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Using ARM Unified Assembler Language

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Change-Id: Iae32a8ba8eff6087330e458fafc912a12fee4509
This commit is contained in:
Chris Chua 2023-03-19 06:22:08 +11:00 • committed by Aidan MacDonald
parent a64cad847e
commit 86429dbf1e
23 changed files with 139 additions and 127 deletions
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7
firmware/target/arm/pp/pcm-pp.c
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@ -327,6 +327,7 @@ void fiq_playback(void)
*/
asm volatile (
/* No external calls */
".syntax unified \n"
"sub lr, lr, #4 \n" /* Prepare return address */
"stmfd sp!, { lr } \n" /* stack lr so we can use it */
"ldr r12, =0xcf001040 \n" /* Some magic from iPodLinux ... */
@ -349,8 +350,8 @@ void fiq_playback(void)
"bhi 0b \n" /* ... yes, continue */
"cmp r9, #0 \n" /* either FIFO full or size empty? */
"stmneia r11, { r8-r9 } \n" /* save p and size, if not empty */
"ldmnefd sp!, { pc }^ \n" /* RFE if not empty */
"stmiane r11, { r8-r9 } \n" /* save p and size, if not empty */
"ldmfdne sp!, { pc }^ \n" /* RFE if not empty */
/* Making external calls */
"1: \n"
@ -363,7 +364,7 @@ void fiq_playback(void)
"mov lr, pc \n" /* long call (not in same section) */
"bx r3 \n"
"cmp r0, #0 \n" /* more data? */
"ldmeqfd sp!, { r0-r3, pc }^ \n" /* no? -> exit */
"ldmfdeq sp!, { r0-r3, pc }^ \n" /* no? -> exit */
"ldr r14, [r10, #0x1c] \n" /* read IISFIFO_CFG to check FIFO status */
"ands r14, r14, #(0xe<<23) \n" /* r14 = (IIS_TX_FREE_COUNT & ~1) << 23 */