[OpenBIOS] [PATCHv2 06/14] SPARC32: fix romvec stdin/stdout field initialisation

[Mark Cave-Ayland]

Previously the romvec stdin/stdout ihandles were configured so that they were
set to the current stdin and stdout paths at initialisation time. Unfortunately
as stdin/stdout can be changed with the input and output words, they can end
up pointing to invalid ihandles causing a crash when trying to output to the
console.

Fix this by pointing the romvec structure to the address of the stdin/stdout
variables so that they are always in sync. Similarly we also resolve the
text path stdin/stdout variables at boot time to ensure that they will never
be stale.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland at ilande.co.uk>
---
 openbios-devel/arch/sparc32/boot.c   |   15 +++++++++++++--
 openbios-devel/arch/sparc32/romvec.c |   14 +++++---------
 2 files changed, 18 insertions(+), 11 deletions(-)

diff --git a/openbios-devel/arch/sparc32/boot.c b/openbios-devel/arch/sparc32/boot.c
index 9e49984..20d3289 100644
--- a/openbios-devel/arch/sparc32/boot.c
+++ b/openbios-devel/arch/sparc32/boot.c
@@ -23,7 +23,7 @@ const void *romvec;
 void go(void)
 {
 	ucell address, type, size;
-	int image_retval = 0, proplen, target, device;
+	int image_retval = 0, intprop, proplen, target, device;
 	phandle_t chosen;
 	char *prop, *id, *name;
 	static char bootpathbuf[128], bootargsbuf[128], buf[128];
@@ -40,8 +40,19 @@ void go(void)
 	   needs to be set up to pass certain parameters using a C struct. Hence this section
 	   extracts the relevant boot information and places it in obp_arg. */
 	
-	/* Get the name of the selected boot device, along with the device and unit number */
+	/* Get the stdin and stdout paths */
 	chosen = find_dev("/chosen");
+	intprop = get_int_property(chosen, "stdin", &proplen);
+	PUSH(intprop);
+	fword("get-instance-path");
+	((struct linux_romvec *)romvec)->pv_stdin = pop_fstr_copy();
+
+	intprop = get_int_property(chosen, "stdout", &proplen);
+	PUSH(intprop);
+	fword("get-instance-path");
+	((struct linux_romvec *)romvec)->pv_stdout = pop_fstr_copy();
+
+	/* Get the name of the selected boot device, along with the device and unit number */
 	prop = get_property(chosen, "bootpath", &proplen);
 	strncpy(bootpathbuf, prop, proplen);
 	prop = get_property(chosen, "bootargs", &proplen);
diff --git a/openbios-devel/arch/sparc32/romvec.c b/openbios-devel/arch/sparc32/romvec.c
index 2e154c1..b1083c3 100644
--- a/openbios-devel/arch/sparc32/romvec.c
+++ b/openbios-devel/arch/sparc32/romvec.c
@@ -25,7 +25,6 @@
 #endif
 
 char obp_stdin, obp_stdout;
-static int obp_fd_stdin, obp_fd_stdout;
 const char *obp_stdin_path, *obp_stdout_path;
 
 struct linux_arguments_v0 obp_arg;
@@ -498,15 +497,12 @@ init_openprom(void)
     romvec0.pv_v2bootargs.bootpath = &bootpath;
 
     romvec0.pv_v2bootargs.bootargs = &obp_arg.argv[1];
-    romvec0.pv_v2bootargs.fd_stdin = &obp_fd_stdin;
-    romvec0.pv_v2bootargs.fd_stdout = &obp_fd_stdout;
 
-    push_str(obp_stdin_path);
-    fword("open-dev");
-    obp_fd_stdin = POP();
-    push_str(obp_stdout_path);
-    fword("open-dev");
-    obp_fd_stdout = POP();
+    /* Point fd_stdin/fd_stdout to the Forth stdin/stdout variables */
+    fword("stdin");
+    romvec0.pv_v2bootargs.fd_stdin = cell2pointer(POP());
+    fword("stdout");
+    romvec0.pv_v2bootargs.fd_stdout = cell2pointer(POP());
 
     romvec0.v3_memalloc = obp_memalloc_handler;
 
-- 
1.7.10.4