stm32l4x.c: Free r6/7 for 64-bit operations.

[fw/openocd] / contrib / loaders / flash / stm32l4x.S

diff --git a/contrib/loaders/flash/stm32l4x.S b/contrib/loaders/flash/stm32l4x.S
index f58e09894ea7017c6274b9176d6acd12a1d152d2..587cc33a99abcde691956de3926628153ce80ec4 100644 (file)
--- a/contrib/loaders/flash/stm32l4x.S
+++ b/contrib/loaders/flash/stm32l4x.S
@@ -51,8 +51,8 @@
  * r4 = flash base
  *
  * Clobbered:
+ * r5 - rp
  * r6 - temp
- * r7 - rp
  * r8 - wp, tmp
  */
 
@@ -63,18 +63,18 @@ wait_fifo:
        ldr     r8, [r0, #0]    /* read wp */
        cmp     r8, #0          /* abort if wp == 0 */
        beq     exit
-       ldr     r7, [r0, #4]    /* read rp */
-       subs    r6, r8, r7      /* number of bytes available for read in r6*/
+       ldr     r5, [r0, #4]    /* read rp */
+       subs    r6, r8, r5      /* number of bytes available for read in r6*/
        cmp     r6, #7          /* wait until 8 bytes are available */
        bcc     wait_fifo
 
        ldr     r6, STM32_PROG
        str     r6, [r4, #STM32_FLASH_CR_OFFSET]
-       ldr     r6, [r7], #0x04 /* read one word from src, increment ptr */
+       ldr     r6, [r5], #0x04 /* read one word from src, increment ptr */
        str     r6, [r2], #0x04 /* write one word to dst, increment ptr */
-       ldr     r6, [r7], #0x04 /* read one word from src, increment ptr */
+       ldr     r6, [r5], #0x04 /* read one word from src, increment ptr */
        str     r6, [r2], #0x04 /* write one word to dst, increment ptr */
-        dsb
+       dsb
 busy:
        ldr     r6, [r4, #STM32_FLASH_SR_OFFSET]
        tst     r6, #0x10000    /* BSY (bit16) == 1 => operation in progress */
@@ -82,10 +82,10 @@ busy:
        tst     r6, #0xfa       /* PGSERR | PGPERR | PGAERR | WRPERR | PROGERR*/
        bne     error           /* fail... */
 
-       cmp     r7, r1          /* wrap rp at end of buffer */
+       cmp     r5, r1          /* wrap rp at end of buffer */
        it      cs
-       addcs   r7, r0, #8      /* skip loader args */
-       str     r7, [r0, #4]    /* store rp */
+       addcs   r5, r0, #8      /* skip loader args */
+       str     r5, [r0, #4]    /* store rp */
        subs    r3, r3, #1      /* decrement dword count */
        cbz     r3, exit        /* loop if not done */
        b       wait_fifo