[uaccess] Replace real_to_user() with real_to_virt()

Remove the intermediate concept of a user pointer from real address
conversion, leaving real_to_virt() as the directly implemented
function.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

19 files changed, 43 insertions, 43 deletions

diff --git a/src/arch/x86/image/bzimage.c b/src/arch/x86/image/bzimage.c
index 0f373c1c8..b6a159847 100644
--- a/src/arch/x86/image/bzimage.c
+++ b/src/arch/x86/image/bzimage.c
@@ -158,7 +158,7 @@ static int bzimage_parse_header ( struct image *image,
 
 	/* Calculate load address of real-mode portion */
 	bzimg->rm_kernel_seg = ( is_bzimage ? 0x1000 : 0x9000 );
-	bzimg->rm_kernel = real_to_user ( bzimg->rm_kernel_seg, 0 );
+	bzimg->rm_kernel = real_to_virt ( bzimg->rm_kernel_seg, 0 );
 
 	/* Allow space for the stack and heap */
 	bzimg->rm_memsz += BZI_STACK_SIZE;
diff --git a/src/arch/x86/image/com32.c b/src/arch/x86/image/com32.c
index a2b60987d..9a5793b7c 100644
--- a/src/arch/x86/image/com32.c
+++ b/src/arch/x86/image/com32.c
@@ -236,7 +236,7 @@ static int com32_prepare_bounce_buffer ( struct image * image ) {
 	int rc;
 
 	seg = COM32_BOUNCE_SEG;
-	seg_userptr = real_to_user ( seg, 0 );
+	seg_userptr = real_to_virt ( seg, 0 );
 
 	/* Ensure the entire 64k segment is free */
 	memsz = 0xFFFF;
diff --git a/src/arch/x86/image/comboot.c b/src/arch/x86/image/comboot.c
index 8609eb0f7..b171ecb02 100644
--- a/src/arch/x86/image/comboot.c
+++ b/src/arch/x86/image/comboot.c
@@ -132,7 +132,7 @@ static void comboot_init_psp ( struct image * image, userptr_t seg_userptr ) {
  * @ret rc		Return status code
  */
 static int comboot_exec_loop ( struct image *image ) {
-	userptr_t seg_userptr = real_to_user ( COMBOOT_PSP_SEG, 0 );
+	userptr_t seg_userptr = real_to_virt ( COMBOOT_PSP_SEG, 0 );
 	int state;
 
 	state = rmsetjmp ( comboot_return );
@@ -251,7 +251,7 @@ static int comboot_prepare_segment ( struct image *image )
 	int rc;
 
 	/* Load image in segment */
-	seg_userptr = real_to_user ( COMBOOT_PSP_SEG, 0 );
+	seg_userptr = real_to_virt ( COMBOOT_PSP_SEG, 0 );
 
 	/* Allow etra 0x100 bytes before image for PSP */
 	filesz = image->len + 0x100;
diff --git a/src/arch/x86/image/nbi.c b/src/arch/x86/image/nbi.c
index 1f72c1287..41c6e6ffd 100644
--- a/src/arch/x86/image/nbi.c
+++ b/src/arch/x86/image/nbi.c
@@ -159,7 +159,7 @@ static int nbi_process_segments ( struct image *image,
 	int rc;
 	
 	/* Copy image header to target location */
-	dest = real_to_user ( imgheader->location.segment,
+	dest = real_to_virt ( imgheader->location.segment,
 			      imgheader->location.offset );
 	filesz = memsz = NBI_HEADER_LENGTH;
 	if ( ( rc = process ( image, offset, dest, filesz, memsz ) ) != 0 )
diff --git a/src/arch/x86/image/pxe_image.c b/src/arch/x86/image/pxe_image.c
index bdce165ca..5472ea594 100644
--- a/src/arch/x86/image/pxe_image.c
+++ b/src/arch/x86/image/pxe_image.c
@@ -54,7 +54,7 @@ const char *pxe_cmdline;
  * @ret rc		Return status code
  */
 static int pxe_exec ( struct image *image ) {
-	userptr_t buffer = real_to_user ( 0, 0x7c00 );
+	userptr_t buffer = real_to_virt ( 0, 0x7c00 );
 	struct net_device *netdev;
 	int rc;
 
diff --git a/src/arch/x86/image/sdi.c b/src/arch/x86/image/sdi.c
index 5e22daeb3..40fab2a10 100644
--- a/src/arch/x86/image/sdi.c
+++ b/src/arch/x86/image/sdi.c
@@ -98,7 +98,7 @@ static int sdi_exec ( struct image *image ) {
 	       sdi.boot_size );
 
