forked from Minki/linux
microblaze: Use delay slot in syscall macros
Saving instruction with delay slot usage. Signed-off-by: Michal Simek <monstr@monstr.eu>
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da23355280
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9814cc11e5
@ -411,10 +411,8 @@ C_ENTRY(_user_exception):
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/* The syscall number is invalid, return an error. */
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5:
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rtsd r15, 8; /* looks like a normal subroutine return */
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addi r3, r0, -ENOSYS;
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rtsd r15,8; /* looks like a normal subroutine return */
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or r0, r0, r0
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/* Entry point used to return from a syscall/trap */
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/* We re-enable BIP bit before state restore */
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@ -491,9 +489,8 @@ C_ENTRY(sys_fork_wrapper):
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addik r7, r1, PTO /* Arg 2: parent context */
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add r8. r0, r0 /* Arg 3: (unused) */
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add r9, r0, r0; /* Arg 4: (unused) */
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add r10, r0, r0; /* Arg 5: (unused) */
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brid do_fork /* Do real work (tail-call) */
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nop;
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add r10, r0, r0; /* Arg 5: (unused) */
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/* This the initial entry point for a new child thread, with an appropriate
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stack in place that makes it look the the child is in the middle of an
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@ -504,9 +501,8 @@ C_ENTRY(ret_from_fork):
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bralid r15, schedule_tail; /* ...which is schedule_tail's arg */
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add r3, r5, r0; /* switch_thread returns the prev task */
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/* ( in the delay slot ) */
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add r3, r0, r0; /* Child's fork call should return 0. */
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brid ret_from_trap; /* Do normal trap return */
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nop;
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add r3, r0, r0; /* Child's fork call should return 0. */
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C_ENTRY(sys_vfork):
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brid microblaze_vfork /* Do real work (tail-call) */
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@ -518,21 +514,18 @@ C_ENTRY(sys_clone):
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1: addik r7, r1, PTO; /* Arg 2: parent context */
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add r8, r0, r0; /* Arg 3: (unused) */
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add r9, r0, r0; /* Arg 4: (unused) */
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add r10, r0, r0; /* Arg 5: (unused) */
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brid do_fork /* Do real work (tail-call) */
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nop;
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add r10, r0, r0; /* Arg 5: (unused) */
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C_ENTRY(sys_execve):
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addik r8, r1, PTO; /* add user context as 4th arg */
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brid microblaze_execve; /* Do real work (tail-call).*/
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nop;
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addik r8, r1, PTO; /* add user context as 4th arg */
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C_ENTRY(sys_rt_sigreturn_wrapper):
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swi r3, r1, PTO+PT_R3; /* restore saved r3, r4 registers */
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swi r4, r1, PTO+PT_R4;
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addik r5, r1, PTO; /* add user context as 1st arg */
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brlid r15, sys_rt_sigreturn /* Do real work */
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nop;
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addik r5, r1, PTO; /* add user context as 1st arg */
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lwi r3, r1, PTO+PT_R3; /* restore saved r3, r4 registers */
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lwi r4, r1, PTO+PT_R4;
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bri ret_from_trap /* fall through will not work here due to align */
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@ -553,7 +546,6 @@ C_ENTRY(full_exception_trap):
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* I tested it but there is a fault */
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/* where the trap should return need -8 to adjust for rtsd r15, 8 */
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addik r15, r0, ret_from_exc - 8
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addik r5, r1, PTO /* parameter struct pt_regs * regs */
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mfs r6, resr
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nop
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mfs r7, rfsr; /* save FSR */
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@ -561,7 +553,7 @@ C_ENTRY(full_exception_trap):
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mts rfsr, r0; /* Clear sticky fsr */
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nop
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rted r0, full_exception
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nop
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addik r5, r1, PTO /* parameter struct pt_regs * regs */
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/*
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* Unaligned data trap.
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@ -623,13 +615,12 @@ C_ENTRY(page_fault_data_trap):
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tovirt(r1,r1)
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/* where the trap should return need -8 to adjust for rtsd r15, 8 */
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addik r15, r0, ret_from_exc-8
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addik r5, r1, PTO /* parameter struct pt_regs * regs */
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mfs r6, rear /* parameter unsigned long address */
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nop
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mfs r7, resr /* parameter unsigned long error_code */
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nop
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rted r0, do_page_fault
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nop
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addik r5, r1, PTO /* parameter struct pt_regs * regs */
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C_ENTRY(page_fault_instr_trap):
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SAVE_STATE /* Save registers.*/
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@ -638,11 +629,11 @@ C_ENTRY(page_fault_instr_trap):
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tovirt(r1,r1)
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/* where the trap should return need -8 to adjust for rtsd r15, 8 */
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addik r15, r0, ret_from_exc-8
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addik r5, r1, PTO /* parameter struct pt_regs * regs */
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mfs r6, rear /* parameter unsigned long address */
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nop
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rted r0, do_page_fault
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ori r7, r0, 0 /* parameter unsigned long error_code */
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rted r0, do_page_fault
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addik r5, r1, PTO /* parameter struct pt_regs * regs */
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/* Entry point used to return from an exception. */
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C_ENTRY(ret_from_exc):
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