_fpu_kern_thread(0)) { > > ^ > > /usr/src/sys/crypto/openssl/ossl.c:217:3: error: implicit declaration of function 'fpu_kern_enter' is invalid in C99 [-Werror,-Wimplicit-function-declaration] > > fpu_kern_enter(curthread, NULL, FPU_KERN_NOCTX); > > ^ > > /usr/src/sys/crypto/openssl/ossl.c:217:35: error: use of undeclared identifier 'FPU_KERN_NOCTX' > > fpu_kern_enter(curthread, NULL, FPU_KERN_NOCTX); > > ^ > > /usr/src/sys/crypto/openssl/ossl.c:263:3: error: implicit declaration of function 'fpu_kern_leave' is invalid in C99 [-Werror,-Wimplicit-function-declaration] > > fpu_kern_leave(curthread, NULL); > > ^ > > 7 errors generated. > > > > AFAIK porting those is not easy and it's certainly above my pay grade. > > Do the powerpc instructions use additional registers that are not part of the normal > GPRs saved/restored on a context switch? If so, then, yes, you will need to implement > something here (though the FPU_KERN_NOCTX variant is a bit simpler as it disables > context switches and it's sufficient just to init the registers and permit accesses > without raising a trap until fpu_kern_leave). If not, then you can make the use of > those functions conditional on architecture. I guess bdragon, jhibbits, luporl or adalava would be better source of information. That said, after looking at https://community.nxp.com/t5/MPC5xxx/Example-code-for-context-switch-for-MPC56XX-PowerPC/m-p/732248/highlight/true, it seems like indeed registers other than GPRs are saved and restored. I tried looking at https://cgit.freebsd.org/src/diff/?id=6ed982a221e024d64dd0ab776e6197643fa1530e. fpu_kern_enter() and fpu_kern_leave() are quite scary :) > > > On 21-11-24 08:15:26, John Baldwin wrote: > >> On 11/23/21 2:27 PM, Piotr Kubaj wrote: > >>> The branch main has been updated by pkubaj (ports committer): > >>> > >>> URL: https://cgit.FreeBSD.org/src/commit/?id=3a60869237b8b315fe66497cf5299ec08b688533 > >>> > >>> commit 3a60869237b8b315fe66497cf5299ec08b688533 > >>> Author: Piotr Kubaj <pkubaj@FreeBSD.org> > >>> AuthorDate: 2021-11-22 02:28:46 +0000 > >>> Commit: Piotr Kubaj <pkubaj@FreeBSD.org> > >>> CommitDate: 2021-11-23 22:26:53 +0000 > >>> > >>> Add assembly optimized code for OpenSSL on powerpc, powerpc64 and powerpc64le > >>> > >>> Summary: > >>> 1. https://github.com/openssl/openssl/commit/34ab13b7d8e3e723adb60be8142e38b7c9cd382a > >>> needs to be merged for ELFv2 support on big-endian. > >>> 2. crypto/openssl/crypto/ppccap.c needs to be patched. > >>> Same reason as in https://github.com/openssl/openssl/pull/17082. > >> > >> Have you looked at adding powerpc support to ossl(4)? It should be fairly simple > >> (just adding the right asm files in Makefiles and the powerpc equivalent of > >> OSSL_cpuid). > >> > >> -- > >> John Baldwin > > > -- > John Baldwin --