 	/* Copy boot code */
-	memcpy ( real_to_user ( SDI_BOOT_SEG, SDI_BOOT_OFF ),
+	memcpy ( real_to_virt ( SDI_BOOT_SEG, SDI_BOOT_OFF ),
 		 ( image->data + sdi.boot_offset ), sdi.boot_size );
 
 	/* Jump to boot code */
diff --git a/src/arch/x86/include/libkir.h b/src/arch/x86/include/libkir.h
index 1f5b13504..76766b6c2 100644
--- a/src/arch/x86/include/libkir.h
+++ b/src/arch/x86/include/libkir.h
@@ -194,7 +194,7 @@ copy_from_user ( void *dest, userptr_t buffer, off_t offset, size_t len ) {
  * @ret buffer	User buffer
  */
 static inline __attribute__ (( always_inline )) userptr_t
-real_to_user ( unsigned int segment, unsigned int offset ) {
+real_to_virt ( unsigned int segment, unsigned int offset ) {
 	return ( ( segment << 16 ) | offset );
 }
 
@@ -210,7 +210,7 @@ real_to_user ( unsigned int segment, unsigned int offset ) {
  */
 static inline __attribute__ (( always_inline )) userptr_t
 virt_to_user ( void * virtual ) {
-	return real_to_user ( rm_ds, ( intptr_t ) virtual );
+	return real_to_virt ( rm_ds, ( intptr_t ) virtual );
 }
 
 /* TEXT16_CODE: declare a fragment of code that resides in .text16 */
diff --git a/src/arch/x86/include/realmode.h b/src/arch/x86/include/realmode.h
index 616db5eb9..0017b42c0 100644
--- a/src/arch/x86/include/realmode.h
+++ b/src/arch/x86/include/realmode.h
@@ -65,14 +65,14 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
  */
 
 /**
- * Convert segment:offset address to user buffer
+ * Convert segment:offset address to virtual address
  *
  * @v segment		Real-mode segment
  * @v offset		Real-mode offset
- * @ret buffer		User buffer
+ * @ret virt		Virtual address
  */
-static inline __always_inline userptr_t
-real_to_user ( unsigned int segment, unsigned int offset ) {
+static inline __always_inline void *
+real_to_virt ( unsigned int segment, unsigned int offset ) {
 	return ( phys_to_virt ( ( segment << 4 ) + offset ) );
 }
 
@@ -87,7 +87,7 @@ real_to_user ( unsigned int segment, unsigned int offset ) {
 static inline __always_inline void
 copy_to_real ( unsigned int dest_seg, unsigned int dest_off,
 	       void *src, size_t n ) {
-	copy_to_user ( real_to_user ( dest_seg, dest_off ), 0, src, n );
+	copy_to_user ( real_to_virt ( dest_seg, dest_off ), 0, src, n );
 }
 
 /**
@@ -101,7 +101,7 @@ copy_to_real ( unsigned int dest_seg, unsigned int dest_off,
 static inline __always_inline void
 copy_from_real ( void *dest, unsigned int src_seg,
 		 unsigned int src_off, size_t n ) {
-	copy_from_user ( dest, real_to_user ( src_seg, src_off ), 0, n );
+	copy_from_user ( dest, real_to_virt ( src_seg, src_off ), 0, n );
 }
 
 /**
diff --git a/src/arch/x86/interface/pcbios/bios_smbios.c b/src/arch/x86/interface/pcbios/bios_smbios.c
index ab53d424b..e43c74bad 100644
--- a/src/arch/x86/interface/pcbios/bios_smbios.c
+++ b/src/arch/x86/interface/pcbios/bios_smbios.c
@@ -49,7 +49,7 @@ static int bios_find_smbios2 ( struct smbios *smbios ) {
 	int rc;
 
 	/* Scan through BIOS segment to find SMBIOS 32-bit entry point */
-	if ( ( rc = find_smbios_entry ( real_to_user ( BIOS_SEG, 0 ), 0x10000,
+	if ( ( rc = find_smbios_entry ( real_to_virt ( BIOS_SEG, 0 ), 0x10000,
 					&entry ) ) != 0 )
 		return rc;
 
