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-rw-r--r--src/hash/sha1_amd64/sha1_amd64_imp.S10
1 files changed, 8 insertions, 2 deletions
diff --git a/src/hash/sha1_amd64/sha1_amd64_imp.S b/src/hash/sha1_amd64/sha1_amd64_imp.S
index 34a8318ed..ba4d4d5ef 100644
--- a/src/hash/sha1_amd64/sha1_amd64_imp.S
+++ b/src/hash/sha1_amd64/sha1_amd64_imp.S
@@ -103,10 +103,16 @@ ALIGN;
subq $320, W
+/*
+* Using negative values for SHA-1 constants > 2^31 to work around
+* a bug in binutils not accepting large lea displacements.
+* -0x70E44324 == 0x8F1BBCDC
+* -0x359D3E2A == 0xCA62C1D6
+*/
#define MAGIC1 0x5A827999
#define MAGIC2 0x6ED9EBA1
-#define MAGIC3 0x8F1BBCDC
-#define MAGIC4 0xCA62C1D6
+#define MAGIC3 -0x70E44324
+#define MAGIC4 -0x359D3E2A
#define T %esi
#define T2 %eax