misc QEMU fixes

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3351 42af7a65-404d-4744-a932-0658087f49c3

ChangeLog

@@ -1530,3 +1530,5 @@
 	  reported by Uros Platise).
 	* drivers/mtd/ramtron.c -  Driver for SPI-based RAMTRON NVRAM devices FM25V10
 	  (and others).  Contributed by Uros Platise.
+	* examples/nsh and tools/mkromfsimg.sh -- Add support for platform-specific
+	  ROMFS-based NSH start-up scripts.

Documentation/NuttX.html

@@ -8,7 +8,7 @@
   <tr align="center" bgcolor="#e4e4e4">
     <td>
       <h1><big><font color="#3c34ec"><i>NuttX RTOS</i></font></big></h1>
-      <p>Last Updated: March 6, 2011</p>
+      <p>Last Updated: March 7, 2011</p>
     </td>
   </tr>
 </table>
@@ -2154,6 +2154,8 @@ nuttx-5.19 2011-xx-xx Gregory Nutt &lt;spudmonkey@racsa.co.cr&gt;
       reported by Uros Platise).
     * drivers/mtd/ramtron.c -  Driver for SPI-based RAMTRON NVRAM devices FM25V10
       (and others).  Contributed by Uros Platise.
+    * examples/nsh and tools/mkromfsimg.sh -- Add support for platform-specific
+      ROMFS-based NSH start-up scripts.
 
 pascal-2.1 2011-xx-xx Gregory Nutt &lt;spudmonkey@racsa.co.cr&gt;
 

arch/x86/include/i486/arch.h

@@ -163,6 +163,44 @@ static inline uint32_t up_getsp()
   return regval;
 }
 
+/* Get segment registers */
+
+static inline uint32_t up_getds()
+{
+  uint32_t regval;
+
+  asm volatile(
+    "\tmov %%ds, %0\n"
+    : "=rm" (regval)
+    :
+    : "memory");
+  return regval;
+}
+
+static inline uint32_t up_getcs()
+{
+  uint32_t regval;
+
+  asm volatile(
+    "\tmov %%cs, %0\n"
+    : "=rm" (regval)
+    :
+    : "memory");
+  return regval;
+}
+
+static inline uint32_t up_getss()
+{
+  uint32_t regval;
+
+  asm volatile(
+    "\tmov %%ss, %0\n"
+    : "=rm" (regval)
+    :
+    : "memory");
+  return regval;
+}
+
 /****************************************************************************
  * Public Types
  ****************************************************************************/

arch/x86/src/i486/i486_utils.S

@@ -52,6 +52,8 @@
 # define SYMBOL(s) s
 #endif
 
+#define KSEG 0x10
+
 /****************************************************************************
  * Nasm
  ****************************************************************************/
@@ -84,12 +86,12 @@ SYMBOL(gdt_flush):
     mov		eax, [esp+4]		/* Get the pointer to the GDT, passed as a parameter */
     lgdt	[eax]				/* Load the new GDT pointer */
 
-    mov		ax, 0x10			/* 0x10 is the offset in the GDT to our data segment */
-    mov		ds, ax				/* Load all data segment selectors */
-    mov		es, ax
-    mov		fs, ax
-    mov		gs, ax
-    mov		ss, ax
+    mov		$KSEG, ax 			/* KSEG is the offset in the GDT to our data segment */
+    mov		ax, ds				/* Load all data segment selectors */
+    mov		ax, es
+    mov		ax, fs
+    mov		ax, gs
+    mov		ax, ss
     jmp		0x08:.gflush		/* 0x08 is the offset to our code segment: Far jump! */
 .gflush:
     ret
@@ -135,12 +137,12 @@ SYMBOL(gdt_flush):
     movl	%eax, 4(%esp)	/* Get the pointer to the GDT, passed as a parameter */
     lgdt	(%eax)			/* Load the new GDT pointer */
 
-    mov		%ax, 0x10		/* 0x10 is the offset in the GDT to our data segment */
-    mov		%ds, %ax		/* Load all data segment selectors */
-    mov		%es, %ax
-    mov		%fs, %ax
-    mov		%gs, %ax
-    mov		%ss, %ax
+    mov		$KSEG, %ax 		/* KSEG is the offset in the GDT to our data segment */
+    mov		%ax, %ds 		/* Load all data segment selectors */
+    mov		%ax, %es
+    mov		%ax, %fs
+    mov		%ax, %gs
+    mov		%ax, %ss
     jmp		$0x08, $.Lgflush		/* 0x08 is the offset to our code segment: Far jump! */
 .Lgflush:
     ret

arch/x86/src/i486/up_initialstate.c

@@ -93,6 +93,14 @@ void up_initial_state(_TCB *tcb)
 
   xcp->regs[REG_EIP]     = (uint32_t)tcb->start;
 