@@ -73,7 +73,7 @@ static int bios_find_smbios3 ( struct smbios *smbios ) {
 	int rc;
 
 	/* Scan through BIOS segment to find SMBIOS 64-bit entry point */
-	if ( ( rc = find_smbios3_entry ( real_to_user ( BIOS_SEG, 0 ), 0x10000,
+	if ( ( rc = find_smbios3_entry ( real_to_virt ( BIOS_SEG, 0 ), 0x10000,
 					 &entry ) ) != 0 )
 		return rc;
 
diff --git a/src/arch/x86/interface/pcbios/int13.c b/src/arch/x86/interface/pcbios/int13.c
index d60f7c7cc..498676b70 100644
--- a/src/arch/x86/interface/pcbios/int13.c
+++ b/src/arch/x86/interface/pcbios/int13.c
@@ -549,7 +549,7 @@ static int int13_rw_sectors ( struct san_device *sandev,
 	lba = ( ( ( ( cylinder * int13->heads ) + head )
 		  * int13->sectors_per_track ) + sector - 1 );
 	count = ix86->regs.al;
-	buffer = real_to_user ( ix86->segs.es, ix86->regs.bx );
+	buffer = real_to_virt ( ix86->segs.es, ix86->regs.bx );
 
 	DBGC2 ( sandev->drive, "C/H/S %d/%d/%d = LBA %08lx <-> %04x:%04x "
 		"(count %d)\n", cylinder, head, sector, lba, ix86->segs.es,
@@ -747,7 +747,7 @@ static int int13_extended_rw ( struct san_device *sandev,
 		DBGC2 ( sandev->drive, "%08llx",
 			( ( unsigned long long ) addr.buffer_phys ) );
 	} else {
-		buffer = real_to_user ( addr.buffer.segment,
+		buffer = real_to_virt ( addr.buffer.segment,
 					addr.buffer.offset );
 		DBGC2 ( sandev->drive, "%04x:%04x", addr.buffer.segment,
 			addr.buffer.offset );
diff --git a/src/arch/x86/interface/pcbios/rsdp.c b/src/arch/x86/interface/pcbios/rsdp.c
index 02c58c780..c2534c7f6 100644
--- a/src/arch/x86/interface/pcbios/rsdp.c
+++ b/src/arch/x86/interface/pcbios/rsdp.c
@@ -106,7 +106,7 @@ static userptr_t rsdp_find_rsdt ( void ) {
 	/* Search EBDA */
 	get_real ( ebda_seg, BDA_SEG, BDA_EBDA );
 	if ( ebda_seg < RSDP_EBDA_END_SEG ) {
-	     ebda = real_to_user ( ebda_seg, 0 );
+	     ebda = real_to_virt ( ebda_seg, 0 );
 	     ebda_len = ( ( RSDP_EBDA_END_SEG - ebda_seg ) * 16 );
 	     rsdt = rsdp_find_rsdt_range ( ebda, ebda_len );
 	     if ( rsdt )
diff --git a/src/arch/x86/interface/pcbios/vesafb.c b/src/arch/x86/interface/pcbios/vesafb.c
index 61609fa8c..cfa935126 100644
--- a/src/arch/x86/interface/pcbios/vesafb.c
+++ b/src/arch/x86/interface/pcbios/vesafb.c
@@ -243,7 +243,7 @@ static int vesafb_mode_list ( uint16_t **mode_numbers ) {
 	       controller->video_mode_ptr.offset );
 
