From 6e83557c38b40d6e9d1c82ad0ae59d8e5db9c50c Mon Sep 17 00:00:00 2001 From: Michal Simek Date: Mon, 31 Jan 2011 15:10:04 +0100 Subject: microblaze: Remove r0_ram pointer and PTO alignment r0_ram pool was used for saving/restoring register content if hw exception happen. This poll was replaced by pt_pool_space with PT_SIZE size. Based on this change SAVE_STATE_ARG_SPACE was removed which caused that PTO offset is zero that's why is also removed. r0_ram space was used as scratchpad by v850. In early Microblaze Linux developing phase was this part of code blindly copied. Signed-off-by: Michal Simek --- arch/microblaze/kernel/hw_exception_handler.S | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) (limited to 'arch/microblaze/kernel/hw_exception_handler.S') diff --git a/arch/microblaze/kernel/hw_exception_handler.S b/arch/microblaze/kernel/hw_exception_handler.S index ec5e99dd5d75..2401fa4b7ce1 100644 --- a/arch/microblaze/kernel/hw_exception_handler.S +++ b/arch/microblaze/kernel/hw_exception_handler.S @@ -93,7 +93,7 @@ lwi r6, r1, PT_R6; \ lwi r11, r1, PT_R11; \ lwi r31, r1, PT_R31; \ - lwi r1, r0, TOPHYS(r0_ram + 0); + lwi r1, r1, PT_R1; #endif /* CONFIG_MMU */ #define LWREG_NOP \ @@ -208,8 +208,8 @@ * | . | * | . | * - * NO_MMU kernel use the same r0_ram pointed space - look to vmlinux.lds.S - * which is used for storing register values - old style was, that value were + * MMU kernel uses the same 'pt_pool_space' pointed space + * which is used for storing register values - noMMu style was, that values were * stored in stack but in case of failure you lost information about register. * Currently you can see register value in memory in specific place. * In compare to with previous solution the speed should be the same. @@ -228,8 +228,12 @@ */ /* wrappers to restore state before coming to entry.S */ - #ifdef CONFIG_MMU +.section .data +.align 4 +pt_pool_space: + .space PT_SIZE + #ifdef DEBUG /* Create space for exception counting. */ .section .data @@ -299,10 +303,10 @@ _hw_exception_handler: #ifndef CONFIG_MMU addik r1, r1, -(EX_HANDLER_STACK_SIZ); /* Create stack frame */ #else - swi r1, r0, TOPHYS(r0_ram + 0); /* GET_SP */ + swi r1, r0, TOPHYS(pt_pool_space + PT_R1); /* GET_SP */ /* Save date to kernel memory. Here is the problem * when you came from user space */ - ori r1, r0, TOPHYS(r0_ram + 28); + ori r1, r0, TOPHYS(pt_pool_space); #endif swi r3, r1, PT_R3 swi r4, r1, PT_R4 -- cgit v1.2.3