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Commit 653e447e authored by Michal Simek's avatar Michal Simek
Browse files

microblaze: Completely remove working with R11 register 



We don't need to save R11 register. There is easy way
to use only R1 which is saved and restore later.

Signed-off-by: default avatarMichal Simek <monstr@monstr.eu>
parent 0388107d

arch/microblaze/kernel/entry.S

+21 −41
Original line number Diff line number Diff line
@@ -273,18 +273,15 @@ 
C_ENTRY(_user_exception):

	swi	r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) /* save stack */

	addi	r14, r14, 4	/* return address is 4 byte after call */

	swi	r11, r0, TOPHYS(r0_ram + PTO + PT_R11);	/* Save r11 */



	mfs	r11, rmsr

	mfs	r1, rmsr

	nop

	andi	r11, r11, MSR_UMS

	bnei	r11, 1f

	andi	r1, r1, MSR_UMS

	bnei	r1, 1f



/* Kernel-mode state save - kernel execve */

	lwi	r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); /* Reload kernel stack-ptr*/

	tophys(r1,r11);

	swi	r11, r1, (PT_R1-PT_SIZE); /* Save original SP. */

	lwi	r11, r0, TOPHYS(r0_ram + PTO + PT_R11); /* restore r11 */

	lwi	r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); /* Reload kernel stack-ptr*/

	tophys(r1,r1);



	addik	r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */

	SAVE_REGS
@@ -296,7 +293,6 @@ C_ENTRY(_user_exception): 


/* User-mode state save.  */

1:

	lwi	r11, r0, TOPHYS(r0_ram + PTO + PT_R11);	/* restore r11 */

	lwi	r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */

	tophys(r1,r1);

	lwi	r1, r1, TS_THREAD_INFO;	/* get stack from task_struct */
@@ -506,18 +502,15 @@ C_ENTRY(sys_rt_sigreturn_wrapper): 


#define SAVE_STATE	\

	swi	r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); /* save stack */	\

	swi	r11, r0, TOPHYS(r0_ram + PTO + PT_R11); /* Save r11 */	\

	/* See if already in kernel mode.*/				\

	mfs	r11, rmsr;						\

	mfs	r1, rmsr;						\

	nop;								\

	andi	r11, r11, MSR_UMS;					\

	bnei	r11, 1f;						\

	andi	r1, r1, MSR_UMS;					\

	bnei	r1, 1f;						\

	/* Kernel-mode state save.  */					\

	/* Reload kernel stack-ptr. */					\

	lwi	r11, r0, TOPHYS(PER_CPU(ENTRY_SP));			\

	tophys(r1,r11);							\

	swi	r11, r1, (PT_R1-PT_SIZE); /* Save original SP. */	\

	lwi	r11, r0, TOPHYS(r0_ram + PTO + PT_R11); /* restore r11 */\

	lwi	r1, r0, TOPHYS(PER_CPU(ENTRY_SP));			\

	tophys(r1,r1);							\

	addik	r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack.  */\

	SAVE_REGS							\

	/* PC, before IRQ/trap - this is one instruction above */	\
@@ -528,13 +521,11 @@ C_ENTRY(sys_rt_sigreturn_wrapper): 
	brid	2f;							\

	nop;				/* Fill delay slot */		\

1:	/* User-mode state save.  */					\

	lwi	r11, r0, TOPHYS(r0_ram + PTO + PT_R11); /* restore r11 */\

	lwi	r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */\

	tophys(r1,r1);							\

	lwi	r1, r1, TS_THREAD_INFO;	/* get the thread info */	\

	addik	r1, r1, THREAD_SIZE;	/* calculate kernel stack pointer */\

	tophys(r1,r1);							\

									\

	addik	r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack.  */\

	SAVE_REGS							\

	/* PC, before IRQ/trap - this is one instruction above FIXME*/	\
@@ -726,20 +717,15 @@ C_ENTRY(_interrupt): 
/* MS: we are in physical address */

/* Save registers, switch to proper stack, convert SP to virtual.*/

	swi	r1, r0, TOPHYS(PER_CPU(ENTRY_SP))

	swi	r11, r0, TOPHYS(PER_CPU(R11_SAVE));

	/* MS: See if already in kernel mode. */

	mfs	r11, rmsr

	mfs	r1, rmsr

	nop

	andi	r11, r11, MSR_UMS

	bnei	r11, 1f

	andi	r1, r1, MSR_UMS

	bnei	r1, 1f



/* Kernel-mode state save. */

	or	r11, r1, r0

	tophys(r1,r11); /* MS: I have in r1 physical address where stack is */

/* MS: Save original SP - position PT_R1 to next stack frame 4 *1 - 152*/

	swi	r11, r1, (PT_R1 - PT_SIZE);

/* MS: restore r11 because of saving in SAVE_REGS */

	lwi	r11, r0, TOPHYS(PER_CPU(R11_SAVE));

	lwi	r1, r0, TOPHYS(PER_CPU(ENTRY_SP))

	tophys(r1,r1); /* MS: I have in r1 physical address where stack is */

	/* save registers */

/* MS: Make room on the stack -> activation record */

	addik	r1, r1, -STATE_SAVE_SIZE;
@@ -752,8 +738,6 @@ C_ENTRY(_interrupt): 


1:

/* User-mode state save. */

/* MS: restore r11 -> FIXME move before SAVE_REG */

	lwi	r11, r0, TOPHYS(PER_CPU(R11_SAVE));

 /* MS: get the saved current */

	lwi	r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE));

	tophys(r1,r1);
@@ -855,16 +839,13 @@ C_ENTRY(_debug_exception): 
	/* BIP bit is set on entry, no interrupts can occur */

	swi	r1, r0, TOPHYS(PER_CPU(ENTRY_SP))



	swi	r11, r0, TOPHYS(r0_ram + PTO + PT_R11); /* Save r11 */

	mfs	r11, rmsr

	mfs	r1, rmsr

	nop

	andi	r11, r11, MSR_UMS

	bnei	r11, 1f

	andi	r1, r1, MSR_UMS

	bnei	r1, 1f

	/* Kernel-mode state save.  */

	lwi	r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); /* Reload kernel stack-ptr*/

	tophys(r1,r11);

	swi	r11, r1, (PT_R1-PT_SIZE); /* Save original SP. */

	lwi	r11, r0, TOPHYS(r0_ram + PTO + PT_R11); /* restore r11 */

	lwi	r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); /* Reload kernel stack-ptr*/

	tophys(r1,r1);



	addik	r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack.  */

	SAVE_REGS;
@@ -874,7 +855,6 @@ C_ENTRY(_debug_exception): 
	brid	2f;

	nop;				/* Fill delay slot */

1:      /* User-mode state save.  */

	lwi	r11, r0, TOPHYS(r0_ram + PTO + PT_R11); /* restore r11 */

	lwi	r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */

	tophys(r1,r1);

	lwi	r1, r1, TS_THREAD_INFO;	/* get the thread info */
@@ -887,7 +867,7 @@ C_ENTRY(_debug_exception): 
	swi	r0, r1, PTO+PT_MODE; /* Was in user-mode.  */

	lwi	r11, r0, TOPHYS(PER_CPU(ENTRY_SP));

	swi	r11, r1, PTO+PT_R1; /* Store user SP.  */

2:	lwi	CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE));

2:

	/* Save away the syscall number.  */

	swi	r0, r1, PTO+PT_R0;

	tovirt(r1,r1)