[PATCH v1 17/20] riscv: Add semihosting support for user mode

From: "Alex Bennée" <alex.bennee@linaro.org>
To: qemu-devel@nongnu.org
Cc: "Kito Cheng" <kito.cheng@sifive.com>,
	"Alex Bennée" <alex.bennee@linaro.org>,
	"Keith Packard" <keithp@keithp.com>,
	"Laurent Vivier" <laurent@vivier.eu>
Subject: [PATCH  v1 17/20] riscv: Add semihosting support for user mode
Date: Fri,  8 Jan 2021 22:42:53 +0000	[thread overview]
Message-ID: <20210108224256.2321-18-alex.bennee@linaro.org> (raw)
In-Reply-To: <20210108224256.2321-1-alex.bennee@linaro.org>

From: Kito Cheng <kito.cheng@sifive.com>

This could made testing more easier and ARM/AArch64 has supported on
their linux user mode too, so I think it should be reasonable.

Verified GCC testsuite with newlib/semihosting.

Signed-off-by: Kito Cheng <kito.cheng@sifive.com>
Reviewed-by: Keith Packard <keithp@keithp.com>
Message-Id: <20210107170717.2098982-7-keithp@keithp.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
 linux-user/riscv/cpu_loop.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/linux-user/riscv/cpu_loop.c b/linux-user/riscv/cpu_loop.c
index aa9e437875..9665dabb09 100644
--- a/linux-user/riscv/cpu_loop.c
+++ b/linux-user/riscv/cpu_loop.c
@@ -23,6 +23,7 @@
 #include "qemu.h"
 #include "cpu_loop-common.h"
 #include "elf.h"
+#include "hw/semihosting/common-semi.h"
 
 void cpu_loop(CPURISCVState *env)
 {
@@ -91,6 +92,10 @@ void cpu_loop(CPURISCVState *env)
             sigcode = TARGET_SEGV_MAPERR;
             sigaddr = env->badaddr;
             break;
+        case RISCV_EXCP_SEMIHOST:
+            env->gpr[xA0] = do_common_semihosting(cs);
+            env->pc += 4;
+            break;
         case EXCP_DEBUG:
         gdbstep:
             signum = TARGET_SIGTRAP;
-- 
2.20.1


