1 files changed, 140 insertions, 171 deletions

diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S
index 7e6236073397..90bfc1dbc13d 100644
--- a/arch/xtensa/kernel/entry.S
+++ b/arch/xtensa/kernel/entry.S
@@ -112,8 +112,8 @@ ENTRY(user_exception)
 
         /* Save a2, a3, and depc, restore excsave_1 and set SP. */
 
-        xsr     a3, EXCSAVE_1
-        rsr     a0, DEPC
+        xsr     a3, excsave1
+        rsr     a0, depc
         s32i    a1, a2, PT_AREG1
         s32i    a0, a2, PT_AREG2
         s32i    a3, a2, PT_AREG3
@@ -125,16 +125,16 @@ _user_exception:
         /* Save SAR and turn off single stepping */
 
         movi    a2, 0
-        rsr     a3, SAR
-        xsr     a2, ICOUNTLEVEL
+        rsr     a3, sar
+        xsr     a2, icountlevel
         s32i    a3, a1, PT_SAR
         s32i    a2, a1, PT_ICOUNTLEVEL
 
         /* Rotate ws so that the current windowbase is at bit0. */
         /* Assume ws = xxwww1yyyy. Rotate ws right, so that a2 = yyyyxxwww1 */
 
-        rsr     a2, WINDOWBASE
-        rsr     a3, WINDOWSTART
+        rsr     a2, windowbase
+        rsr     a3, windowstart
         ssr     a2
         s32i    a2, a1, PT_WINDOWBASE
         s32i    a3, a1, PT_WINDOWSTART
@@ -205,12 +205,12 @@ _user_exception:
 
         /* WINDOWBASE still in SAR! */
 
-        rsr     a2, SAR                 # original WINDOWBASE
+        rsr     a2, sar                 # original WINDOWBASE
         movi    a3, 1
         ssl     a2
         sll     a3, a3
-        wsr     a3, WINDOWSTART         # set corresponding WINDOWSTART bit
-        wsr     a2, WINDOWBASE          # and WINDOWSTART
+        wsr     a3, windowstart         # set corresponding WINDOWSTART bit
+        wsr     a2, windowbase          # and WINDOWSTART
         rsync
 
         /* We are back to the original stack pointer (a1) */
@@ -252,8 +252,8 @@ ENTRY(kernel_exception)
 
         /* Save a0, a2, a3, DEPC and set SP. */
 
-        xsr     a3, EXCSAVE_1           # restore a3, excsave_1
-        rsr     a0, DEPC                # get a2
+        xsr     a3, excsave1            # restore a3, excsave_1
+        rsr     a0, depc                # get a2
         s32i    a1, a2, PT_AREG1
         s32i    a0, a2, PT_AREG2
         s32i    a3, a2, PT_AREG3
@@ -265,16 +265,16 @@ _kernel_exception:
         /* Save SAR and turn off single stepping */
 
         movi    a2, 0
-        rsr     a3, SAR
-        xsr     a2, ICOUNTLEVEL
+        rsr     a3, sar
+        xsr     a2, icountlevel
         s32i    a3, a1, PT_SAR
         s32i    a2, a1, PT_ICOUNTLEVEL
 
         /* Rotate ws so that the current windowbase is at bit0. */
         /* Assume ws = xxwww1yyyy. Rotate ws right, so that a2 = yyyyxxwww1 */
 
-        rsr     a2, WINDOWBASE          # don't need to save these, we only
-        rsr     a3, WINDOWSTART         # need shifted windowstart: windowmask
+        rsr     a2, windowbase          # don't need to save these, we only
+        rsr     a3, windowstart         # need shifted windowstart: windowmask
         ssr     a2
         slli    a2, a3, 32-WSBITS
         src     a2, a3, a2
@@ -323,24 +323,24 @@ common_exception:
 
         /* Save some registers, disable loops and clear the syscall flag. */
 
-        rsr     a2, DEBUGCAUSE
-        rsr     a3, EPC_1
+        rsr     a2, debugcause
+        rsr     a3, epc1
         s32i    a2, a1, PT_DEBUGCAUSE
         s32i    a3, a1, PT_PC
 
         movi    a2, -1
-        rsr     a3, EXCVADDR
+        rsr     a3, excvaddr
         s32i    a2, a1, PT_SYSCALL
         movi    a2, 0
         s32i    a3, a1, PT_EXCVADDR
-        xsr     a2, LCOUNT
+        xsr     a2, lcount
         s32i    a2, a1, PT_LCOUNT
 
