hexagon-core.xml only exposes register p3_0 which is an alias that aggregates the predicate registers. It is more convenient for users to interact directly with the predicate registers.
Tested with lldb downloaded from this location https://github.com/llvm/llvm-project/releases/download/llvmorg-18.1.4/clang+llvm-18.1.4-x86_64-linux-gnu-ubuntu-18.04.tar.xz BEFORE: (lldb) reg read p3_0 p3_0 = 0x00000000 (lldb) reg read p0 error: Invalid register name 'p0'. (lldb) reg write p1 0xf error: Register not found for 'p1'. AFTER: (lldb) reg read p3_0 p3_0 = 0x00000000 (lldb) reg read p0 p0 = 0x00 (lldb) reg read -s 1 Predicate Registers: p0 = 0x00 p1 = 0x00 p2 = 0x00 p3 = 0x00 (lldb) reg write p1 0xf (lldb) reg read p3_0 p3_0 = 0x00000f00 (lldb) reg write p3_0 0xff00ff00 (lldb) reg read -s 1 Predicate Registers: p0 = 0x00 p1 = 0xff p2 = 0x00 p3 = 0xff Signed-off-by: Taylor Simpson <ltaylorsimp...@gmail.com> --- target/hexagon/gdbstub.c | 19 ++++++++++++++++++- gdb-xml/hexagon-core.xml | 6 +++++- 2 files changed, 23 insertions(+), 2 deletions(-) diff --git a/target/hexagon/gdbstub.c b/target/hexagon/gdbstub.c index 502c6987f0..e67e627fc9 100644 --- a/target/hexagon/gdbstub.c +++ b/target/hexagon/gdbstub.c @@ -1,5 +1,5 @@ /* - * Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved. + * Copyright(c) 2019-2024 Qualcomm Innovation Center, Inc. All Rights Reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -36,6 +36,14 @@ int hexagon_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n) return gdb_get_regl(mem_buf, env->gpr[n]); } + n -= TOTAL_PER_THREAD_REGS; + + if (n < NUM_PREGS) { + return gdb_get_reg8(mem_buf, env->pred[n]); + } + + n -= NUM_PREGS; + g_assert_not_reached(); } @@ -56,6 +64,15 @@ int hexagon_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n) return sizeof(target_ulong); } + n -= TOTAL_PER_THREAD_REGS; + + if (n < NUM_PREGS) { + env->pred[n] = ldtul_p(mem_buf); + return sizeof(uint8_t); + } + + n -= NUM_PREGS; + g_assert_not_reached(); } diff --git a/gdb-xml/hexagon-core.xml b/gdb-xml/hexagon-core.xml index e181163cff..b94378112a 100644 --- a/gdb-xml/hexagon-core.xml +++ b/gdb-xml/hexagon-core.xml @@ -1,6 +1,6 @@ <?xml version="1.0"?> <!-- - Copyright(c) 2023 Qualcomm Innovation Center, Inc. All Rights Reserved. + Copyright(c) 2023-2024 Qualcomm Innovation Center, Inc. All Rights Reserved. This work is licensed under the terms of the GNU GPL, version 2 or (at your option) any later version. See the COPYING file in the @@ -80,5 +80,9 @@ <reg name="c29" bitsize="32" offset="244" encoding="uint" format="hex" group="Thread Registers" dwarf_regnum="61"/> <reg name="utimerlo" bitsize="32" offset="248" encoding="uint" format="hex" group="Thread Registers" dwarf_regnum="62"/> <reg name="utimerhi" bitsize="32" offset="252" encoding="uint" format="hex" group="Thread Registers" dwarf_regnum="63"/> + <reg name="p0" bitsize="8" offset="256" encoding="uint" format="hex" group="Predicate Registers" dwarf_regnum="64"/> + <reg name="p1" bitsize="8" offset="257" encoding="uint" format="hex" group="Predicate Registers" dwarf_regnum="65"/> + <reg name="p2" bitsize="8" offset="258" encoding="uint" format="hex" group="Predicate Registers" dwarf_regnum="66"/> + <reg name="p3" bitsize="8" offset="259" encoding="uint" format="hex" group="Predicate Registers" dwarf_regnum="67"/> </feature> -- 2.34.1
