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riscv: Add semihosting support

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Adapt the arm semihosting support code for RISCV. This implementation
is based on the standard for RISC-V semihosting version 0.2 as
documented in

   https://github.com/riscv/riscv-semihosting-spec/releases/tag/0.2

Signed-off-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20210107170717.2098982-6-keithp@keithp.com>
Message-Id: <20210108224256.2321-17-alex.bennee@linaro.org>
This commit is contained in:
Keith Packard 2021-01-08 22:42:52 +00:00 • committed by Alex Bennée
parent 095f8c0293
commit a10b9d93ec
13 changed files with 162 additions and 12 deletions
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4
linux-user/qemu.h
View file

@ -109,6 +109,8 @@ typedef struct TaskState {
/* FPA state */
FPA11 fpa;
# endif
#endif
#if defined(TARGET_ARM) || defined(TARGET_RISCV)
int swi_errno;
#endif
#if defined(TARGET_I386) && !defined(TARGET_X86_64)
@ -122,7 +124,7 @@ typedef struct TaskState {
#ifdef TARGET_M68K
abi_ulong tp_value;
#endif
#if defined(TARGET_ARM) || defined(TARGET_M68K)
#if defined(TARGET_ARM) || defined(TARGET_M68K) || defined(TARGET_RISCV)
/* Extra fields for semihosted binaries. */
abi_ulong heap_base;
abi_ulong heap_limit;

8
linux-user/semihost.c
View file

@ -1,11 +1,11 @@
/*
* ARM Semihosting Console Support
* ARM Compatible Semihosting Console Support.
*
* Copyright (c) 2019 Linaro Ltd
*
* Currently ARM is unique in having support for semihosting support
* in linux-user. So for now we implement the common console API but
* just for arm linux-user.
* Currently ARM and RISC-V are unique in having support for
* semihosting support in linux-user. So for now we implement the
* common console API but just for arm and risc-v linux-user.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/