         /* It is now save to restore the EXC_TABLE_FIXUP variable. */
 
-        rsr     a0, EXCCAUSE
+        rsr     a0, exccause
         movi    a3, 0
-        rsr     a2, EXCSAVE_1
+        rsr     a2, excsave1
         s32i    a0, a1, PT_EXCCAUSE
         s32i    a3, a2, EXC_TABLE_FIXUP
 
@@ -352,22 +352,22 @@ common_exception:
          *     (interrupts disabled) and if this exception is not an interrupt.
          */
 
-        rsr     a3, PS
+        rsr     a3, ps
         addi    a0, a0, -4
         movi    a2, 1
         extui   a3, a3, 0, 1            # a3 = PS.INTLEVEL[0]
         moveqz  a3, a2, a0              # a3 = 1 iff interrupt exception
         movi    a2, 1 << PS_WOE_BIT
         or      a3, a3, a2
-        rsr     a0, EXCCAUSE
-        xsr     a3, PS
+        rsr     a0, exccause
+        xsr     a3, ps
 
         s32i    a3, a1, PT_PS           # save ps
 
-        /* Save LBEG, LEND */
+        /* Save lbeg, lend */
 
-        rsr     a2, LBEG
-        rsr     a3, LEND
+        rsr     a2, lbeg
+        rsr     a3, lend
         s32i    a2, a1, PT_LBEG
         s32i    a3, a1, PT_LEND
 
@@ -432,7 +432,7 @@ common_exception_return:
 
         load_xtregs_opt a1 a2 a4 a5 a6 a7 PT_XTREGS_OPT
 
-        wsr     a3, PS          /* disable interrupts */
+        wsr     a3, ps          /* disable interrupts */
 
         _bbci.l a3, PS_UM_BIT, kernel_exception_exit
 
@@ -444,12 +444,12 @@ user_exception_exit:
 
         l32i    a2, a1, PT_WINDOWBASE
         l32i    a3, a1, PT_WINDOWSTART
-        wsr     a1, DEPC                # use DEPC as temp storage
-        wsr     a3, WINDOWSTART         # restore WINDOWSTART
+        wsr     a1, depc                # use DEPC as temp storage
+        wsr     a3, windowstart         # restore WINDOWSTART
         ssr     a2                      # preserve user's WB in the SAR
-        wsr     a2, WINDOWBASE          # switch to user's saved WB
+        wsr     a2, windowbase          # switch to user's saved WB
         rsync
-        rsr     a1, DEPC                # restore stack pointer
+        rsr     a1, depc                # restore stack pointer
         l32i    a2, a1, PT_WMASK        # register frames saved (in bits 4...9)
         rotw    -1                      # we restore a4..a7
         _bltui  a6, 16, 1f              # only have to restore current window?
@@ -475,8 +475,8 @@ user_exception_exit:
 
         /* Clear unrestored registers (don't leak anything to user-land */
 
-1:      rsr     a0, WINDOWBASE
-        rsr     a3, SAR
+1:      rsr     a0, windowbase
+        rsr     a3, sar
         sub     a3, a0, a3
         beqz    a3, 2f
         extui   a3, a3, 0, WBBITS
@@ -556,7 +556,7 @@ kernel_exception_exit:
 
         /* Test WINDOWSTART now. If spilled, do the movsp */
 
-        rsr     a3, WINDOWSTART
+        rsr     a3, windowstart
         addi    a0, a3, -1
         and     a3, a3, a0
         _bnez   a3, common_exception_exit
@@ -604,24 +604,24 @@ common_exception_exit:
 
 1:      l32i    a2, a1, PT_PC
         l32i    a3, a1, PT_SAR
-        wsr     a2, EPC_1
-        wsr     a3, SAR
+        wsr     a2, epc1
+        wsr     a3, sar
 