 	/* Calculate length of mode list */
-	video_mode_ptr = real_to_user ( controller->video_mode_ptr.segment,
+	video_mode_ptr = real_to_virt ( controller->video_mode_ptr.segment,
 					controller->video_mode_ptr.offset );
 	len = 0;
 	do {
diff --git a/src/arch/x86/interface/pxe/pxe_call.c b/src/arch/x86/interface/pxe/pxe_call.c
index 0e8d5c5a8..f88943fb2 100644
--- a/src/arch/x86/interface/pxe/pxe_call.c
+++ b/src/arch/x86/interface/pxe/pxe_call.c
@@ -144,7 +144,7 @@ static struct profiler * pxe_api_profiler ( unsigned int opcode ) {
  */
 __asmcall void pxe_api_call ( struct i386_all_regs *ix86 ) {
 	uint16_t opcode = ix86->regs.bx;
-	userptr_t uparams = real_to_user ( ix86->segs.es, ix86->regs.di );
+	userptr_t uparams = real_to_virt ( ix86->segs.es, ix86->regs.di );
 	struct profiler *profiler = pxe_api_profiler ( opcode );
 	struct pxe_api_call *call;
 	union u_PXENV_ANY params;
@@ -195,7 +195,7 @@ int pxe_api_call_weak ( struct i386_all_regs *ix86 ) {
  * @ret ax		PXE exit code
  */
 __asmcall void pxe_loader_call ( struct i386_all_regs *ix86 ) {
-	userptr_t uparams = real_to_user ( ix86->segs.es, ix86->regs.di );
+	userptr_t uparams = real_to_virt ( ix86->segs.es, ix86->regs.di );
 	struct s_UNDI_LOADER params;
 	PXENV_EXIT_t ret;
 
diff --git a/src/arch/x86/interface/pxe/pxe_file.c b/src/arch/x86/interface/pxe/pxe_file.c
index 1235520de..64bc335f2 100644
--- a/src/arch/x86/interface/pxe/pxe_file.c
+++ b/src/arch/x86/interface/pxe/pxe_file.c
@@ -60,7 +60,7 @@ static PXENV_EXIT_t pxenv_file_open ( struct s_PXENV_FILE_OPEN *file_open ) {
 	DBG ( "PXENV_FILE_OPEN" );
 
 	/* Copy name from external program, and open it */
-	filename = real_to_user ( file_open->FileName.segment,
+	filename = real_to_virt ( file_open->FileName.segment,
 				  file_open->FileName.offset );
 	filename_len = strlen ( filename );
 	{
@@ -155,7 +155,7 @@ static PXENV_EXIT_t pxenv_file_read ( struct s_PXENV_FILE_READ *file_read ) {
 	      file_read->Buffer.segment, file_read->Buffer.offset,
 	      file_read->BufferSize );
 
-	buffer = real_to_user ( file_read->Buffer.segment,
+	buffer = real_to_virt ( file_read->Buffer.segment,
 				file_read->Buffer.offset );
 	if ( ( len = read_user ( file_read->FileHandle, buffer, 0,
 				file_read->BufferSize ) ) < 0 ) {
@@ -217,7 +217,7 @@ static PXENV_EXIT_t pxenv_file_exec ( struct s_PXENV_FILE_EXEC *file_exec ) {
 	DBG ( "PXENV_FILE_EXEC" );
 
 	/* Copy name from external program, and exec it */
-	command = real_to_user ( file_exec->Command.segment,
+	command = real_to_virt ( file_exec->Command.segment,
 				 file_exec->Command.offset );
 	command_len = strlen ( command );
 	{
@@ -259,7 +259,7 @@ pxenv_file_cmdline ( struct s_PXENV_FILE_CMDLINE *file_cmdline ) {
 	      file_cmdline->Buffer.segment, file_cmdline->Buffer.offset,
 	      file_cmdline->BufferSize, pxe_cmdline );
 
-	buffer = real_to_user ( file_cmdline->Buffer.segment,
+	buffer = real_to_virt ( file_cmdline->Buffer.segment,
 				file_cmdline->Buffer.offset );
 	len = file_cmdline->BufferSize;
 	max_len = ( pxe_cmdline ?
diff --git a/src/arch/x86/interface/pxe/pxe_preboot.c b/src/arch/x86/interface/pxe/pxe_preboot.c
index 09e721b34..727d8e1ea 100644
--- a/src/arch/x86/interface/pxe/pxe_preboot.c
+++ b/src/arch/x86/interface/pxe/pxe_preboot.c
@@ -243,7 +243,7 @@ pxenv_get_cached_info ( struct s_PXENV_GET_CACHED_INFO *get_cached_info ) {
 			len = sizeof ( *info );
 		if ( len < sizeof ( *info ) )
 			DBGC ( &pxe_netdev, " buffer may be too short" );
-		buffer = real_to_user ( get_cached_info->Buffer.segment,
+		buffer = real_to_virt ( get_cached_info->Buffer.segment,
 					get_cached_info->Buffer.offset );
 		copy_to_user ( buffer, 0, info, len );
 		get_cached_info->BufferSize = len;
diff --git a/src/arch/x86/interface/pxe/pxe_tftp.c b/src/arch/x86/interface/pxe/pxe_tftp.c
index 2c2eccca4..073414dce 100644
--- a/src/arch/x86/interface/pxe/pxe_tftp.c
+++ b/src/arch/x86/interface/pxe/pxe_tftp.c
@@ -378,7 +378,7 @@ static PXENV_EXIT_t pxenv_tftp_read ( struct s_PXENV_TFTP_READ *tftp_read ) {
 	      tftp_read->Buffer.segment, tftp_read->Buffer.offset );
 
