diff options
Diffstat (limited to 'thirdparty/mbedtls/patches/pr4948-fix-clang12-opt.patch')
| -rw-r--r-- | thirdparty/mbedtls/patches/pr4948-fix-clang12-opt.patch | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/thirdparty/mbedtls/patches/pr4948-fix-clang12-opt.patch b/thirdparty/mbedtls/patches/pr4948-fix-clang12-opt.patch new file mode 100644 index 0000000000..84c205a80f --- /dev/null +++ b/thirdparty/mbedtls/patches/pr4948-fix-clang12-opt.patch @@ -0,0 +1,36 @@ +From 7c847235e8f0e0b877c505f19733b417bb65ff2e Mon Sep 17 00:00:00 2001 +From: Gilles Peskine <Gilles.Peskine@arm.com> +Date: Tue, 14 Sep 2021 00:13:05 +0200 +Subject: [PATCH] x86_64 MULADDC assembly: add missing constraints about memory + +MULADDC_CORE reads from (%%rsi) and writes to (%%rdi). This fragment is +repeated up to 16 times, and %%rsi and %%rdi are s and d on entry +respectively. Hence the complete asm statement reads 16 64-bit words +from memory starting at s, and writes 16 64-bit words starting at d. + +Without any declaration of modified memory, Clang 12 and Clang 13 generated +non-working code for mbedtls_mpi_mod_exp. The constraints make the unit +tests pass with Clang 12. + +Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com> +--- + include/mbedtls/bn_mul.h | 6 +++--- + 1 file changed, 3 insertions(+), 3 deletions(-) + +diff --git a/include/mbedtls/bn_mul.h b/include/mbedtls/bn_mul.h +index 6f1201bf50a..f84f9650ddc 100644 +--- a/include/mbedtls/bn_mul.h ++++ b/include/mbedtls/bn_mul.h +@@ -256,9 +256,9 @@ + "addq $8, %%rdi\n" + + #define MULADDC_STOP \ +- : "+c" (c), "+D" (d), "+S" (s) \ +- : "b" (b) \ +- : "rax", "rdx", "r8" \ ++ : "+c" (c), "+D" (d), "+S" (s), "+m" (*(uint64_t (*)[16]) d) \ ++ : "b" (b), "m" (*(const uint64_t (*)[16]) s) \ ++ : "rax", "rdx", "r8" \ + ); + + #endif /* AMD64 */ |