ARC: Increase readability of entry handlers
* use artificial PUSH/POP contructs for CORE Reg save/restore to stack * use artificial PUSHAX/POPAX contructs for Auxiliary Space regs * macro'ize multiple copies of callee-reg-save/restore (SAVE_R13_TO_R24) * use BIC insn for inverse-and operation Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta
parent
16f9afe651
commit
3ebedbb2fd
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@ -50,150 +50,155 @@
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* Eff Addr for load = [reg2]
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*/
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/*--------------------------------------------------------------
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* Save caller saved registers (scratch registers) ( r0 - r12 )
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* Registers are pushed / popped in the order defined in struct ptregs
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* in asm/ptrace.h
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*-------------------------------------------------------------*/
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.macro SAVE_CALLER_SAVED
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st.a r0, [sp, -4]
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st.a r1, [sp, -4]
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st.a r2, [sp, -4]
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st.a r3, [sp, -4]
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st.a r4, [sp, -4]
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st.a r5, [sp, -4]
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st.a r6, [sp, -4]
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st.a r7, [sp, -4]
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st.a r8, [sp, -4]
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st.a r9, [sp, -4]
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st.a r10, [sp, -4]
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st.a r11, [sp, -4]
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st.a r12, [sp, -4]
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.macro PUSH reg
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st.a \reg, [sp, -4]
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.endm
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.macro PUSHAX aux
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lr r9, [\aux]
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PUSH r9
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.endm
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.macro POP reg
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ld.ab \reg, [sp, 4]
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.endm
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.macro POPAX aux
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POP r9
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sr r9, [\aux]
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.endm
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/*--------------------------------------------------------------
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* Restore caller saved registers (scratch registers)
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* Helpers to save/restore Scratch Regs:
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* used by Interrupt/Exception Prologue/Epilogue
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*-------------------------------------------------------------*/
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.macro RESTORE_CALLER_SAVED
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ld.ab r12, [sp, 4]
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ld.ab r11, [sp, 4]
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ld.ab r10, [sp, 4]
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ld.ab r9, [sp, 4]
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ld.ab r8, [sp, 4]
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ld.ab r7, [sp, 4]
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ld.ab r6, [sp, 4]
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ld.ab r5, [sp, 4]
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ld.ab r4, [sp, 4]
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ld.ab r3, [sp, 4]
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ld.ab r2, [sp, 4]
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ld.ab r1, [sp, 4]
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ld.ab r0, [sp, 4]
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.macro SAVE_R0_TO_R12
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PUSH r0
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PUSH r1
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PUSH r2
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PUSH r3
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PUSH r4
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PUSH r5
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PUSH r6
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PUSH r7
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PUSH r8
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PUSH r9
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PUSH r10
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PUSH r11
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PUSH r12
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.endm
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.macro RESTORE_R12_TO_R0
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POP r12
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POP r11
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POP r10
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POP r9
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POP r8
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POP r7
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POP r6
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POP r5
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POP r4
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POP r3
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POP r2
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POP r1
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POP r0
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.endm
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/*--------------------------------------------------------------
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* Helpers to save/restore callee-saved regs:
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* used by several macros below
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*-------------------------------------------------------------*/
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.macro SAVE_R13_TO_R24
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PUSH r13
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PUSH r14
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PUSH r15
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PUSH r16
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PUSH r17
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PUSH r18
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PUSH r19
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PUSH r20
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PUSH r21
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PUSH r22
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PUSH r23
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PUSH r24
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.endm
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.macro RESTORE_R24_TO_R13
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POP r24
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POP r23
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POP r22
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POP r21
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POP r20
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POP r19
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POP r18
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POP r17
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POP r16
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POP r15
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POP r14
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POP r13
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.endm
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/*--------------------------------------------------------------
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* Save callee saved registers (non scratch registers) ( r13 - r25 )
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* on kernel stack.
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* User mode callee regs need to be saved in case of
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* -fork and friends for replicating from parent to child
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* -before going into do_signal( ) for ptrace/core-dump
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* Special case handling is required for r25 in case it is used by kernel
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* for caching task ptr. Low level exception/ISR save user mode r25
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* into task->thread.user_r25. So it needs to be retrieved from there and
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* saved into kernel stack with rest of callee reg-file
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* Collect User Mode callee regs as struct callee_regs - needed by
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* fork/do_signal/unaligned-access-emulation.
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* (By default only scratch regs are saved on entry to kernel)
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*
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* Special handling for r25 if used for caching Task Pointer.
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* It would have been saved in task->thread.user_r25 already, but to keep
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* the interface same it is copied into regular r25 placeholder in
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* struct callee_regs.