 	/* Read single block into buffer */
-	pxe_tftp.buffer = real_to_user ( tftp_read->Buffer.segment,
+	pxe_tftp.buffer = real_to_virt ( tftp_read->Buffer.segment,
 					 tftp_read->Buffer.offset );
 	pxe_tftp.size = pxe_tftp.blksize;
 	pxe_tftp.start = pxe_tftp.offset;
diff --git a/src/arch/x86/interface/pxe/pxe_udp.c b/src/arch/x86/interface/pxe/pxe_udp.c
index a5d5eb77b..47abb7df4 100644
--- a/src/arch/x86/interface/pxe/pxe_udp.c
+++ b/src/arch/x86/interface/pxe/pxe_udp.c
@@ -328,7 +328,7 @@ pxenv_udp_write ( struct s_PXENV_UDP_WRITE *pxenv_udp_write ) {
 		pxenv_udp_write->Status = PXENV_STATUS_OUT_OF_RESOURCES;
 		return PXENV_EXIT_FAILURE;
 	}
-	buffer = real_to_user ( pxenv_udp_write->buffer.segment,
+	buffer = real_to_virt ( pxenv_udp_write->buffer.segment,
 				pxenv_udp_write->buffer.offset );
 	copy_from_user ( iob_put ( iobuf, len ), buffer, 0, len );
 
@@ -438,7 +438,7 @@ static PXENV_EXIT_t pxenv_udp_read ( struct s_PXENV_UDP_READ *pxenv_udp_read ) {
 	}
 
 	/* Copy packet to buffer and record length */
-	buffer = real_to_user ( pxenv_udp_read->buffer.segment,
+	buffer = real_to_virt ( pxenv_udp_read->buffer.segment,
 				pxenv_udp_read->buffer.offset );
 	len = iob_len ( iobuf );
 	if ( len > pxenv_udp_read->buffer_size )
diff --git a/src/arch/x86/interface/syslinux/comboot_call.c b/src/arch/x86/interface/syslinux/comboot_call.c
index d7e923b70..d8c245757 100644
--- a/src/arch/x86/interface/syslinux/comboot_call.c
+++ b/src/arch/x86/interface/syslinux/comboot_call.c
@@ -90,7 +90,7 @@ static uint16_t comboot_graphics_mode = 0;
 static void print_user_string ( unsigned int segment, unsigned int offset, char terminator ) {
 	int i = 0;
 	char c;
-	userptr_t str = real_to_user ( segment, offset );
+	userptr_t str = real_to_virt ( segment, offset );
 	for ( ; ; ) {
 		copy_from_user ( &c, str, i, 1 );
 		if ( c == terminator ) break;
@@ -109,7 +109,7 @@ static void shuffle ( unsigned int list_segment, unsigned int list_offset, unsig
 	unsigned int i;
 
 	/* Copy shuffle descriptor list so it doesn't get overwritten */
-	copy_from_user ( shuf, real_to_user ( list_segment, list_offset ), 0,
+	copy_from_user ( shuf, real_to_virt ( list_segment, list_offset ), 0,
 	                 count * sizeof( comboot_shuffle_descriptor ) );
 
