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Fix avr asm constraints.

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This commit is contained in:
Ken MacKay
2014-04-26 14:29:30 -07:00
parent 7d7a4c86d6
commit a4009bf6d5
1 changed files with 60 additions and 79 deletions
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asm_avr.inc
+60 -79
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@@ -96,10 +96,6 @@ static uint8_t vli_add(uint8_t *p_result, uint8_t *p_left, uint8_t *p_right)
uint8_t l_right;
__asm__ volatile (
"push r28 \n\t" /* Save Y */
"push r29 \n\t"
"movw r28, %A[rptr] \n\t" /* Copy p_right to Y */
"ld %[left], x+ \n\t" /* Load left byte. */
"ld %[right], y+ \n\t" /* Load right byte. */
"add %[left], %[right] \n\t" /* Add the first byte. */
@@ -113,12 +109,11 @@ static uint8_t vli_add(uint8_t *p_result, uint8_t *p_left, uint8_t *p_right)
"adc %[carry], %[carry] \n\t" /* Store carry bit in l_carry. */
"pop r29 \n\t" /* Restore Y */
"pop r28 \n\t"
"sbiw r28, " STR(uECC_BYTES) " \n\t" /* Restore Y */
: "+z" (p_result), "+x" (p_left),
[carry] "+r" (l_carry), [left] "=r" (l_left), [right] "=r" (l_right)
: [rptr] "r" (p_right)
[carry] "+r" (l_carry), [left] "=&r" (l_left), [right] "=&r" (l_right)
: "y" (p_right)
: "cc", "memory"
);
return l_carry;
@@ -133,10 +128,6 @@ static uint8_t vli_sub(uint8_t *p_result, uint8_t *p_left, uint8_t *p_right)
uint8_t l_right;
__asm__ volatile (
"push r28 \n\t" /* Save Y */
"push r29 \n\t"
"movw r28, %A[rptr] \n\t" /* Copy p_right to Y */
"ld %[left], x+ \n\t" /* Load left byte. */
"ld %[right], y+ \n\t" /* Load right byte. */
"sub %[left], %[right] \n\t" /* Subtract the first byte. */
@@ -150,12 +141,11 @@ static uint8_t vli_sub(uint8_t *p_result, uint8_t *p_left, uint8_t *p_right)
"adc %[borrow], %[borrow] \n\t" /* Store carry bit in l_borrow. */
"pop r29 \n\t" /* Restore Y */
"pop r28 \n\t"
"sbiw r28, " STR(uECC_BYTES) " \n\t" /* Restore Y */
: "+z" (p_result), "+x" (p_left),
[borrow] "+r" (l_borrow), [left] "=r" (l_left), [right] "=r" (l_right)
: [rptr] "r" (p_right)
[borrow] "+r" (l_borrow), [left] "=&r" (l_left), [right] "=&r" (l_right)
: "y" (p_right)
: "cc", "memory"
);
return l_borrow;
@@ -3250,21 +3240,21 @@ static void vli_square(uint8_t *p_result, uint8_t *p_left)
static void vli_modSub_fast(uint8_t *p_result, uint8_t *p_left, uint8_t *p_right)
{
uint8_t t1, t2;
__asm__ volatile (
"push r28 \n\t" /* Save Y */
"push r29 \n\t"
"movw r28, %A[rptr] \n\t" /* Copy p_right to Y */
"ld r18, x+ \n\t" /* Load left word. */
"ld r19, y+ \n\t" /* Load right word. */
"sub r18, r19 \n\t" /* Subtract the first word. */
"st z+, r18 \n\t" /* Store the first result word. */
"ld %[t1], x+ \n\t" /* Load left word. */
"ld %[t2], y+ \n\t" /* Load right word. */
"sub %[t1], %[t2] \n\t" /* Subtract the first word. */
"st z+, %[t1] \n\t" /* Store the first result word. */
/* Now we just do the remaining words with the carry bit (using SBC) */
REPEAT(DEC(uECC_BYTES), "ld r18, x+ \n\t"