         /* Restore LBEG, LEND, LCOUNT */
 
         l32i    a2, a1, PT_LBEG
         l32i    a3, a1, PT_LEND
-        wsr     a2, LBEG
+        wsr     a2, lbeg
         l32i    a2, a1, PT_LCOUNT
-        wsr     a3, LEND
-        wsr     a2, LCOUNT
+        wsr     a3, lend
+        wsr     a2, lcount
 
         /* We control single stepping through the ICOUNTLEVEL register. */
 
         l32i    a2, a1, PT_ICOUNTLEVEL
         movi    a3, -2
-        wsr     a2, ICOUNTLEVEL
-        wsr     a3, ICOUNT
+        wsr     a2, icountlevel
+        wsr     a3, icount
 
         /* Check if it was double exception. */
 
@@ -636,7 +636,7 @@ common_exception_exit:
         l32i    a1, a1, PT_AREG1
         rfe
 
-1:      wsr     a0, DEPC
+1:      wsr     a0, depc
         l32i    a0, a1, PT_AREG0
         l32i    a1, a1, PT_AREG1
         rfde
@@ -651,25 +651,25 @@ common_exception_exit:
 
 ENTRY(debug_exception)
 
-        rsr     a0, EPS + XCHAL_DEBUGLEVEL
+        rsr     a0, SREG_EPS + XCHAL_DEBUGLEVEL
         bbsi.l  a0, PS_EXCM_BIT, 1f     # exception mode
 
-        /* Set EPC_1 and EXCCAUSE */
+        /* Set EPC1 and EXCCAUSE */
 
-        wsr     a2, DEPC                # save a2 temporarily
-        rsr     a2, EPC + XCHAL_DEBUGLEVEL
-        wsr     a2, EPC_1
+        wsr     a2, depc                # save a2 temporarily
+        rsr     a2, SREG_EPC + XCHAL_DEBUGLEVEL
+        wsr     a2, epc1
 
         movi    a2, EXCCAUSE_MAPPED_DEBUG
-        wsr     a2, EXCCAUSE
+        wsr     a2, exccause
 
         /* Restore PS to the value before the debug exc but with PS.EXCM set.*/
 
         movi    a2, 1 << PS_EXCM_BIT
         or      a2, a0, a2
         movi    a0, debug_exception     # restore a3, debug jump vector
-        wsr     a2, PS
-        xsr     a0, EXCSAVE + XCHAL_DEBUGLEVEL
+        wsr     a2, ps
+        xsr     a0, SREG_EXCSAVE + XCHAL_DEBUGLEVEL
 
         /* Switch to kernel/user stack, restore jump vector, and save a0 */
 
@@ -680,19 +680,19 @@ ENTRY(debug_exception)
         movi    a0, 0
         s32i    a1, a2, PT_AREG1
         s32i    a0, a2, PT_DEPC         # mark it as a regular exception
-        xsr     a0, DEPC
+        xsr     a0, depc
         s32i    a3, a2, PT_AREG3
         s32i    a0, a2, PT_AREG2
         mov     a1, a2
         j       _kernel_exception
 
-2:      rsr     a2, EXCSAVE_1
+2:      rsr     a2, excsave1
         l32i    a2, a2, EXC_TABLE_KSTK  # load kernel stack pointer
         s32i    a0, a2, PT_AREG0
         movi    a0, 0
         s32i    a1, a2, PT_AREG1
         s32i    a0, a2, PT_DEPC
-        xsr     a0, DEPC
+        xsr     a0, depc
         s32i    a3, a2, PT_AREG3
         s32i    a0, a2, PT_AREG2
         mov     a1, a2
@@ -732,12 +732,12 @@ ENTRY(unrecoverable_exception)
         movi    a0, 1
         movi    a1, 0
 
-        wsr     a0, WINDOWSTART
-        wsr     a1, WINDOWBASE
+        wsr     a0, windowstart
+        wsr     a1, windowbase
         rsync
 
         movi    a1, (1 << PS_WOE_BIT) | 1
-        wsr     a1, PS
+        wsr     a1, ps
         rsync
 
         movi    a1, init_task
@@ -793,7 +793,7 @@ ENTRY(fast_alloca)
         l32i    a0, a2, PT_DEPC
         _bgeui  a0, VALID_DOUBLE_EXCEPTION_ADDRESS, .Lunhandled_double
 
-        rsr     a0, DEPC                # get a2
+        rsr     a0, depc                # get a2
         s32i    a4, a2, PT_AREG4        # save a4 and
         s32i    a0, a2, PT_AREG2        # a2 to stack
 
@@ -804,8 +804,8 @@ ENTRY(fast_alloca)
 
         /* Restore a3, excsave_1 */
 
-        xsr     a3, EXCSAVE_1           # make sure excsave_1 is valid for dbl.
-        rsr     a4, EPC_1               # get exception address
+        xsr     a3, excsave1            # make sure excsave_1 is valid for dbl.
+        rsr     a4, epc1                # get exception address
         s32i    a3, a2, PT_AREG3        # save a3 to stack
 
 #ifdef ALLOCA_EXCEPTION_IN_IRAM
@@ -820,7 +820,7 @@ ENTRY(fast_alloca)
         jx      a3
 
 .Lunhandled_double:
-        wsr     a0, EXCSAVE_1
+        wsr     a0, excsave1
         movi    a0, unrecoverable_exception
         callx0  a0
 
@@ -852,7 +852,7 @@ ENTRY(fast_alloca)
 #endif
         addi    a4, a4, 3               # step over movsp
         _EXTUI_MOVSP_DST(a0)            # extract destination register
-        wsr     a4, EPC_1               # save new epc_1
+        wsr     a4, epc1                # save new epc_1
 
         _bnei   a0, 1, 1f               # no 'movsp a1, ax': jump
 
@@ -953,14 +953,14 @@ ENTRY(fast_syscall_kernel)
 
         /* Skip syscall. */
 
-        rsr     a0, EPC_1
+        rsr     a0, epc1
         addi    a0, a0, 3
-        wsr     a0, EPC_1
+        wsr     a0, epc1
 
         l32i    a0, a2, PT_DEPC
         bgeui   a0, VALID_DOUBLE_EXCEPTION_ADDRESS, fast_syscall_unrecoverable
 
-        rsr     a0, DEPC                        # get syscall-nr
+        rsr     a0, depc                        # get syscall-nr
         _beqz   a0, fast_syscall_spill_registers
         _beqi   a0, __NR_xtensa, fast_syscall_xtensa
 
@@ -970,14 +970,14 @@ ENTRY(fast_syscall_user)
 
         /* Skip syscall. */
 
-        rsr     a0, EPC_1
+        rsr     a0, epc1
         addi    a0, a0, 3
-        wsr     a0, EPC_1
+        wsr     a0, epc1
 
         l32i    a0, a2, PT_DEPC
         bgeui   a0, VALID_DOUBLE_EXCEPTION_ADDRESS, fast_syscall_unrecoverable
 
-        rsr     a0, DEPC                        # get syscall-nr
+        rsr     a0, depc                        # get syscall-nr
         _beqz   a0, fast_syscall_spill_registers
         _beqi   a0, __NR_xtensa, fast_syscall_xtensa
 
@@ -988,10 +988,10 @@ ENTRY(fast_syscall_unrecoverable)
         /* Restore all states. */
 
         l32i    a0, a2, PT_AREG0        # restore a0
-        xsr     a2, DEPC                # restore a2, depc
-        rsr     a3, EXCSAVE_1
+        xsr     a2, depc                # restore a2, depc
+        rsr     a3, excsave1
 
-        wsr     a0, EXCSAVE_1
+        wsr     a0, excsave1
         movi    a0, unrecoverable_exception
         callx0  a0
 
@@ -1047,7 +1047,7 @@ ENTRY(fast_syscall_unrecoverable)
 
 ENTRY(fast_syscall_xtensa)
 
-        xsr     a3, EXCSAVE_1           # restore a3, excsave1
+        xsr     a3, excsave1            # restore a3, excsave1
 
         s32i    a7, a2, PT_AREG7        # we need an additional register
         movi    a7, 4                   # sizeof(unsigned int)
@@ -1124,13 +1124,13 @@ ENTRY(fast_syscall_spill_registers)
 
         movi    a0, fast_syscall_spill_registers_fixup
         s32i    a0, a3, EXC_TABLE_FIXUP
-        rsr     a0, WINDOWBASE
+        rsr     a0, windowbase
         s32i    a0, a3, EXC_TABLE_PARAM
 
         /* Save a3 and SAR on stack. */
 
-        rsr     a0, SAR
-        xsr     a3, EXCSAVE_1           # restore a3 and excsave_1
+        rsr     a0, sar
+        xsr     a3, excsave1            # restore a3 and excsave_1
         s32i    a3, a2, PT_AREG3
         s32i    a4, a2, PT_AREG4
         s32i    a0, a2, PT_AREG5        # store SAR to PT_AREG5
@@ -1148,7 +1148,7 @@ ENTRY(fast_syscall_spill_registers)
         l32i    a3, a2, PT_AREG5
         l32i    a4, a2, PT_AREG4
         l32i    a0, a2, PT_AREG0
-        wsr     a3, SAR
+        wsr     a3, sar
         l32i    a3, a2, PT_AREG3
 
         /* Restore clobbered registers. */
@@ -1173,8 +1173,8 @@ ENTRY(fast_syscall_spill_registers)
 
 fast_syscall_spill_registers_fixup:
 
-        rsr     a2, WINDOWBASE  # get current windowbase (a2 is saved)
-        xsr     a0, DEPC        # restore depc and a0
+        rsr     a2, windowbase  # get current windowbase (a2 is saved)
+        xsr     a0, depc        # restore depc and a0
         ssl     a2              # set shift (32 - WB)
 
         /* We need to make sure the current registers (a0-a3) are preserved.
@@ -1182,12 +1182,12 @@ fast_syscall_spill_registers_fixup:
          * in WS, so that the exception handlers save them to the task stack.
          */
 
-        rsr     a3, EXCSAVE_1   # get spill-mask
+        rsr     a3, excsave1    # get spill-mask
         slli    a2, a3, 1       # shift left by one
 
         slli    a3, a2, 32-WSBITS
         src     a2, a2, a3      # a1 = xxwww1yyxxxwww1yy......
-        wsr     a2, WINDOWSTART # set corrected windowstart
+        wsr     a2, windowstart # set corrected windowstart
 
         movi    a3, exc_table
         l32i    a2, a3, EXC_TABLE_DOUBLE_SAVE   # restore a2
@@ -1201,7 +1201,7 @@ fast_syscall_spill_registers_fixup:
          * excsave_1:   a3
          */
 
-        wsr     a3, WINDOWBASE
+        wsr     a3, windowbase
         rsync
 
         /* We are now in the original frame when we entered _spill_registers:
@@ -1227,7 +1227,7 @@ fast_syscall_spill_registers_fixup:
         /* Jump to the exception handler. */
 
         movi    a3, exc_table
-        rsr     a0, EXCCAUSE
+        rsr     a0, exccause
         addx4   a0, a0, a3                      # find entry in table
         l32i    a0, a0, EXC_TABLE_FAST_USER     # load handler
         jx      a0
@@ -1236,28 +1236,28 @@ fast_syscall_spill_registers_fixup_return:
 
         /* When we return here, all registers have been restored (a2: DEPC) */
 
-        wsr     a2, DEPC                # exception address
+        wsr     a2, depc                # exception address
 
         /* Restore fixup handler. */
 
-        xsr     a3, EXCSAVE_1
+        xsr     a3, excsave1
         movi    a2, fast_syscall_spill_registers_fixup
         s32i    a2, a3, EXC_TABLE_FIXUP
-        rsr     a2, WINDOWBASE
+        rsr     a2, windowbase
         s32i    a2, a3, EXC_TABLE_PARAM
         l32i    a2, a3, EXC_TABLE_KSTK
 
         /* Load WB at the time the exception occurred. */
 
-        rsr     a3, SAR                 # WB is still in SAR
+        rsr     a3, sar                 # WB is still in SAR
         neg     a3, a3
-        wsr     a3, WINDOWBASE
+        wsr     a3, windowbase
         rsync
 
         /* Restore a3 and return. */
 
         movi    a3, exc_table
-        xsr     a3, EXCSAVE_1
+        xsr     a3, excsave1
 
         rfde
 
@@ -1283,8 +1283,8 @@ ENTRY(_spill_registers)
          * Rotate ws right so that a4 = yyxxxwww1.
          */
 
