Le 30/08/2024 à 18:17, Jason A. Donenfeld a écrit :
On Fri, Aug 30, 2024 at 05:57:08PM +0200, Christophe Leroy wrote:
@@ -14,6 +14,10 @@ ifeq ($(uname_M),x86_64)
TEST_GEN_PROGS += vdso_test_getrandom
TEST_GEN_PROGS += vdso_test_chacha
endif
+ifeq ($(ARCH),powerpc)
+TEST_GEN_PROGS += vds
Le 30/08/2024 à 18:42, Christophe Leroy a écrit :
Le 30/08/2024 à 18:14, Jason A. Donenfeld a écrit :
On Fri, Aug 30, 2024 at 05:57:08PM +0200, Christophe Leroy wrote:
+ * r5: 8-byte counter input/output (saved on stack)
+ *
+ * r14-r15: counter
+ */
+SYM_FUNC_START(__arch_chacha20_b
Le 30/08/2024 à 18:14, Jason A. Donenfeld a écrit :
On Fri, Aug 30, 2024 at 05:57:08PM +0200, Christophe Leroy wrote:
+ * r5: 8-byte counter input/output (saved on stack)
+ *
+ * r14-r15: counter
+ */
+SYM_FUNC_START(__arch_chacha20_blocks_nostack)
+ stwur1, -96(r1)
+
On Fri, Aug 30, 2024 at 05:57:08PM +0200, Christophe Leroy wrote:
> @@ -14,6 +14,10 @@ ifeq ($(uname_M),x86_64)
> TEST_GEN_PROGS += vdso_test_getrandom
> TEST_GEN_PROGS += vdso_test_chacha
> endif
> +ifeq ($(ARCH),powerpc)
> +TEST_GEN_PROGS += vdso_test_getrandom
> +TEST_GEN_PROGS += vdso_test_c
On Fri, Aug 30, 2024 at 05:57:08PM +0200, Christophe Leroy wrote:
> + * r5: 8-byte counter input/output (saved on stack)
> + *
> + * r14-r15: counter
> + */
> +SYM_FUNC_START(__arch_chacha20_blocks_nostack)
> + stwur1, -96(r1)
> + stw r5, 20(r1)
> + stmwr14, 24(r1)
> +
To be consistent with other VDSO functions, the function is called
__kernel_getrandom()
__arch_chacha20_blocks_nostack() fonction is implemented basically
with 32 bits operations. It performs 4 QUARTERROUND operations in
parallele. There are enough registers to avoid using the stack:
On input:
