File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/arch/cris/arch-v32/kernel/kgdb_asm.S b/arch/cris/arch-v32/kernel/kgdb_asm.S
new file mode 100644
index 0000000..f3a4760
--- /dev/null
+++ b/arch/cris/arch-v32/kernel/kgdb_asm.S
@@ -0,0 +1,551 @@
+/*
+ * 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