-        rsr     a4, WINDOWBASE
-        rsr     a3, WINDOWSTART         # a3 = xxxwww1yy
+        rsr     a4, windowbase
+        rsr     a3, windowstart         # a3 = xxxwww1yy
         ssr     a4                      # holds WB
         slli    a4, a3, WSBITS
         or      a3, a3, a4              # a3 = xxxwww1yyxxxwww1yy
@@ -1302,7 +1302,7 @@ ENTRY(_spill_registers)
 
         /* Skip empty frames - get 'oldest' WINDOWSTART-bit. */
 
-        wsr     a3, WINDOWSTART         # save shifted windowstart
+        wsr     a3, windowstart         # save shifted windowstart
         neg     a4, a3
         and     a3, a4, a3              # first bit set from right: 000010000
 
@@ -1311,12 +1311,12 @@ ENTRY(_spill_registers)
         sub     a4, a3, a4              # WSBITS-a4:number of 0-bits from right
         ssr     a4                      # save in SAR for later.
 
-        rsr     a3, WINDOWBASE
+        rsr     a3, windowbase
         add     a3, a3, a4
-        wsr     a3, WINDOWBASE
+        wsr     a3, windowbase
         rsync
 
-        rsr     a3, WINDOWSTART
+        rsr     a3, windowstart
         srl     a3, a3                  # shift windowstart
 
         /* WB is now just one frame below the oldest frame in the register
@@ -1364,11 +1364,11 @@ ENTRY(_spill_registers)
 .Lexit: /* Done. Do the final rotation, set WS, and return. */
 
         rotw    1
-        rsr     a3, WINDOWBASE
+        rsr     a3, windowbase
         ssl     a3
         movi    a3, 1
         sll     a3, a3
-        wsr     a3, WINDOWSTART
+        wsr     a3, windowstart
         ret
 
 .Lc4:   s32e    a4, a9, -16
@@ -1429,7 +1429,7 @@ ENTRY(_spill_registers)
          * however, this condition is unrecoverable in kernel space.
          */
 
-        rsr     a0, PS
+        rsr     a0, ps
         _bbci.l a0, PS_UM_BIT, 1f
 
         /* User space: Setup a dummy frame and kill application.
@@ -1439,18 +1439,18 @@ ENTRY(_spill_registers)
         movi    a0, 1
         movi    a1, 0
 
-        wsr     a0, WINDOWSTART
-        wsr     a1, WINDOWBASE
+        wsr     a0, windowstart
+        wsr     a1, windowbase
         rsync
 
         movi    a0, 0
 
         movi    a3, exc_table
         l32i    a1, a3, EXC_TABLE_KSTK
-        wsr     a3, EXCSAVE_1
+        wsr     a3, excsave1
 
         movi    a4, (1 << PS_WOE_BIT) | 1
-        wsr     a4, PS
+        wsr     a4, ps
         rsync
 
         movi    a6, SIGSEGV
@@ -1459,7 +1459,7 @@ ENTRY(_spill_registers)
 
 1:      /* Kernel space: PANIC! */
 
-        wsr     a0, EXCSAVE_1
+        wsr     a0, excsave1
         movi    a0, unrecoverable_exception
         callx0  a0              # should not return
 1:      j       1b
@@ -1524,7 +1524,7 @@ ENTRY(fast_second_level_miss)
 
         /* We deliberately destroy a3 that holds the exception table. */
 
-8:      rsr     a3, EXCVADDR            # fault address
+8:      rsr     a3, excvaddr            # fault address
         _PGD_OFFSET(a0, a3, a1)
         l32i    a0, a0, 0               # read pmdval
         beqz    a0, 2f
@@ -1542,7 +1542,7 @@ ENTRY(fast_second_level_miss)
          * pteval = ((pmdval - PAGE_OFFSET) & PAGE_MASK) | PAGE_DIRECTORY
          */
 
