projects / linux-2.6 / blame
| Commit | Line | Data |
|---|---|---|
| b920de1b DH |
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> | |
| 21 | #include <asm/unit/serial.h> | |
| 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 |