+  /* Set up the segment registers... assume the same segment as the caller.
+   * That is not a good assumption in the long run.
+   */
+
+  xcp->regs[REG_DS]      = up_getds();
+  xcp->regs[REG_CS]      = up_getcs();
+  xcp->regs[REG_SS]      = up_getss();
+
   /* Enable or disable interrupts, based on user configuration.  If the IF
    * bit is set, maskable interrupts will be enabled.
    */

arch/x86/src/qemu/qemu_vectors.S

@@ -408,14 +408,14 @@ isr_common:
 /*	trace	'S' */
 	pusha						/* Pushes edi,esi,ebp,esp,ebx,edx,ecx,eax */
 
-	mov		%ax, %ds			/* Lower 16-bits of eax = ds. */
+	mov		%ds, %ax			/* Lower 16-bits of eax = ds. */
 	pushl	%eax				/* Save the data segment descriptor */
 
-	mov		%ax, KSEG			/* Load the kernel data segment descriptor */
-	mov		%ds, %ax
-	mov		%es, %ax
-	mov		%fs, %ax
-	mov		%gs, %ax
+	mov		$KSEG, %ax 			/* Load the kernel data segment descriptor */
+	mov		%ax, %ds
+	mov		%ax, %es
+	mov		%ax, %fs
+	mov		%ax, %gs
 
 	/* The current value of the SP points to the beginning of the state save
 	 * structure.  Save that on the stack as the input parameter to isr_handler.
@@ -446,14 +446,14 @@ irq_common:
 /*	trace	'R' */
 	pusha						/* Pushes edi,esi,ebp,esp,ebx,edx,ecx,eax */
 
-	mov		%ax, %ds				/* Lower 16-bits of eax = ds. */
+	mov		%ds, %ax			/* Lower 16-bits of eax = ds. */
 	push	%eax				/* Save the data segment descriptor */
 
-	mov		%ax, KSEG			/* Load the kernel data segment descriptor */
-	mov		%ds, %ax
-	mov		%es, %ax
-	mov		%fs, %ax
-	mov		%gs, %ax
+	mov		$KSEG, %ax 			/* Load the kernel data segment descriptor */
+	mov		%ax, %ds
+	mov		%ax, %es
+	mov		%ax, %fs
+	mov		%ax, %gs
 
 	/* The current value of the SP points to the beginning of the state save
 	 * structure.  Save that on the stack as the input parameter to irq_handler.
@@ -488,13 +488,13 @@ irq_common:
 
 .Lnoswitch:
 	pop		%ebx				/* Reload the original data segment descriptor */
-	mov		%ds, %bx
-	mov		%es, %bx
-	mov		%fs, %bx
-	mov		%gs, %bx
+	mov		%bx, %ds
+	mov		%bx, %es
+	mov		%bx, %fs
+	mov		%bx, %gs
 
 	popa						/* Pops edi,esi,ebp... */
-	add		%esp, 8				/* Cleans up the pushed error code and pushed ISR number */
+	add		$8, %esp			/* Cleans up the pushed error code and pushed ISR number */
 	sti
 	iret						/* Pops 5 things at once: CS, EIP, EFLAGS, SS, and ESP */
 #ifndef __CYGWIN__

configs/qemu-i486/ostest/ld.script

@@ -33,7 +33,7 @@
  *
  ****************************************************************************/
 
-OUTPUT_ARCH(elf_i386)
+OUTPUT_ARCH(i386)
 ENTRY(__start)
 SECTIONS
 {

configs/qemu-i486/ostest/setenv.sh

@@ -42,7 +42,7 @@ if [ -z ${PATH_ORIG} ]; then export PATH_ORIG=${PATH}; fi
 # Uncomment and modify the following if you are using anything other
 # than the system GCC
 # WD=`pwd`
-# export BUILDROOT_BIN="${WD}/../../buildroot/build_i486/staging_dir/bin"
+# export BUILDROOT_BIN="${WD}/../../../buildroot/build_i486/staging_dir/bin"
 # export PATH="${BUILDROOT_BIN}:/sbin:/usr/sbin:${PATH_ORIG}"
 
 echo "PATH : ${PATH}"