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[PW_SID:1028982] lib/crypto: riscv/chacha: Maintain a frame pointer #1165

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[PW_SID:1028982] lib/crypto: riscv/chacha: Maintain a frame pointer #1165

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13 changes: 8 additions & 5 deletions lib/crypto/riscv/chacha-riscv64-zvkb.S
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Original file line number Diff line number Diff line change
Expand Up @@ -60,7 +60,7 @@
#define VL t2
#define STRIDE t3
#define ROUND_CTR t4
#define KEY0 s0
#define KEY0 t5
#define KEY1 s1
#define KEY2 s2
#define KEY3 s3
Expand Down Expand Up @@ -142,8 +142,7 @@
// the original Salsa20 paper which uses a 64-bit counter in state->x[12..13].
// The updated 32-bit counter is written back to state->x[12] before returning.
SYM_FUNC_START(chacha_zvkb)
addi sp, sp, -96
sd s0, 0(sp)
addi sp, sp, -112
sd s1, 8(sp)
sd s2, 16(sp)
sd s3, 24(sp)
Expand All @@ -155,6 +154,10 @@ SYM_FUNC_START(chacha_zvkb)
sd s9, 72(sp)
sd s10, 80(sp)
sd s11, 88(sp)
sd fp, 96(sp)
sd ra, 104(sp)

addi fp, sp, 112

li STRIDE, 64

Expand Down Expand Up @@ -280,7 +283,6 @@ SYM_FUNC_START(chacha_zvkb)
bnez NBLOCKS, .Lblock_loop

sw COUNTER, 48(STATEP)
ld s0, 0(sp)
ld s1, 8(sp)
ld s2, 16(sp)
ld s3, 24(sp)
Expand All @@ -292,6 +294,7 @@ SYM_FUNC_START(chacha_zvkb)
ld s9, 72(sp)
ld s10, 80(sp)
ld s11, 88(sp)
addi sp, sp, 96
ld fp, 96(sp)
addi sp, sp, 112
ret
SYM_FUNC_END(chacha_zvkb)