Changes in kernel/arch/mips32/src/start.S [0c334805:a35b458] in mainline

File:

• kernel/arch/mips32/src/start.S (modified) (13 diffs)

kernel/arch/mips32/src/start.S

@@ -89 +89 @@
         sw $s7, ISTATE_OFFSET_S7(\r)
         sw $s8, ISTATE_OFFSET_S8(\r)
-        
+
         mflo $at
         sw $at, ISTATE_OFFSET_LO(\r)
         mfhi $at
         sw $at, ISTATE_OFFSET_HI(\r)
-        
+
         sw $gp, ISTATE_OFFSET_GP(\r)
         sw $ra, ISTATE_OFFSET_RA(\r)
         sw $k0, ISTATE_OFFSET_KT0(\r)
         sw $k1, ISTATE_OFFSET_KT1(\r)
-        
+
         mfc0 $t0, $status
         mfc0 $t1, $epc
-        
+
         /* save only KSU, EXL, ERL, IE */
         and $t2, $t0, REG_SAVE_MASK
-        
+
         /* clear KSU, EXL, ERL, IE */
         li $t3, ~(REG_SAVE_MASK)
         and $t0, $t0, $t3
-        
+
         sw $t2, ISTATE_OFFSET_STATUS(\r)
         sw $t1, ISTATE_OFFSET_EPC(\r)
@@ -122 +122 @@
         mfc0 $t0, $status
         lw $t1, ISTATE_OFFSET_STATUS(\r)
-        
+
         /* mask UM, EXL, ERL, IE */
         li $t2, ~REG_SAVE_MASK
         and $t0, $t0, $t2
-        
+
         /* copy UM, EXL, ERL, IE from saved status */
         or $t0, $t0, $t1
         mtc0 $t0, $status
-        
+
         lw $v0, ISTATE_OFFSET_V0(\r)
         lw $v1, ISTATE_OFFSET_V1(\r)
@@ -147 +147 @@
         lw $t8, ISTATE_OFFSET_T8(\r)
         lw $t9, ISTATE_OFFSET_T9(\r)
-        
+
         lw $gp, ISTATE_OFFSET_GP(\r)
         lw $ra, ISTATE_OFFSET_RA(\r)
         lw $k1, ISTATE_OFFSET_KT1(\r)
-        
+
         lw $at, ISTATE_OFFSET_LO(\r)
         mtlo $at
         lw $at, ISTATE_OFFSET_HI(\r)
         mthi $at
-        
+
         lw $at, ISTATE_OFFSET_EPC(\r)
         mtc0 $at, $epc
-        
+
         lw $at, ISTATE_OFFSET_AT(\r)
         lw $sp, ISTATE_OFFSET_SP(\r)
@@ -172 +172 @@
         mfc0 $k0, $status
         andi $k0, 0x10
-        
+
         beq $k0, $0, 1f
         move $k0, $sp
-        
+
         /* move $k0 pointer to kernel stack */
         la $k0, supervisor_sp
-        
+
         /* move $k0 (supervisor_sp) */
         lw $k0, ($k0)
-        
+
         1:
 .endm
@@ -190 +190 @@
         lui $sp, %hi(end_stack)
         ori $sp, $sp, %lo(end_stack)
-        
+
         /* not sure about this, but might be needed for PIC code */
         lui $gp, 0x8000
-        
+
         /* $a1 contains physical address of bootinfo_t */
         jal mips32_pre_main
         addiu $sp, -ABI_STACK_FRAME
-        
+
         j main_bsp
         nop
@@ -219 +219 @@
 exception_handler:
         KERNEL_STACK_TO_K0
-        
+
         sub $k0, ISTATE_SIZE
         sw $sp, ISTATE_OFFSET_SP($k0)
         move $sp, $k0
-        
+
         mfc0 $k0, $cause
-        
+
         sra $k0, $k0, 0x2    /* cp0_exc_cause() part 1 */
         andi $k0, $k0, 0x1f  /* cp0_exc_cause() part 2 */
         sub $k0, 8           /* 8 = SYSCALL */
-        
+
         beqz $k0, syscall_shortcut
         add $k0, 8           /* revert $k0 back to correct exc number */
-        
+
         REGISTERS_STORE_AND_EXC_RESET $sp
-        
+
         move $a1, $sp
         move $a0, $k0
@@ -240 +240 @@
         addiu $sp, -ABI_STACK_FRAME
         addiu $sp, ABI_STACK_FRAME
-        
+
         REGISTERS_LOAD $sp
         /* the $sp is automatically restored to former value */
@@ -265 +265 @@
         sw $t3, ISTATE_OFFSET_EPC($sp)  /* save EPC */
         sw $k1, ISTATE_OFFSET_KT1($sp)  /* save $k1 not saved on context switch */
-        
+
         and $t4, $t2, REG_SAVE_MASK  /* save only KSU, EXL, ERL, IE */
         li $t5, ~(0x1f)
         and $t2, $t2, $t5  /* clear KSU, EXL, ERL */
         ori $t2, $t2, 0x1  /* set IE */
-        
+
         sw $t4, ISTATE_OFFSET_STATUS($sp)
         mtc0 $t2, $status
-        
+
         /*
          * Call the higher level system call handler.
@@ -280 +280 @@
         sw $t0, ISTATE_OFFSET_T0($sp)  /* save the 5th argument on the stack */
         sw $t1, ISTATE_OFFSET_T1($sp)  /* save the 6th argument on the stack */
-        
+
         jal syscall_handler
         sw $v0, ISTATE_OFFSET_V0($sp)  /* save the syscall number on the stack */
-        
+
         /* restore status */
         mfc0 $t2, $status
         lw $t3, ISTATE_OFFSET_STATUS($sp)
-        
+
         /*
          * Change back to EXL = 1 (from last exception), otherwise
@@ -297 +297 @@
         or $t2, $t2, $t3  /* copy saved UM, EXL, ERL, IE */
         mtc0 $t2, $status
-        
+
         /* restore epc + 4 */
         lw $t2, ISTATE_OFFSET_EPC($sp)
@@ -303 +303 @@
         addi $t2, $t2, 4
         mtc0 $t2, $epc
-        
+
         lw $sp, ISTATE_OFFSET_SP($sp)  /* restore $sp */
         eret
@@ -314 +314 @@
         sw $sp, ISTATE_OFFSET_SP($k0)
         move $sp, $k0
-        
+
         move $a0, $sp
         jal tlb_refill
         addiu $sp, -ABI_STACK_FRAME
         addiu $sp, ABI_STACK_FRAME
-        
+
         REGISTERS_LOAD $sp
         eret
@@ -330 +330 @@
         sw $sp, ISTATE_OFFSET_SP($k0)
         move $sp, $k0
-        
+
         move $a0, $sp
         jal cache_error
         addiu $sp, -ABI_STACK_FRAME
         addiu $sp, ABI_STACK_FRAME
-        
+
         REGISTERS_LOAD $sp
         eret