From 4e7f9032cf9bba8558b0fd5ab6a1366d6d7b8ee0 Mon Sep 17 00:00:00 2001
From: Alex Bennée <alex.bennee@linaro.org>
Date: Tue, 14 May 2019 15:30:14 +0100
Subject: semihosting: enable chardev backed output for console
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It will be useful for a number of use-cases to be able to re-direct
output to a file like we do with serial output. This does the wiring
to allow us to treat then semihosting console like just another
character output device.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
 hw/semihosting/config.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

(limited to 'hw/semihosting/config.c')

diff --git a/hw/semihosting/config.c b/hw/semihosting/config.c
index f1d3fe1e4c..2a8e7e1045 100644
--- a/hw/semihosting/config.c
+++ b/hw/semihosting/config.c
@@ -23,6 +23,7 @@
 #include "qemu/config-file.h"
 #include "qemu/error-report.h"
 #include "hw/semihosting/semihost.h"
+#include "chardev/char.h"
 
 QemuOptsList qemu_semihosting_config_opts = {
     .name = "semihosting-config",
@@ -35,6 +36,9 @@ QemuOptsList qemu_semihosting_config_opts = {
         }, {
             .name = "target",
             .type = QEMU_OPT_STRING,
+        }, {
+            .name = "chardev",
+            .type = QEMU_OPT_STRING,
         }, {
             .name = "arg",
             .type = QEMU_OPT_STRING,
@@ -46,12 +50,14 @@ QemuOptsList qemu_semihosting_config_opts = {
 typedef struct SemihostingConfig {
     bool enabled;
     SemihostingTarget target;
+    Chardev *chardev;
     const char **argv;
     int argc;
     const char *cmdline; /* concatenated argv */
 } SemihostingConfig;
 
 static SemihostingConfig semihosting;
+static const char *semihost_chardev;
 
 bool semihosting_enabled(void)
 {
@@ -115,6 +121,11 @@ void semihosting_arg_fallback(const char *file, const char *cmd)
     }
 }
 
+Chardev *semihosting_get_chardev(void)
+{
+    return semihosting.chardev;
+}
+
 void qemu_semihosting_enable(void)
 {
     semihosting.enabled = true;
@@ -132,6 +143,8 @@ int qemu_semihosting_config_options(const char *optarg)
         semihosting.enabled = qemu_opt_get_bool(opts, "enable",
                                                 true);
         const char *target = qemu_opt_get(opts, "target");
+        /* setup of chardev is deferred until they are initialised */
+        semihost_chardev = qemu_opt_get(opts, "chardev");
         if (target != NULL) {
             if (strcmp("native", target) == 0) {
                 semihosting.target = SEMIHOSTING_TARGET_NATIVE;
@@ -158,3 +171,16 @@ int qemu_semihosting_config_options(const char *optarg)
     return 0;
 }
 
+void qemu_semihosting_connect_chardevs(void)
+{
+    /* We had to defer this until chardevs were created */
+    if (semihost_chardev) {
+        Chardev *chr = qemu_chr_find(semihost_chardev);
+        if (chr == NULL) {
+            error_report("semihosting chardev '%s' not found",
+                         semihost_chardev);
+            exit(1);
+        }
+        semihosting.chardev = chr;
+    }
+}
-- 
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