"ld r19, y+ \n\t"
"sbc r18, r19 \n\t"
"st z+, r18 \n\t")
REPEAT(DEC(uECC_BYTES), "ld %[t1], x+ \n\t"
"ld %[t2], y+ \n\t"
"sbc %[t1], %[t2] \n\t"
"st z+, %[t1] \n\t")
"brcs 1f \n\t" /* If borrow is set, then we need to add */
"rjmp done \n\t" /* otherwise we are done */
@@ -3275,22 +3265,23 @@ static void vli_modSub_fast(uint8_t *p_result, uint8_t *p_left, uint8_t *p_right
"ldi r29, hi8(curve_p) \n\t"
/* do the addition */
"ld r18, z \n\t"
"ld r19, y+ \n\t"
"add r18, r19 \n\t"
"st z+, r18 \n\t"
REPEAT(DEC(uECC_BYTES), "ld r18, z \n\t"
"ld r19, y+ \n\t"
"adc r18, r19 \n\t"
"st z+, r18 \n\t")
"ld %[t1], z \n\t"
"ld %[t2], y+ \n\t"
"add %[t1], %[t2] \n\t"
"st z+, %[t1] \n\t"
REPEAT(DEC(uECC_BYTES), "ld %[t1], z \n\t"
"ld %[t2], y+ \n\t"
"adc %[t1], %[t2] \n\t"
"st z+, %[t1] \n\t")
"done: \n\t"
"pop r29 \n\t" /* Restore Y */
"pop r28 \n\t"
: "+z" (p_result), "+x" (p_left)
: [rptr] "r" (p_right)
: "r18", "r19", "cc", "memory"
: "+z" (p_result), "+x" (p_left),
[t1] "=&r" (t1), [t2] "=&r" (t2)
: "y" (p_right)
: "cc", "memory"
);
}
#define asm_modSub_fast 1
@@ -3532,9 +3523,6 @@ static uint8_t vli_add(uint8_t *p_result, uint8_t *p_left, uint8_t *p_right)
uint8_t l_right;
__asm__ volatile (
"push r28 \n\t" /* Save Y */
"push r29 \n\t"
"movw r28, %A[rptr] \n\t" /* Copy p_right to Y */
"clc \n\t"
"1: \n\t"
@@ -3547,12 +3535,11 @@ static uint8_t vli_add(uint8_t *p_result, uint8_t *p_left, uint8_t *p_right)
"adc %[carry], %[carry] \n\t" /* Store carry bit in l_carry. */
"pop r29 \n\t" /* Restore Y */
"pop r28 \n\t"
"sbiw r28, " STR(uECC_BYTES) " \n\t" /* Restore Y */
: "+z" (p_result), "+x" (p_left), [i] "+r" (i),
[carry] "+r" (l_carry), [left] "=r" (l_left), [right] "=r" (l_right)
: [rptr] "r" (p_right)
[carry] "+r" (l_carry), [left] "=&r" (l_left), [right] "=&r" (l_right)
: "y" (p_right)
: "cc", "memory"
);
return l_carry;
@@ -3569,9 +3556,6 @@ static uint8_t vli_sub(uint8_t *p_result, uint8_t *p_left, uint8_t *p_right)
uint8_t l_right;
__asm__ volatile (
"push r28 \n\t" /* Save Y */
"push r29 \n\t"
"movw r28, %A[rptr] \n\t" /* Copy p_right to Y */
"clc \n\t"
"1: \n\t"
@@ -3584,12 +3568,11 @@ static uint8_t vli_sub(uint8_t *p_result, uint8_t *p_left, uint8_t *p_right)
"adc %[borrow], %[borrow] \n\t" /* Store carry bit in l_borrow. */
"pop r29 \n\t" /* Restore Y */
"pop r28 \n\t"
"sbiw r28, " STR(uECC_BYTES) " \n\t" /* Restore Y */
: "+z" (p_result), "+x" (p_left), [i] "+r" (i),
[borrow] "+r" (l_borrow), [left] "=r" (l_left), [right] "=r" (l_right)
: [rptr] "r" (p_right)
[borrow] "+r" (l_borrow), [left] "=&r" (l_left), [right] "=&r" (l_right)
: "y" (p_right)
: "cc", "memory"
);
return l_borrow;
@@ -3598,6 +3581,7 @@ static uint8_t vli_sub(uint8_t *p_result, uint8_t *p_left, uint8_t *p_right)
#endif
#if !asm_mult
__attribute((noinline))
static void vli_mult(uint8_t *p_result, uint8_t *p_left, uint8_t *p_right)
{
uint8_t r0 = 0;
@@ -3606,17 +3590,15 @@ static void vli_mult(uint8_t *p_result, uint8_t *p_left, uint8_t *p_right)
uint8_t l_zero = 0;
uint8_t k, i;
