+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Copyright (C) 2004 Axis Communications AB
- *
- * Code for handling break 8, hardware breakpoint, single step, and serial
- * port exceptions for kernel debugging purposes.
- */
-
-#include <hwregs/intr_vect.h>
-
- ;; Exported functions.
- .globl kgdb_handle_exception
-
-kgdb_handle_exception:
-
-;; Create a register image of the caller.
-;;
-;; First of all, save the ACR on the stack since we need it for address calculations.
-;; We put it into the register struct later.
-
- subq 4, $sp
- move.d $acr, [$sp]
-
-;; Now we are free to use ACR all we want.
-;; If we were running this handler with interrupts on, we would have to be careful
-;; to save and restore CCS manually, but since we aren't we treat it like every other
-;; register.
-
- move.d reg, $acr
- move.d $r0, [$acr] ; Save R0 (start of register struct)
- addq 4, $acr
- move.d $r1, [$acr] ; Save R1
- addq 4, $acr
- move.d $r2, [$acr] ; Save R2
- addq 4, $acr
- move.d $r3, [$acr] ; Save R3
- addq 4, $acr
- move.d $r4, [$acr] ; Save R4
- addq 4, $acr
- move.d $r5, [$acr] ; Save R5
- addq 4, $acr
- move.d $r6, [$acr] ; Save R6
- addq 4, $acr
- move.d $r7, [$acr] ; Save R7
- addq 4, $acr
- move.d $r8, [$acr] ; Save R8
- addq 4, $acr
- move.d $r9, [$acr] ; Save R9
- addq 4, $acr
- move.d $r10, [$acr] ; Save R10
- addq 4, $acr
- move.d $r11, [$acr] ; Save R11
- addq 4, $acr
- move.d $r12, [$acr] ; Save R12
- addq 4, $acr
- move.d $r13, [$acr] ; Save R13
- addq 4, $acr
- move.d $sp, [$acr] ; Save SP (R14)
- addq 4, $acr
-
- ;; The ACR register is already saved on the stack, so pop it from there.
- move.d [$sp],$r0
- move.d $r0, [$acr]
- addq 4, $acr
-
- move $bz, [$acr]
- addq 1, $acr
- move $vr, [$acr]
- addq 1, $acr
- move $pid, [$acr]
- addq 4, $acr
- move $srs, [$acr]
- addq 1, $acr
- move $wz, [$acr]
- addq 2, $acr
- move $exs, [$acr]
- addq 4, $acr
- move $eda, [$acr]
- addq 4, $acr
- move $mof, [$acr]
- addq 4, $acr
- move $dz, [$acr]
- addq 4, $acr
- move $ebp, [$acr]
- addq 4, $acr
- move $erp, [$acr]
- addq 4, $acr
- move $srp, [$acr]
- addq 4, $acr
- move $nrp, [$acr]
- addq 4, $acr
- move $ccs, [$acr]
- addq 4, $acr
- move $usp, [$acr]
- addq 4, $acr
- move $spc, [$acr]
- addq 4, $acr
-
-;; Skip the pseudo-PC.
- addq 4, $acr
-
-;; Save the support registers in bank 0 - 3.
- clear.d $r1 ; Bank counter
- move.d sreg, $acr
-
-;; Bank 0
- move $r1, $srs
- nop
- nop
- nop
- move $s0, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s1, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s2, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s3, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s4, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s5, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s6, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s7, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s8, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s9, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s10, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s11, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s12, $r0
- move.d $r0, [$acr]
- addq 4, $acr
-
- ;; Nothing in S13 - S15, bank 0
- clear.d [$acr]
- addq 4, $acr
- clear.d [$acr]
- addq 4, $acr
- clear.d [$acr]
- addq 4, $acr
-
-;; Bank 1 and bank 2 have the same layout, hence the loop.
- addq 1, $r1
-1:
- move $r1, $srs
- nop
- nop
- nop
- move $s0, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s1, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s2, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s3, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s4, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s5, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s6, $r0
- move.d $r0, [$acr]
- addq 4, $acr
-
- ;; Nothing in S7 - S15, bank 1 and 2
- clear.d [$acr]
- addq 4, $acr
- clear.d [$acr]
- addq 4, $acr
- clear.d [$acr]
- addq 4, $acr
- clear.d [$acr]
- addq 4, $acr
- clear.d [$acr]
- addq 4, $acr
- clear.d [$acr]
- addq 4, $acr
- clear.d [$acr]
- addq 4, $acr
- clear.d [$acr]
- addq 4, $acr
- clear.d [$acr]
- addq 4, $acr
-
- addq 1, $r1
- cmpq 3, $r1
- bne 1b
- nop
-
-;; Bank 3
- move $r1, $srs
- nop
- nop
- nop
- move $s0, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s1, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s2, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s3, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s4, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s5, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s6, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s7, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s8, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s9, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s10, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s11, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s12, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s13, $r0
- move.d $r0, [$acr]
- addq 4, $acr
- move $s14, $r0
- move.d $r0, [$acr]
- addq 4, $acr
-;; Nothing in S15, bank 3
- clear.d [$acr]
- addq 4, $acr
-
-;; Check what got us here: get IDX field of EXS.
- move $exs, $r10
- and.d 0xff00, $r10
- lsrq 8, $r10
-#if defined(CONFIG_ETRAX_KGDB_PORT0)
- cmp.d SER0_INTR_VECT, $r10 ; IRQ for serial port 0
- beq sigint
- nop
-#elif defined(CONFIG_ETRAX_KGDB_PORT1)
- cmp.d SER1_INTR_VECT, $r10 ; IRQ for serial port 1
- beq sigint
- nop
-#elif defined(CONFIG_ETRAX_KGDB_PORT2)
- cmp.d SER2_INTR_VECT, $r10 ; IRQ for serial port 2
- beq sigint
- nop
-#elif defined(CONFIG_ETRAX_KGDB_PORT3)
- cmp.d SER3_INTR_VECT, $r10 ; IRQ for serial port 3
- beq sigint
- nop
-#endif
-;; Multiple interrupt must be due to serial break.
- cmp.d 0x30, $r10 ; Multiple interrupt
- beq sigint
- nop
-;; Neither of those? Then it's a sigtrap.
- ba handle_comm
- moveq 5, $r10 ; Set SIGTRAP (delay slot)
-
-sigint:
- ;; Serial interrupt; get character
- jsr getDebugChar
- nop ; Delay slot
- cmp.b 3, $r10 ; \003 (Ctrl-C)?
- bne return ; No, get out of here
- nop
- moveq 2, $r10 ; Set SIGINT
-
-;;
-;; Handle the communication
-;;
-handle_comm:
- move.d internal_stack+1020, $sp ; Use the internal stack which grows upwards
- jsr handle_exception ; Interactive routine
- nop
-
-;;
-;; Return to the caller
-;;
-return:
-
-;; First of all, write the support registers.
- clear.d $r1 ; Bank counter
- move.d sreg, $acr
-
-;; Bank 0
- move $r1, $srs
- nop
- nop
- nop
- move.d [$acr], $r0
- move $r0, $s0
- addq 4, $acr
- move.d [$acr], $r0
- move $r0, $s1
- addq 4, $acr
- move.d [$acr], $r0
- move $r0, $s2
- addq 4, $acr
- move.d [$acr], $r0
- move $r0, $s3
- addq 4, $acr
- move.d [$acr], $r0
- move $r0, $s4
- addq 4, $acr
- move.d [$acr], $r0
- move $r0, $s5
- addq 4, $acr
-
-;; Nothing in S6 - S7, bank 0.
- addq 4, $acr
- addq 4, $acr
-
- move.d [$acr], $r0
- move $r0, $s8
- addq 4, $acr
- move.d [$acr], $r0
- move $r0, $s9
- addq 4, $acr
- move.d [$acr], $r0
- move $r0, $s10
- addq 4, $acr
- move.d [$acr], $r0
- move $r0, $s11
- addq 4, $acr
- move.d [$acr], $r0
- move $r0, $s12
- addq 4, $acr
-
-;; Nothing in S13 - S15, bank 0
- addq 4, $acr
- addq 4, $acr
- addq 4, $acr
-
-;; Bank 1 and bank 2 have the same layout, hence the loop.
- addq 1, $r1
-2:
- move $r1, $srs
- nop
- nop
- nop
- move.d [$acr], $r0
- move $r0, $s0
- addq 4, $acr
- move.d [$acr], $r0
- move $r0, $s1
- addq 4, $acr
- move.d [$acr], $r0
- move $r0, $s2
- addq 4, $acr
-
-;; S3 (MM_CAUSE) is read-only.
- addq 4, $acr
-
- move.d [$acr], $r0
- move $r0, $s4
- addq 4, $acr
-
-;; FIXME: Actually write S5/S6? (Affects MM_CAUSE.)
