Andreas Färber | 58850da | 2013-07-07 12:32:15 +0200 | [diff] [blame] | 1 | /* |
| 2 | * ARM gdb server stub |
| 3 | * |
| 4 | * Copyright (c) 2003-2005 Fabrice Bellard |
| 5 | * Copyright (c) 2013 SUSE LINUX Products GmbH |
| 6 | * |
| 7 | * This library is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * This library is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
| 19 | */ |
Peter Maydell | 74c21bd | 2015-12-07 16:23:44 +0000 | [diff] [blame] | 20 | #include "qemu/osdep.h" |
Andreas Färber | 5b50e79 | 2013-06-29 04:18:45 +0200 | [diff] [blame] | 21 | #include "qemu-common.h" |
Paolo Bonzini | 33c1187 | 2016-03-15 16:58:45 +0100 | [diff] [blame] | 22 | #include "cpu.h" |
Andreas Färber | 5b50e79 | 2013-06-29 04:18:45 +0200 | [diff] [blame] | 23 | #include "exec/gdbstub.h" |
Andreas Färber | 58850da | 2013-07-07 12:32:15 +0200 | [diff] [blame] | 24 | |
| 25 | /* Old gdb always expect FPA registers. Newer (xml-aware) gdb only expect |
| 26 | whatever the target description contains. Due to a historical mishap |
| 27 | the FPA registers appear in between core integer regs and the CPSR. |
| 28 | We hack round this by giving the FPA regs zero size when talking to a |
| 29 | newer gdb. */ |
| 30 | |
Andreas Färber | 5b50e79 | 2013-06-29 04:18:45 +0200 | [diff] [blame] | 31 | int arm_cpu_gdb_read_register(CPUState *cs, uint8_t *mem_buf, int n) |
Andreas Färber | 58850da | 2013-07-07 12:32:15 +0200 | [diff] [blame] | 32 | { |
Andreas Färber | 5b50e79 | 2013-06-29 04:18:45 +0200 | [diff] [blame] | 33 | ARMCPU *cpu = ARM_CPU(cs); |
| 34 | CPUARMState *env = &cpu->env; |
| 35 | |
Andreas Färber | 58850da | 2013-07-07 12:32:15 +0200 | [diff] [blame] | 36 | if (n < 16) { |
| 37 | /* Core integer register. */ |
Andreas Färber | 986a299 | 2013-07-07 13:05:05 +0200 | [diff] [blame] | 38 | return gdb_get_reg32(mem_buf, env->regs[n]); |
Andreas Färber | 58850da | 2013-07-07 12:32:15 +0200 | [diff] [blame] | 39 | } |
| 40 | if (n < 24) { |
| 41 | /* FPA registers. */ |
| 42 | if (gdb_has_xml) { |
| 43 | return 0; |
| 44 | } |
| 45 | memset(mem_buf, 0, 12); |
| 46 | return 12; |
| 47 | } |
| 48 | switch (n) { |
| 49 | case 24: |
| 50 | /* FPA status register. */ |
| 51 | if (gdb_has_xml) { |
| 52 | return 0; |
| 53 | } |
Andreas Färber | 986a299 | 2013-07-07 13:05:05 +0200 | [diff] [blame] | 54 | return gdb_get_reg32(mem_buf, 0); |
Andreas Färber | 58850da | 2013-07-07 12:32:15 +0200 | [diff] [blame] | 55 | case 25: |
| 56 | /* CPSR */ |
Andreas Färber | 986a299 | 2013-07-07 13:05:05 +0200 | [diff] [blame] | 57 | return gdb_get_reg32(mem_buf, cpsr_read(env)); |
Andreas Färber | 58850da | 2013-07-07 12:32:15 +0200 | [diff] [blame] | 58 | } |
| 59 | /* Unknown register. */ |
| 60 | return 0; |
| 61 | } |
| 62 | |
Andreas Färber | 5b50e79 | 2013-06-29 04:18:45 +0200 | [diff] [blame] | 63 | int arm_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n) |
Andreas Färber | 58850da | 2013-07-07 12:32:15 +0200 | [diff] [blame] | 64 | { |
Andreas Färber | 5b50e79 | 2013-06-29 04:18:45 +0200 | [diff] [blame] | 65 | ARMCPU *cpu = ARM_CPU(cs); |
| 66 | CPUARMState *env = &cpu->env; |
Andreas Färber | 58850da | 2013-07-07 12:32:15 +0200 | [diff] [blame] | 67 | uint32_t tmp; |
| 68 | |
| 69 | tmp = ldl_p(mem_buf); |
| 70 | |
| 71 | /* Mask out low bit of PC to workaround gdb bugs. This will probably |
| 72 | cause problems if we ever implement the Jazelle DBX extensions. */ |
| 73 | if (n == 15) { |
| 74 | tmp &= ~1; |
| 75 | } |
| 76 | |
| 77 | if (n < 16) { |
| 78 | /* Core integer register. */ |
| 79 | env->regs[n] = tmp; |
| 80 | return 4; |
| 81 | } |
| 82 | if (n < 24) { /* 16-23 */ |
| 83 | /* FPA registers (ignored). */ |
| 84 | if (gdb_has_xml) { |
| 85 | return 0; |
| 86 | } |
| 87 | return 12; |
| 88 | } |
| 89 | switch (n) { |
| 90 | case 24: |
| 91 | /* FPA status register (ignored). */ |
| 92 | if (gdb_has_xml) { |
| 93 | return 0; |
| 94 | } |
| 95 | return 4; |
| 96 | case 25: |
| 97 | /* CPSR */ |
Peter Maydell | 50866ba | 2016-02-23 15:36:43 +0000 | [diff] [blame] | 98 | cpsr_write(env, tmp, 0xffffffff, CPSRWriteByGDBStub); |
Andreas Färber | 58850da | 2013-07-07 12:32:15 +0200 | [diff] [blame] | 99 | return 4; |
| 100 | } |
| 101 | /* Unknown register. */ |
| 102 | return 0; |
| 103 | } |