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*-------------------------------------------------------------*/
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.macro SAVE_CALLEE_SAVED_USER
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st.a r13, [sp, -4]
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st.a r14, [sp, -4]
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st.a r15, [sp, -4]
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st.a r16, [sp, -4]
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st.a r17, [sp, -4]
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st.a r18, [sp, -4]
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st.a r19, [sp, -4]
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st.a r20, [sp, -4]
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st.a r21, [sp, -4]
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st.a r22, [sp, -4]
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st.a r23, [sp, -4]
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st.a r24, [sp, -4]
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SAVE_R13_TO_R24
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#ifdef CONFIG_ARC_CURR_IN_REG
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; Retrieve orig r25 and save it on stack
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ld r12, [r25, TASK_THREAD + THREAD_USER_R25]
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st.a r12, [sp, -4]
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#else
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st.a r25, [sp, -4]
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PUSH r25
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#endif
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.endm
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/*--------------------------------------------------------------
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* Save callee saved registers (non scratch registers) ( r13 - r25 )
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* kernel mode callee regs needed to be saved in case of context switch
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* If r25 is used for caching task pointer then that need not be saved
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* as it can be re-created from current task global
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* Save kernel Mode callee regs at the time of Contect Switch.
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*
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* Special handling for r25 if used for caching Task Pointer.
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* Kernel simply skips saving it since it will be loaded with
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* incoming task pointer anyways
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*-------------------------------------------------------------*/
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.macro SAVE_CALLEE_SAVED_KERNEL
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st.a r13, [sp, -4]
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st.a r14, [sp, -4]
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st.a r15, [sp, -4]
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st.a r16, [sp, -4]
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st.a r17, [sp, -4]
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st.a r18, [sp, -4]
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st.a r19, [sp, -4]
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st.a r20, [sp, -4]
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st.a r21, [sp, -4]
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st.a r22, [sp, -4]
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st.a r23, [sp, -4]
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st.a r24, [sp, -4]
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SAVE_R13_TO_R24
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#ifdef CONFIG_ARC_CURR_IN_REG
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sub sp, sp, 4
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#else
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st.a r25, [sp, -4]
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PUSH r25
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#endif
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.endm
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/*--------------------------------------------------------------
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* RESTORE_CALLEE_SAVED_KERNEL:
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* Loads callee (non scratch) Reg File by popping from Kernel mode stack.
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* This is reverse of SAVE_CALLEE_SAVED,
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*
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* NOTE:
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* Ideally this shd only be called in switch_to for loading
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* switched-IN task's CALLEE Reg File.
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* For all other cases RESTORE_CALLEE_SAVED_FAST must be used
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* which simply pops the stack w/o touching regs.
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* Opposite of SAVE_CALLEE_SAVED_KERNEL
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*-------------------------------------------------------------*/
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.macro RESTORE_CALLEE_SAVED_KERNEL
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#ifdef CONFIG_ARC_CURR_IN_REG
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add sp, sp, 4 /* skip usual r25 placeholder */
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#else
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ld.ab r25, [sp, 4]
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POP r25
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#endif
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ld.ab r24, [sp, 4]
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ld.ab r23, [sp, 4]
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ld.ab r22, [sp, 4]
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ld.ab r21, [sp, 4]
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ld.ab r20, [sp, 4]
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ld.ab r19, [sp, 4]
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ld.ab r18, [sp, 4]
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ld.ab r17, [sp, 4]
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ld.ab r16, [sp, 4]
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ld.ab r15, [sp, 4]
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ld.ab r14, [sp, 4]
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ld.ab r13, [sp, 4]
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RESTORE_R24_TO_R13
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.endm
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/*--------------------------------------------------------------
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* RESTORE_CALLEE_SAVED_USER:
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* This is called after do_signal where tracer might have changed callee regs
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* thus we need to restore the reg file.
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* Special case handling is required for r25 in case it is used by kernel
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* for caching task ptr. Ptrace would have modified on-kernel-stack value of
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* r25, which needs to be shoved back into task->thread.user_r25 where from
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* Low level exception/ISR return code will retrieve to populate with rest of
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* callee reg-file.
