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target/riscv: Expose "priv" register for GDB for reads

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This patch enables a debugger to read the current privilege level via a virtual
"priv" register. When compiled with CONFIG_USER_ONLY the register is still
visible but always reports the value zero.

Signed-off-by: Jonathan Behrens <jonathan@fintelia.io>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Jonathan Behrens 2019-10-14 11:45:28 -04:00 • committed by Palmer Dabbelt
parent a555ad1399
commit ab9056ff9b
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GPG key ID: EF4CA1502CCBAB41
4 changed files with 47 additions and 2 deletions
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11
gdb-xml/riscv-32bit-virtual.xml Normal file
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@ -0,0 +1,11 @@
<?xml version="1.0"?>
<!-- Copyright (C) 2018-2019 Free Software Foundation, Inc.
Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved. -->
<!DOCTYPE feature SYSTEM "gdb-target.dtd">
<feature name="org.gnu.gdb.riscv.virtual">
<reg name="priv" bitsize="32"/>
</feature>

11
gdb-xml/riscv-64bit-virtual.xml Normal file
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@ -0,0 +1,11 @@
<?xml version="1.0"?>
<!-- Copyright (C) 2018-2019 Free Software Foundation, Inc.
Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved. -->
<!DOCTYPE feature SYSTEM "gdb-target.dtd">
<feature name="org.gnu.gdb.riscv.virtual">
<reg name="priv" bitsize="64"/>
</feature>