* sparc/aes.asm: The frame setup was broken. Tried to fix it.

Rev: src/nettle/sparc/aes.asm:1.75

diff --git a/sparc/aes.asm b/sparc/aes.asm
index 34592ff56fe5b059fd33e6543b12e8c2e04c2ad2..79a5d37fde36d13cbefd4a647d11c575b5c62ece 100644 (file)
--- a/sparc/aes.asm
+++ b/sparc/aes.asm
@@ -42,7 +42,9 @@ define(dst, %i3)
 define(src, %i4)
 
 ! Loop invariants
-define(wtxt, %sp)
+! NOTE: We overwrite %fp with the wtxt pointer,
+!       so it must be restored at the end of the function.
+define(wtxt, %fp)
 define(tmp, %l1)
 define(diff, %l2)
 define(nrounds, %l3)
@@ -66,29 +68,36 @@ define(t1, %o1)
 define(t2, %o2)
 define(t3, %o3)
 
-define(<FRAME_SIZE>, 32)
-define(<FRAME_WTXT>, 0)
-define(<FRAME_TMP>, 16)
+C The stack frame looks like
+C
+C %fp -   4: OS-dependent link field
+C %fp -   8: OS-dependent link field
+C %fp -  24: tmp, uint32_t[4]
+C %fp -  40: wtxt, uint32_t[4]
+C %fp - 136: OS register save area. 
+define(<FRAME_SIZE>, 136)
 
 _aes_crypt:
        save    %sp, -FRAME_SIZE, %sp
        cmp     length, 0
        be      .Lend
-       add     %sp, FRAME_TMP, tmp
+       add     %fp, -24, tmp
 
+       C NOTE: Over writes %fp
+       add     %fp, -40, wtxt
        ld      [ctx + AES_NROUNDS], nrounds
        ! Compute xor, so that we can swap efficiently.
        xor     wtxt, tmp, diff
        ! The loop variable will be multiplied by 16.
        ! More loop invariants
        add     T, AES_TABLE0, T0
-       add     T, AES_TABLE1, T1
        
+       add     T, AES_TABLE1, T1
        add     T, AES_TABLE2, T2
        add     T, AES_TABLE3, T3
        add     T, AES_SIDX1, IDX1
-       add     T, AES_SIDX3, IDX3
        
+       add     T, AES_SIDX3, IDX3
        ! Read src, and add initial subkey
        ! Difference between ctx and src.
        ! NOTE: These instructions are duplicated in the delay slot,
@@ -100,7 +109,6 @@ _aes_crypt:
        ! For stop condition. Note that src is incremented in the
        ! delay slot
        add     src, 8, %g1
-       nop
                
 .Lsource_loop:
        ldub    [src+3], t3
@@ -238,6 +246,7 @@ define(i, round)
        bne     .Lblock_loop
        sub     wtxt, src, %g3
 
+       add     %sp, FRAME_SIZE, %fp
 .Lend:
        ret
        restore