- addq 4, $acr
- addq 4, $acr
-
-;; Nothing in S7 - S15, bank 1 and 2
- addq 4, $acr
- addq 4, $acr
- addq 4, $acr
- addq 4, $acr
- addq 4, $acr
- addq 4, $acr
- addq 4, $acr
- addq 4, $acr
- addq 4, $acr
-
- addq 1, $r1
- cmpq 3, $r1
- bne 2b
- nop
-
-;; Bank 3
- move $r1, $srs
- nop
- nop
- nop
- move.d [$acr], $r0
- move $r0, $s0
- addq 4, $acr
- move.d [$acr], $r0
- move $r0, $s1
- addq 4, $acr
- move.d [$acr], $r0
- move $r0, $s2
- addq 4, $acr
- move.d [$acr], $r0
- move $r0, $s3
- addq 4, $acr
- move.d [$acr], $r0
- move $r0, $s4
- addq 4, $acr
- move.d [$acr], $r0
- move $r0, $s5
- addq 4, $acr
- move.d [$acr], $r0
- move $r0, $s6
- addq 4, $acr
- move.d [$acr], $r0
- move $r0, $s7
- addq 4, $acr
- move.d [$acr], $r0
- move $r0, $s8
- addq 4, $acr
- move.d [$acr], $r0
- move $r0, $s9
- addq 4, $acr
- move.d [$acr], $r0
- move $r0, $s10
- addq 4, $acr
- move.d [$acr], $r0
- move $r0, $s11
- addq 4, $acr
- move.d [$acr], $r0
- move $r0, $s12
- addq 4, $acr
- move.d [$acr], $r0
- move $r0, $s13
- addq 4, $acr
- move.d [$acr], $r0
- move $r0, $s14
- addq 4, $acr
-
-;; Nothing in S15, bank 3
- addq 4, $acr
-
-;; Now, move on to the regular register restoration process.
-
- move.d reg, $acr ; Reset ACR to point at the beginning of the register image
- move.d [$acr], $r0 ; Restore R0
- addq 4, $acr
- move.d [$acr], $r1 ; Restore R1
- addq 4, $acr
- move.d [$acr], $r2 ; Restore R2
- addq 4, $acr
- move.d [$acr], $r3 ; Restore R3
- addq 4, $acr
- move.d [$acr], $r4 ; Restore R4
- addq 4, $acr
- move.d [$acr], $r5 ; Restore R5
- addq 4, $acr
- move.d [$acr], $r6 ; Restore R6
- addq 4, $acr
- move.d [$acr], $r7 ; Restore R7
- addq 4, $acr
- move.d [$acr], $r8 ; Restore R8
- addq 4, $acr
- move.d [$acr], $r9 ; Restore R9
- addq 4, $acr
- move.d [$acr], $r10 ; Restore R10
- addq 4, $acr
- move.d [$acr], $r11 ; Restore R11
- addq 4, $acr
- move.d [$acr], $r12 ; Restore R12
- addq 4, $acr
- move.d [$acr], $r13 ; Restore R13
-
-;;
-;; We restore all registers, even though some of them probably haven't changed.
-;;
-
- addq 4, $acr
- move.d [$acr], $sp ; Restore SP (R14)
-
- ;; ACR cannot be restored just yet.
- addq 8, $acr
-
- ;; Skip BZ, VR.
- addq 2, $acr
-
- move [$acr], $pid ; Restore PID
- addq 4, $acr
- move [$acr], $srs ; Restore SRS
- nop
- nop
- nop
- addq 1, $acr
-
- ;; Skip WZ.
- addq 2, $acr
-
- move [$acr], $exs ; Restore EXS.
- addq 4, $acr
- move [$acr], $eda ; Restore EDA.
- addq 4, $acr
- move [$acr], $mof ; Restore MOF.
-
- ;; Skip DZ.
- addq 8, $acr
-
- move [$acr], $ebp ; Restore EBP.
- addq 4, $acr
- move [$acr], $erp ; Restore ERP.
- addq 4, $acr
- move [$acr], $srp ; Restore SRP.
- addq 4, $acr
- move [$acr], $nrp ; Restore NRP.
- addq 4, $acr
- move [$acr], $ccs ; Restore CCS like an ordinary register.
- addq 4, $acr
- move [$acr], $usp ; Restore USP
- addq 4, $acr
- move [$acr], $spc ; Restore SPC
- ; No restoration of pseudo-PC of course.
-
- move.d reg, $acr ; Reset ACR to point at the beginning of the register image
- add.d 15*4, $acr
- move.d [$acr], $acr ; Finally, restore ACR.
- rete ; Same as jump ERP
- rfe ; Shifts CCS
projects / linux-2.6-block.git / blobdiff