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Jz4740:

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* Optimize & cleanup thread handling a bit
 * Unify exception return and fix a potential bug


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20659 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Maurus Cuelenaere 2009-04-08 14:30:33 +00:00
parent 87efb79682
commit c606fd04c8
2 changed files with 50 additions and 101 deletions
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75
firmware/thread.c
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@ -937,23 +937,23 @@ static inline void core_sleep(void)
void start_thread(void); /* Provide C access to ASM label */
static void __attribute__((used)) _start_thread(void)
{
/* $t1 = context */
/* t1 = context */
asm volatile (
"start_thread: \n"
".set noreorder \n"
".set noat \n"
"lw $8, 4($9) \n" /* Fetch thread function pointer ($8 = $t0, $9 = $t1) */
"lw $8, 4($9) \n" /* Fetch thread function pointer ($8 = t0, $9 = t1) */
"lw $29, 40($9) \n" /* Set initial sp(=$29) */
"jalr $8 \n" /* Start the thread */
"sw $0, 48($9) \n" /* Clear start address */
"jr $8 \n" /* Start the thread */
"nop \n"
".set at \n"
".set reorder \n"
::: "t0"
);
thread_exit();
}
/* Place context pointer in $s0 slot, function pointer in $s1 slot, and
/* Place context pointer in s0 slot, function pointer in s1 slot, and
* start_thread pointer in context_start */
#define THREAD_STARTUP_INIT(core, thread, function) \
({ (thread)->context.r[0] = (uint32_t)&(thread)->context, \
@ -969,22 +969,21 @@ static inline void store_context(void* addr)
asm volatile (
".set noreorder \n"
".set noat \n"
"move $8, %0 \n"
"sw $16, 0($8) \n" /* $s0 */
"sw $17, 4($8) \n" /* $s1 */
"sw $18, 8($8) \n" /* $s2 */
"sw $19, 12($8) \n" /* $s3 */
"sw $20, 16($8) \n" /* $s4 */
"sw $21, 20($8) \n" /* $s5 */
"sw $22, 24($8) \n" /* $s6 */
"sw $23, 28($8) \n" /* $s7 */
"sw $28, 32($8) \n" /* gp */
"sw $30, 36($8) \n" /* fp */
"sw $29, 40($8) \n" /* sp */
"sw $31, 44($8) \n" /* ra */
"sw $16, 0(%0) \n" /* s0 */
"sw $17, 4(%0) \n" /* s1 */
"sw $18, 8(%0) \n" /* s2 */
"sw $19, 12(%0) \n" /* s3 */
"sw $20, 16(%0) \n" /* s4 */
"sw $21, 20(%0) \n" /* s5 */
"sw $22, 24(%0) \n" /* s6 */
"sw $23, 28(%0) \n" /* s7 */
"sw $28, 32(%0) \n" /* gp */
"sw $30, 36(%0) \n" /* fp */
"sw $29, 40(%0) \n" /* sp */
"sw $31, 44(%0) \n" /* ra */
".set at \n"
".set reorder \n"
: : "r" (addr) : "t0"
: : "r" (addr)
);
}
@ -997,29 +996,27 @@ static inline void load_context(const void* addr)
asm volatile (
".set noat \n"
".set noreorder \n"
"lw $8, 48(%0) \n" /* Get start address ($8 = $t0) */
"lw $8, 48(%0) \n" /* Get start address ($8 = t0) */
"beqz $8, running \n" /* NULL -> already running */
"nop \n"
"move $9, %0 \n" /* $t1 = context */
"jr $8 \n"
"nop \n"
"move $9, %0 \n" /* t1 = context */
"running: \n"
"move $8, %0 \n"
"lw $16, 0($8) \n" /* $s0 */
"lw $17, 4($8) \n" /* $s1 */
"lw $18, 8($8) \n" /* $s2 */
"lw $19, 12($8) \n" /* $s3 */
"lw $20, 16($8) \n" /* $s4 */
"lw $21, 20($8) \n" /* $s5 */
"lw $22, 24($8) \n" /* $s6 */
"lw $23, 28($8) \n" /* $s7 */
"lw $28, 32($8) \n" /* gp */
"lw $30, 36($8) \n" /* fp */
"lw $29, 40($8) \n" /* sp */
"lw $31, 44($8) \n" /* ra */
"lw $16, 0(%0) \n" /* s0 */
"lw $17, 4(%0) \n" /* s1 */
"lw $18, 8(%0) \n" /* s2 */
"lw $19, 12(%0) \n" /* s3 */
"lw $20, 16(%0) \n" /* s4 */
"lw $21, 20(%0) \n" /* s5 */
"lw $22, 24(%0) \n" /* s6 */
"lw $23, 28(%0) \n" /* s7 */
"lw $28, 32(%0) \n" /* gp */
"lw $30, 36(%0) \n" /* fp */
"lw $29, 40(%0) \n" /* sp */
"lw $31, 44(%0) \n" /* ra */
".set at \n"
".set reorder \n"
: : "r" (addr) : "t0" /* only! */
: : "r" (addr) : "t0", "t1"
);
}
@ -1033,9 +1030,9 @@ static inline void core_sleep(void)
__cpm_idle_mode();
#endif
asm volatile(".set mips32r2 \n"
"mfc0 $8, $12 \n" /* mfc $t0, $12 */
"move $9, $8 \n" /* move $t1, $t0 */
"la $10, 0x8000000 \n" /* la $t2, 0x8000000 */
"mfc0 $8, $12 \n" /* mfc t0, $12 */
"move $9, $8 \n" /* move t1, t0 */
"la $10, 0x8000000 \n" /* la t2, 0x8000000 */
"or $8, $8, $10 \n" /* Enable reduced power mode */
"mtc0 $8, $12 \n"
"wait \n"