| David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 1 | ############################################################################### |
| 2 | # |
| 3 | # 16550 serial Rx interrupt handler for gdbstub I/O |
| 4 | # |
| 5 | # Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. |
| 6 | # Written by David Howells (dhowells@redhat.com) |
| 7 | # |
| 8 | # This program is free software; you can redistribute it and/or |
| 9 | # modify it under the terms of the GNU General Public Licence |
| 10 | # as published by the Free Software Foundation; either version |
| 11 | # 2 of the Licence, or (at your option) any later version. |
| 12 | # |
| 13 | ############################################################################### |
| 14 | #include <linux/sys.h> |
| 15 | #include <linux/linkage.h> |
| 16 | #include <asm/smp.h> |
| 17 | #include <asm/cpu-regs.h> |
| 18 | #include <asm/thread_info.h> |
| 19 | #include <asm/frame.inc> |
| 20 | #include <asm/intctl-regs.h> |
| David Howells | 2f2a213 | 2009-04-10 14:33:48 +0100 | [diff] [blame] | 21 | #include <unit/serial.h> |
| David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 22 | |
| 23 | .text |
| 24 | |
| 25 | ############################################################################### |
| 26 | # |
| 27 | # GDB stub serial receive interrupt entry point |
| 28 | # - intended to run at interrupt priority 0 |
| 29 | # |
| 30 | ############################################################################### |
| 31 | .globl gdbstub_io_rx_handler |
| 32 | .type gdbstub_io_rx_handler,@function |
| 33 | gdbstub_io_rx_handler: |
| 34 | movm [d2,d3,a2,a3],(sp) |
| 35 | |
| 36 | #if 1 |
| 37 | movbu (GDBPORT_SERIAL_IIR),d2 |
| 38 | #endif |
| 39 | |
| 40 | mov (gdbstub_rx_inp),a3 |
| 41 | gdbstub_io_rx_more: |
| 42 | mov a3,a2 |
| 43 | add 2,a3 |
| 44 | and 0x00000fff,a3 |
| 45 | mov (gdbstub_rx_outp),d3 |
| 46 | cmp a3,d3 |
| 47 | beq gdbstub_io_rx_overflow |
| 48 | |
| 49 | movbu (GDBPORT_SERIAL_LSR),d3 |
| 50 | btst UART_LSR_DR,d3 |
| 51 | beq gdbstub_io_rx_done |
| 52 | movbu (GDBPORT_SERIAL_RX),d2 |
| 53 | movbu d3,(gdbstub_rx_buffer+1,a2) |
| 54 | movbu d2,(gdbstub_rx_buffer,a2) |
| 55 | mov a3,(gdbstub_rx_inp) |
| 56 | bra gdbstub_io_rx_more |
| 57 | |
| 58 | gdbstub_io_rx_done: |
| 59 | mov GxICR_DETECT,d2 |
| 60 | movbu d2,(XIRQxICR(GDBPORT_SERIAL_IRQ)) # ACK the interrupt |
| 61 | movhu (XIRQxICR(GDBPORT_SERIAL_IRQ)),d2 # flush |
| 62 | movm (sp),[d2,d3,a2,a3] |
| 63 | bset 0x01,(gdbstub_busy) |
| 64 | beq gdbstub_io_rx_enter |
| 65 | rti |
| 66 | |
| 67 | gdbstub_io_rx_overflow: |
| 68 | bset 0x01,(gdbstub_rx_overflow) |
| 69 | bra gdbstub_io_rx_done |
| 70 | |
| 71 | gdbstub_io_rx_enter: |
| 72 | or EPSW_IE|EPSW_IM_1,epsw |
| 73 | add -4,sp |
| 74 | SAVE_ALL |
| 75 | |
| 76 | mov 0xffffffff,d0 |
| 77 | mov d0,(REG_ORIG_D0,fp) |
| 78 | mov 0x280,d1 |
| 79 | |
| 80 | mov fp,d0 |
| 81 | call gdbstub_rx_irq[],0 # gdbstub_rx_irq(regs,excep) |
| 82 | |
| 83 | and ~EPSW_IE,epsw |
| 84 | bclr 0x01,(gdbstub_busy) |
| 85 | |
| 86 | .globl gdbstub_return |
| 87 | gdbstub_return: |
| 88 | RESTORE_ALL |
| 89 | |
| 90 | .size gdbstub_io_rx_handler,.-gdbstub_io_rx_handler |