-        movi    a1, -PAGE_OFFSET
+        movi    a1, (-PAGE_OFFSET) & 0xffffffff
         add     a0, a0, a1              # pmdval - PAGE_OFFSET
         extui   a1, a0, 0, PAGE_SHIFT   # ... & PAGE_MASK
         xor     a0, a0, a1
@@ -1561,7 +1561,7 @@ ENTRY(fast_second_level_miss)
          */
 
         extui   a3, a3, 28, 2           # addr. bit 28 and 29   0,1,2,3
-        rsr     a1, PTEVADDR
+        rsr     a1, ptevaddr
         addx2   a3, a3, a3              # ->                    0,3,6,9
         srli    a1, a1, PAGE_SHIFT
         extui   a3, a3, 2, 2            # ->                    0,0,1,2
@@ -1583,18 +1583,18 @@ ENTRY(fast_second_level_miss)
         l32i    a0, a2, PT_AREG0
         l32i    a1, a2, PT_AREG1
         l32i    a2, a2, PT_DEPC
-        xsr     a3, EXCSAVE_1
+        xsr     a3, excsave1
 
         bgeui   a2, VALID_DOUBLE_EXCEPTION_ADDRESS, 1f
 
         /* Restore excsave1 and return. */
 
-        rsr     a2, DEPC
+        rsr     a2, depc
         rfe
 
         /* Return from double exception. */
 
-1:      xsr     a2, DEPC
+1:      xsr     a2, depc
         esync
         rfde
 
@@ -1618,7 +1618,7 @@ ENTRY(fast_second_level_miss)
         /* Make sure the exception originated in the special functions */
 
         movi    a0, __tlbtemp_mapping_start
-        rsr     a3, EPC_1
+        rsr     a3, epc1
         bltu    a3, a0, 2f
         movi    a0, __tlbtemp_mapping_end
         bgeu    a3, a0, 2f
@@ -1626,7 +1626,7 @@ ENTRY(fast_second_level_miss)
         /* Check if excvaddr was in one of the TLBTEMP_BASE areas. */
 
         movi    a3, TLBTEMP_BASE_1
-        rsr     a0, EXCVADDR
+        rsr     a0, excvaddr
         bltu    a0, a3, 2f
 
         addi    a1, a0, -(2 << (DCACHE_ALIAS_ORDER + PAGE_SHIFT))
@@ -1635,7 +1635,7 @@ ENTRY(fast_second_level_miss)
         /* Check if we have to restore an ITLB mapping. */
 
         movi    a1, __tlbtemp_mapping_itlb
-        rsr     a3, EPC_1
+        rsr     a3, epc1
         sub     a3, a3, a1
 
         /* Calculate VPN */
@@ -1671,13 +1671,13 @@ ENTRY(fast_second_level_miss)
 2:      /* Invalid PGD, default exception handling */
 
         movi    a3, exc_table
-        rsr     a1, DEPC
-        xsr     a3, EXCSAVE_1
+        rsr     a1, depc
+        xsr     a3, excsave1
         s32i    a1, a2, PT_AREG2
         s32i    a3, a2, PT_AREG3
         mov     a1, a2
 
-        rsr     a2, PS
+        rsr     a2, ps
         bbsi.l  a2, PS_UM_BIT, 1f
         j       _kernel_exception
 1:      j       _user_exception
@@ -1712,7 +1712,7 @@ ENTRY(fast_store_prohibited)
         l32i    a0, a1, TASK_MM         # tsk->mm
         beqz    a0, 9f
 
-8:      rsr     a1, EXCVADDR            # fault address
+8:      rsr     a1, excvaddr            # fault address
         _PGD_OFFSET(a0, a1, a4)
         l32i    a0, a0, 0
         beqz    a0, 2f
@@ -1725,7 +1725,7 @@ ENTRY(fast_store_prohibited)
 
         movi    a1, _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_HW_WRITE
         or      a4, a4, a1
-        rsr     a1, EXCVADDR
+        rsr     a1, excvaddr
         s32i    a4, a0, 0
 
         /* We need to flush the cache if we have page coloring. */
@@ -1749,15 +1749,15 @@ ENTRY(fast_store_prohibited)
 
         /* Restore excsave1 and a3. */
 
-        xsr     a3, EXCSAVE_1
+        xsr     a3, excsave1
         bgeui   a2, VALID_DOUBLE_EXCEPTION_ADDRESS, 1f
 
-        rsr     a2, DEPC
+        rsr     a2, depc
         rfe
 
         /* Double exception. Restore FIXUP handler and return. */
 
-1:      xsr     a2, DEPC
+1:      xsr     a2, depc
         esync
         rfde
 
@@ -1766,14 +1766,14 @@ ENTRY(fast_store_prohibited)
 
