diff options
Diffstat (limited to 'powerpc64/p7/chacha-4core.asm')
| -rw-r--r-- | powerpc64/p7/chacha-4core.asm | 21 |
1 files changed, 11 insertions, 10 deletions
diff --git a/powerpc64/p7/chacha-4core.asm b/powerpc64/p7/chacha-4core.asm index 0cd5c877..b2330247 100644 --- a/powerpc64/p7/chacha-4core.asm +++ b/powerpc64/p7/chacha-4core.asm @@ -132,11 +132,13 @@ PROLOGUE(_nettle_chacha_4core) li r7, 0x20 C ...useful... li r8, 0x30 C ...offsets - addi SP, SP, -0x40 C Save callee-save registers - stvx v20, 0, SP - stvx v21, r6, SP - stvx v22, r7, SP - stvx v23, r8, SP + C Save callee-save registers. Use the "protected zone", max + C 228 bytes, below the stack pointer, accessed via r10. + addi r10, SP, -0x40 + stvx v20, 0, r10 + stvx v21, r6, r10 + stvx v22, r7, r10 + stvx v23, r8, r10 vspltisw ROT16, -16 C -16 instead of 16 actually works! vspltisw ROT12, 12 @@ -257,11 +259,10 @@ IF_BE(` stxvw4x VSR(v15), r8, DST C Restore callee-save registers - lvx v20, 0, SP - lvx v21, r6, SP - lvx v22, r7, SP - lvx v23, r8, SP - addi SP, SP, 0x40 + lvx v20, 0, r10 + lvx v21, r6, r10 + lvx v22, r7, r10 + lvx v23, r8, r10 blr EPILOGUE(_nettle_chacha_4core) |