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* Opposite of SAVE_CALLEE_SAVED_USER
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*
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* ptrace tracer or unaligned-access fixup might have changed a user mode
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* callee reg which is saved back to usual r25 storage location
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*-------------------------------------------------------------*/
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.macro RESTORE_CALLEE_SAVED_USER
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@ -201,21 +206,9 @@
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ld.ab r12, [sp, 4]
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st r12, [r25, TASK_THREAD + THREAD_USER_R25]
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#else
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ld.ab r25, [sp, 4]
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POP r25
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#endif
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ld.ab r24, [sp, 4]
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ld.ab r23, [sp, 4]
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ld.ab r22, [sp, 4]
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ld.ab r21, [sp, 4]
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ld.ab r20, [sp, 4]
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ld.ab r19, [sp, 4]
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ld.ab r18, [sp, 4]
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ld.ab r17, [sp, 4]
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ld.ab r16, [sp, 4]
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ld.ab r15, [sp, 4]
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ld.ab r14, [sp, 4]
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ld.ab r13, [sp, 4]
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RESTORE_R24_TO_R13
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.endm
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/*--------------------------------------------------------------
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@ -357,7 +350,7 @@
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* @reg [OUT] &thread_info of "current"
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*/
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.macro GET_CURR_THR_INFO_FROM_SP reg
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and \reg, sp, ~(THREAD_SIZE - 1)
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bic \reg, sp, (THREAD_SIZE - 1)
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.endm
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/*
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@ -409,21 +402,16 @@
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/* Restore r9 used to code the early prologue */
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EXCPN_PROLOG_RESTORE_REG r9
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SAVE_CALLER_SAVED
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st.a r26, [sp, -4] /* gp */
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st.a fp, [sp, -4]
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st.a blink, [sp, -4]
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lr r9, [eret]
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st.a r9, [sp, -4]
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lr r9, [erstatus]
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st.a r9, [sp, -4]
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st.a lp_count, [sp, -4]
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lr r9, [lp_end]
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st.a r9, [sp, -4]
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lr r9, [lp_start]
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st.a r9, [sp, -4]
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lr r9, [erbta]
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st.a r9, [sp, -4]
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SAVE_R0_TO_R12
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PUSH gp
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PUSH fp
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PUSH blink
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PUSHAX eret
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PUSHAX erstatus
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PUSH lp_count
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PUSHAX lp_end
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PUSHAX lp_start
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PUSHAX erbta
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.endm
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/*--------------------------------------------------------------
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@ -463,22 +451,19 @@
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* by hardware and that is not good.
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*-------------------------------------------------------------*/
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.macro RESTORE_ALL_SYS
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ld.ab r9, [sp, 4]
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sr r9, [erbta]
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ld.ab r9, [sp, 4]
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sr r9, [lp_start]
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ld.ab r9, [sp, 4]
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sr r9, [lp_end]
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ld.ab r9, [sp, 4]
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mov lp_count, r9
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ld.ab r9, [sp, 4]
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sr r9, [erstatus]
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ld.ab r9, [sp, 4]
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sr r9, [eret]
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ld.ab blink, [sp, 4]
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ld.ab fp, [sp, 4]
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ld.ab r26, [sp, 4] /* gp */
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RESTORE_CALLER_SAVED
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POPAX erbta
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POPAX lp_start
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POPAX lp_end
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POP r9
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mov lp_count, r9 ;LD to lp_count is not allowed
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POPAX erstatus
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POPAX eret
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POP blink
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POP fp
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POP gp
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RESTORE_R12_TO_R0
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ld sp, [sp] /* restore original sp */
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/* orig_r0 and orig_r8 skipped automatically */
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@ -490,9 +475,7 @@
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*-------------------------------------------------------------*/
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.macro SAVE_ALL_INT1
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/* restore original r9 , saved in int1_saved_reg
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* It will be saved on stack in macro: SAVE_CALLER_SAVED
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*/
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/* restore original r9 to be saved as part of reg-file */