__asm__ volatile (
"push r28 \n\t" /* Save Y */
"push r29 \n\t"
"movw r28, %A[rptr] \n\t" /* Copy p_right to Y */
"ldi r18, 1 \n\t" /* k loops from 1 to uECC_BYTES */
"ldi %[k], 1 \n\t" /* k = 1; k < uECC_BYTES; ++k */
"1: \n\t"
"ldi r19, 0 \n\t"
"ldi %[i], 0 \n\t" /* i=0; i < k; ++i */
"add r28, r18 \n\t" /* pre-add right ptr */
"add r28, %[k] \n\t" /* pre-add right ptr */
"adc r29, %[zero] \n\t"
"2: \n\t"
@@ -3628,11 +3610,11 @@ static void vli_mult(uint8_t *p_result, uint8_t *p_left, uint8_t *p_right)
"adc %[r1], r1 \n\t"
"adc %[r2], %[zero] \n\t"
"inc r19 \n\t"
"cp r19, r18 \n\t"
"inc %[i] \n\t"
"cp %[i], %[k] \n\t"
"brlo 2b \n\t" /* loop if i < k */
"sub r26, r18 \n\t" /* fix up left ptr */
"sub r26, %[k] \n\t" /* fix up left ptr */
"sbc r27, %[zero] \n\t"
"st z+, %[r0] \n\t" /* Store the result. */
@@ -3640,18 +3622,16 @@ static void vli_mult(uint8_t *p_result, uint8_t *p_left, uint8_t *p_right)
"mov %[r1], %[r2] \n\t"
"mov %[r2], %[zero] \n\t"
"inc r18 \n\t"
"cpi r18, " STR(uECC_BYTES) " \n\t"
"brlo 1b \n\t" /* loop if k <= uECC_BYTES */
"breq 1b \n\t" /* loop if k <= uECC_BYTES */
"inc %[k] \n\t"
"cpi %[k], " STR(uECC_BYTES) " \n\t"
"brlo 1b \n\t" /* loop if k < uECC_BYTES */
/* second half */
"ldi r18, " STR(DEC(uECC_BYTES)) " \n\t" /* k = uECC_BYTES-1 */
"adiw r26, 1 \n\t" /* move left ptr up 1 */
"ldi %[k], " STR(uECC_BYTES) " \n\t" /* k = uECC_BYTES; k > 0; --k */
"adiw r28, " STR(uECC_BYTES) " \n\t" /* move right ptr to point at the end of p_right */
"1: \n\t"
"ldi r19, 0 \n\t"
"ldi %[i], 0 \n\t" /* i=0; i < k; ++i */
"2: \n\t"
"ld r0, x+ \n\t"
@@ -3662,11 +3642,11 @@ static void vli_mult(uint8_t *p_result, uint8_t *p_left, uint8_t *p_right)
"adc %[r1], r1 \n\t"
"adc %[r2], %[zero] \n\t"
"inc r19 \n\t"
"cp r19, r18 \n\t"
"inc %[i] \n\t"
"cp %[i], %[k] \n\t"
"brlo 2b \n\t" /* loop if i < k */
"add r28, r18 \n\t" /* fix up right ptr */
"add r28, %[k] \n\t" /* fix up right ptr */
"adc r29, %[zero] \n\t"
"st z+, %[r0] \n\t" /* Store the result. */
@@ -3674,23 +3654,24 @@ static void vli_mult(uint8_t *p_result, uint8_t *p_left, uint8_t *p_right)
"mov %[r1], %[r2] \n\t"
"mov %[r2], %[zero] \n\t"
"dec r18 \n\t"
"sub r26, r18 \n\t" /* fix up left ptr (after k is decremented, so next time we start 1 higher) */
"dec %[k] \n\t"
"sub r26, %[k] \n\t" /* fix up left ptr (after k is decremented, so next time we start 1 higher) */
"sbc r27, %[zero] \n\t"
"cpi r18, 0 \n\t"
"cpi %[k], 0 \n\t"
"brne 1b \n\t" /* loop if k > 0 */
"st z+, %[r0] \n\t" /* Store last result byte. */
"eor r1, r1 \n\t" /* fix r1 to be 0 again */
"pop r29 \n\t" /* Restore Y */
"pop r28 \n\t"
"sbiw r28, " STR(uECC_BYTES) " \n\t" /* Restore Y */
: "+z" (p_result), "+x" (p_left),
[r0] "+r" (r0), [r1] "+r" (r1), [r2] "+r" (r2), [zero] "+r" (l_zero)
: [rptr] "r" (p_right)
: "r0", "r18", "r19", "cc", "memory"
[r0] "+r" (r0), [r1] "+r" (r1), [r2] "+r" (r2), [zero] "+r" (l_zero),
[k] "=&r" (k), [i] "=&r" (i)
: "y" (p_right)
: "r0", "cc", "memory"
);
}
#define asm_mult 1