 	/* Do the copies */
@@ -346,7 +346,7 @@ static __asmcall __used void int22 ( struct i386_all_regs *ix86 ) {
 
 	case 0x0003: /* Run command */
 		{
-			userptr_t cmd_u = real_to_user ( ix86->segs.es, ix86->regs.bx );
+			userptr_t cmd_u = real_to_virt ( ix86->segs.es, ix86->regs.bx );
 			int len = strlen ( cmd_u );
 			char cmd[len + 1];
 			copy_from_user ( cmd, cmd_u, 0, len + 1 );
@@ -370,7 +370,7 @@ static __asmcall __used void int22 ( struct i386_all_regs *ix86 ) {
 	case 0x0006: /* Open file */
 		{
 			int fd;
-			userptr_t file_u = real_to_user ( ix86->segs.es, ix86->regs.si );
+			userptr_t file_u = real_to_virt ( ix86->segs.es, ix86->regs.si );
 			int len = strlen ( file_u );
 			char file[len + 1];
 
@@ -410,7 +410,7 @@ static __asmcall __used void int22 ( struct i386_all_regs *ix86 ) {
 			int len = ix86->regs.cx * COMBOOT_FILE_BLOCKSZ;
 			int rc;
 			fd_set fds;
-			userptr_t buf = real_to_user ( ix86->segs.es, ix86->regs.bx );
+			userptr_t buf = real_to_virt ( ix86->segs.es, ix86->regs.bx );
 
 			/* Wait for data ready to read */
 			FD_ZERO ( &fds );
@@ -483,7 +483,7 @@ static __asmcall __used void int22 ( struct i386_all_regs *ix86 ) {
 
 	case 0x0010: /* Resolve hostname */
 		{
-			userptr_t hostname_u = real_to_user ( ix86->segs.es, ix86->regs.bx );
+			userptr_t hostname_u = real_to_virt ( ix86->segs.es, ix86->regs.bx );
 			int len = strlen ( hostname_u );
 			char hostname[len];
 			struct in_addr addr;
@@ -549,8 +549,8 @@ static __asmcall __used void int22 ( struct i386_all_regs *ix86 ) {
 
 	case 0x0016: /* Run kernel image */
 		{
-			userptr_t file_u = real_to_user ( ix86->segs.ds, ix86->regs.si );
-			userptr_t cmd_u = real_to_user ( ix86->segs.es, ix86->regs.bx );
+			userptr_t file_u = real_to_virt ( ix86->segs.ds, ix86->regs.si );
+			userptr_t cmd_u = real_to_virt ( ix86->segs.es, ix86->regs.bx );
 			int file_len = strlen ( file_u );
 			int cmd_len = strlen ( cmd_u );
 			char file[file_len + 1];
@@ -595,8 +595,8 @@ static __asmcall __used void int22 ( struct i386_all_regs *ix86 ) {
 		shuffle ( ix86->segs.es, ix86->regs.di, ix86->regs.cx );
 
 		/* Copy initial register values to .text16 */
-		memcpy ( real_to_user ( rm_cs, (unsigned) __from_text16 ( &comboot_initial_regs ) ),
-			 real_to_user ( ix86->segs.ds, ix86->regs.si ),
+		memcpy ( real_to_virt ( rm_cs, (unsigned) __from_text16 ( &comboot_initial_regs ) ),
+			 real_to_virt ( ix86->segs.ds, ix86->regs.si ),
 			 sizeof(syslinux_rm_regs) );
 
 		/* Load initial register values */
diff --git a/src/arch/x86/transitions/librm_mgmt.c b/src/arch/x86/transitions/librm_mgmt.c
index fbc653969..e0679f0ff 100644
--- a/src/arch/x86/transitions/librm_mgmt.c
+++ b/src/arch/x86/transitions/librm_mgmt.c
@@ -68,7 +68,7 @@ static struct profiler other_irq_profiler __profiler = { .name = "irq.other" };
 uint16_t copy_user_to_rm_stack ( userptr_t data, size_t size ) {
 	userptr_t rm_stack;
 	rm_sp -= size;
-	rm_stack = real_to_user ( rm_ss, rm_sp );
+	rm_stack = real_to_virt ( rm_ss, rm_sp );
 	memcpy ( rm_stack, data, size );
 	return rm_sp;
 };
@@ -82,7 +82,7 @@ uint16_t copy_user_to_rm_stack ( userptr_t data, size_t size ) {
  */
 void remove_user_from_rm_stack ( userptr_t data, size_t size ) {
 	if ( data ) {
-		userptr_t rm_stack = real_to_user ( rm_ss, rm_sp );
+		userptr_t rm_stack = real_to_virt ( rm_ss, rm_sp );
 		memcpy ( rm_stack, data, size );
 	}
 	rm_sp += size;