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#ifdef CONFIG_SMP
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lr r9, [ARC_REG_SCRATCH_DATA0]
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#else
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@ -502,20 +485,17 @@
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/* now we are ready to save the remaining context :) */
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st orig_r8_IS_IRQ1, [sp, 8] /* Event Type */
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st 0, [sp, 4] /* orig_r0 , N/A for IRQ */
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SAVE_CALLER_SAVED
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st.a r26, [sp, -4] /* gp */
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st.a fp, [sp, -4]
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st.a blink, [sp, -4]
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st.a ilink1, [sp, -4]
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lr r9, [status32_l1]
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st.a r9, [sp, -4]
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st.a lp_count, [sp, -4]
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lr r9, [lp_end]
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st.a r9, [sp, -4]
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lr r9, [lp_start]
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st.a r9, [sp, -4]
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lr r9, [bta_l1]
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st.a r9, [sp, -4]
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SAVE_R0_TO_R12
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PUSH gp
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PUSH fp
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PUSH blink
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PUSH ilink1
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PUSHAX status32_l1
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PUSH lp_count
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PUSHAX lp_end
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PUSHAX lp_start
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PUSHAX bta_l1
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.endm
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.macro SAVE_ALL_INT2
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@ -530,20 +510,17 @@
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/* now we are ready to save the remaining context :) */
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st orig_r8_IS_IRQ2, [sp, 8] /* Event Type */
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st 0, [sp, 4] /* orig_r0 , N/A for IRQ */
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SAVE_CALLER_SAVED
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st.a r26, [sp, -4] /* gp */
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st.a fp, [sp, -4]
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st.a blink, [sp, -4]
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st.a ilink2, [sp, -4]
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lr r9, [status32_l2]
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st.a r9, [sp, -4]
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st.a lp_count, [sp, -4]
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lr r9, [lp_end]
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st.a r9, [sp, -4]
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lr r9, [lp_start]
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st.a r9, [sp, -4]
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lr r9, [bta_l2]
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st.a r9, [sp, -4]
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SAVE_R0_TO_R12
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PUSH gp
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PUSH fp
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PUSH blink
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PUSH ilink2
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PUSHAX status32_l2
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PUSH lp_count
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PUSHAX lp_end
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PUSHAX lp_start
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PUSHAX bta_l2
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.endm
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/*--------------------------------------------------------------
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@ -557,48 +534,41 @@
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*-------------------------------------------------------------*/
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.macro RESTORE_ALL_INT1
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ld.ab r9, [sp, 4] /* Actual reg file */
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sr r9, [bta_l1]
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ld.ab r9, [sp, 4]
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sr r9, [lp_start]
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ld.ab r9, [sp, 4]
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sr r9, [lp_end]
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ld.ab r9, [sp, 4]
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mov lp_count, r9
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ld.ab r9, [sp, 4]
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sr r9, [status32_l1]
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ld.ab r9, [sp, 4]
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mov ilink1, r9
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ld.ab blink, [sp, 4]
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ld.ab fp, [sp, 4]
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ld.ab r26, [sp, 4] /* gp */
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RESTORE_CALLER_SAVED
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POPAX bta_l1
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POPAX lp_start
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POPAX lp_end
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POP r9
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mov lp_count, r9 ;LD to lp_count is not allowed
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POPAX status32_l1
|
||||
POP ilink1
|
||||
POP blink
|
||||
POP fp
|
||||
POP gp
|
||||
RESTORE_R12_TO_R0
|
||||
|
||||
ld sp, [sp] /* restore original sp */
|
||||
/* orig_r0 and orig_r8 skipped automatically */
|
||||
.endm
|
||||
|
||||
.macro RESTORE_ALL_INT2
|
||||
ld.ab r9, [sp, 4]
|
||||
sr r9, [bta_l2]
|
||||
ld.ab r9, [sp, 4]
|
||||
sr r9, [lp_start]
|
||||
ld.ab r9, [sp, 4]
|
||||
sr r9, [lp_end]
|
||||
ld.ab r9, [sp, 4]
|
||||
mov lp_count, r9
|
||||
ld.ab r9, [sp, 4]
|
||||
sr r9, [status32_l2]
|
||||
ld.ab r9, [sp, 4]
|
||||
mov ilink2, r9
|
||||
ld.ab blink, [sp, 4]
|
||||
ld.ab fp, [sp, 4]
|
||||
ld.ab r26, [sp, 4] /* gp */
|
||||
RESTORE_CALLER_SAVED
|
||||
POPAX bta_l2
|
||||
POPAX lp_start
|
||||
POPAX lp_end
|
||||
|
||||
POP r9
|
||||
mov lp_count, r9 ;LD to lp_count is not allowed
|
||||
|
||||
POPAX status32_l2
|
||||
POP ilink2
|
||||
POP blink
|
||||
POP fp
|
||||
POP gp
|
||||
RESTORE_R12_TO_R0
|
||||
|
||||
ld sp, [sp] /* restore original sp */
|
||||
/* orig_r0 and orig_r8 skipped automatically */
|
||||
|
||||
.endm
|
||||
|
||||
|
||||
|
|
|
|||
|
|
@ -73,6 +73,10 @@ asmlinkage void ret_from_fork(void);
|
|||
* ~ ~
|
||||
* | --to-- | (scratch Regs of user mode)
|
||||
* | r0 |
|
||||
* ------------------
|
||||
* | SP |
|
||||
* | orig_r0 |
|
||||
* | orig_r8 |
|
||||
* ------------------ <===== END of PAGE
|
||||
*/
|
||||
int copy_thread(unsigned long clone_flags,
|
||||
|
|
|
|||
Loading…
Reference in New Issue