Module: xenomai-3
Branch: next
Commit: 822b9b4828fc4381eb15f927c69d88401b21205b
URL:
http://git.xenomai.org/?p=xenomai-3.git;a=commit;h=822b9b4828fc4381eb15f927c69d88401b21205b
Author: Don Mahurin <d...@mperpetuo.com>
Date: Mon Sep 14 12:52:27 2015 -0700
cobalt/arm64: Use empty mayday implementation for arm64.
The arm mayday implementation was not correct for arm64. Replace with empty
implementation.
Handle mayday in the linux domain, using xnthread_relax. This change is
essentially the same as the general change proposed in the 'Mayday issues
again' discussion (Jan Kiszka, Jun 21), though only applied to arch/arm64.
---
kernel/cobalt/arch/arm64/mayday.c | 86 +------------------------------------
1 file changed, 1 insertion(+), 85 deletions(-)
diff --git a/kernel/cobalt/arch/arm64/mayday.c
b/kernel/cobalt/arch/arm64/mayday.c
index bc51ad6..ca1151c 100644
--- a/kernel/cobalt/arch/arm64/mayday.c
+++ b/kernel/cobalt/arch/arm64/mayday.c
@@ -28,72 +28,6 @@ static void *mayday;
static inline void setup_mayday(void *page)
{
- /*
- * We want this code to appear at the top of the MAYDAY page:
- *
- * ifdef ARM_EABI
- *
- * e59f000c ldr r0, [pc, #12]
- * e59f700c ldr r7, [pc, #12]
- * ef000000 svc 0x00000000
- * e3a00000 mov r0, #0
- * e5800000 str r0, [r0] ; <bug>
- * 1000005e .word 0x1000005e ; sc_cobalt_mayday |
__COBALT_SYSCALL_BIT
- * 000f0042 .word 0x000f0042
- *
- * elif ARM_OABI
- *
- * e59f0008 ldr r0, [pc, #8]
- * ef9f0042 swi 0x009f0042
- * e3a00000 mov r0, #0
- * e5800000 str r0, [r0] ; <bug>
- * 1000005e .word 0x1000005e ; sc_cobalt_mayday |
__COBALT_SYSCALL_BIT
- *
- * endif
- *
- * 32bit instruction words will be laid out by the compiler as
- * the target endianness requires.
- *
- * We don't mess with CPSR here, so no need to save/restore it
- * in handle/fixup code.
- */
-#ifdef __ARM_EABI__
- static const struct {
- u32 ldr_r0;
- u32 ldr_r7;
- u32 swi_0;
- u32 mov_r0;
- u32 str_r0;
- u32 cst_r0;
- u32 cst_r7;
- } code = {
- .ldr_r0 = 0xe59f000c,
- .ldr_r7 = 0xe59f700c,
- .swi_0 = 0xef000000,
- .mov_r0 = 0xe3a00000,
- .str_r0 = 0xe5800000,
- .cst_r0 = __xn_syscode(sc_cobalt_mayday),
- .cst_r7 = 0x000f0042,
- };
-#else /* OABI */
- static const struct {
- u32 ldr_r0;
- u32 swi_syscall;
- u32 mov_r0;
- u32 str_r0;
- u32 cst_r0;
- } code = {
- .ldr_r0 = 0xe59f0008,
- .swi_syscall = 0xef9f0042,
- .mov_r0 = 0xe3a00000,
- .str_r0 = 0xe5800000,
- .cst_r0 = __xn_syscode(sc_cobalt_mayday),
- };
-#endif /* OABI */
-
- memcpy(page, &code, sizeof(code));
-
- flush_dcache_page(vmalloc_to_page(page));
}
int xnarch_init_mayday(void)
@@ -120,27 +54,9 @@ void *xnarch_get_mayday_page(void)
void xnarch_handle_mayday(struct xnarchtcb *tcb, struct pt_regs *regs,
unsigned long tramp)
{
- tcb->mayday.pc = regs->pc;
- tcb->mayday.r0 = regs->regs[0];
-#ifdef __ARM_EABI__
- tcb->mayday.r7 = regs->regs[7];
-#endif
-#ifdef CONFIG_ARM_THUMB
- /* The code on the mayday page must be run in ARM mode */
- tcb->mayday.psr = regs->cpsr;
- regs->cpsr &= ~PSR_T_BIT;
-#endif
- regs->pc = tramp;
+ xnthread_relax(0, 0);
}
void xnarch_fixup_mayday(struct xnarchtcb *tcb, struct pt_regs *regs)
{
- regs->pc = tcb->mayday.pc;
- regs->regs[0] = tcb->mayday.r0;
-#ifdef __ARM_EABI__
- regs->regs[7] = tcb->mayday.r7;
-#endif
-#ifdef CONFIG_ARM_THUMB
- regs->cpsr = tcb->mayday.psr;
-#endif
}
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