 2:      /* If there was a problem, handle fault in C */
 
-        rsr     a4, DEPC        # still holds a2
-        xsr     a3, EXCSAVE_1
+        rsr     a4, depc        # still holds a2
+        xsr     a3, excsave1
         s32i    a4, a2, PT_AREG2
         s32i    a3, a2, PT_AREG3
         l32i    a4, a2, PT_AREG4
         mov     a1, a2
 
-        rsr     a2, PS
+        rsr     a2, ps
         bbsi.l  a2, PS_UM_BIT, 1f
         j       _kernel_exception
 1:      j       _user_exception
@@ -1833,50 +1833,6 @@ ENTRY(system_call)
 
 
 /*
- * Create a kernel thread
- *
- * int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
- * a2                    a2                 a3             a4
- */
-
-ENTRY(kernel_thread)
-        entry   a1, 16
-
-        mov     a5, a2                  # preserve fn over syscall
-        mov     a7, a3                  # preserve args over syscall
-
-        movi    a3, _CLONE_VM | _CLONE_UNTRACED
-        movi    a2, __NR_clone
-        or      a6, a4, a3              # arg0: flags
-        mov     a3, a1                  # arg1: sp
-        syscall
-
-        beq     a3, a1, 1f              # branch if parent
-        mov     a6, a7                  # args
-        callx4  a5                      # fn(args)
-
-        movi    a2, __NR_exit
-        syscall                         # return value of fn(args) still in a6
-
-1:      retw
-
-/*
- * Do a system call from kernel instead of calling sys_execve, so we end up
- * with proper pt_regs.
- *
- * int kernel_execve(const char *fname, char *const argv[], charg *const envp[])
- * a2                        a2               a3                  a4
- */
-
-ENTRY(kernel_execve)
-        entry   a1, 16
-        mov     a6, a2                  # arg0 is in a6
-        movi    a2, __NR_execve
-        syscall
-
-        retw
-
-/*
  * Task switch.
  *
  * struct task*  _switch_to (struct task* prev, struct task* next)
@@ -1901,8 +1857,8 @@ ENTRY(_switch_to)
         /* Disable ints while we manipulate the stack pointer. */
 
         movi    a14, (1 << PS_EXCM_BIT) | LOCKLEVEL
-        xsr     a14, PS
-        rsr     a3, EXCSAVE_1
+        xsr     a14, ps
+        rsr     a3, excsave1
         rsync
         s32i    a3, a3, EXC_TABLE_FIXUP /* enter critical section */
 
@@ -1910,7 +1866,7 @@ ENTRY(_switch_to)
 
 #if (XTENSA_HAVE_COPROCESSORS || XTENSA_HAVE_IO_PORTS)
         l32i    a3, a5, THREAD_CPENABLE
-        xsr     a3, CPENABLE
+        xsr     a3, cpenable
         s32i    a3, a4, THREAD_CPENABLE
 #endif
 
@@ -1924,7 +1880,7 @@ ENTRY(_switch_to)
          *       we return from kernel space.
          */
 
-        rsr     a3, EXCSAVE_1           # exc_table
+        rsr     a3, excsave1            # exc_table
         movi    a6, 0
         addi    a7, a5, PT_REGS_OFFSET
         s32i    a6, a3, EXC_TABLE_FIXUP
@@ -1937,7 +1893,7 @@ ENTRY(_switch_to)
 
         load_xtregs_user a5 a6 a8 a9 a10 a11 THREAD_XTREGS_USER
 
-        wsr     a14, PS
+        wsr     a14, ps
         mov     a2, a12                 # return 'prev'
         rsync
 
@@ -1958,3 +1914,16 @@ ENTRY(ret_from_fork)
 
         j       common_exception_return
 
+/*
+ * Kernel thread creation helper
+ * On entry, set up by copy_thread: a2 = thread_fn, a3 = thread_fn arg
+ *           left from _switch_to: a6 = prev
+ */
+ENTRY(ret_from_kernel_thread)
+
+        call4   schedule_tail
+        mov     a6, a3
+        callx4  a2
+        j       common_exception_return
+
+ENDPROC(ret_from_kernel_thread)