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| author | Michal Simek <monstr@monstr.eu> | 2011-01-31 15:10:04 +0100 |
|---|---|---|
| committer | Michal Simek <monstr@monstr.eu> | 2011-03-09 08:09:54 +0100 |
| commit | 6e83557c38b40d6e9d1c82ad0ae59d8e5db9c50c (patch) | |
| tree | 856d8cf13273c2f8a696473ff9237cdc17c46632 /arch/microblaze/kernel/hw_exception_handler.S | |
| parent | microblaze: Do not use r0_ram space for syscall debugging (diff) | |
| download | linux-6e83557c38b40d6e9d1c82ad0ae59d8e5db9c50c.tar.xz linux-6e83557c38b40d6e9d1c82ad0ae59d8e5db9c50c.zip | |
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 <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze/kernel/hw_exception_handler.S')
| -rw-r--r-- | arch/microblaze/kernel/hw_exception_handler.S | 16 |
1 files changed, 10 insertions, 6 deletions
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 |