X-Git-Url: http://git.buserror.net/cgi-bin/gitweb.cgi?p=polintos%2Fscott%2Fpriv.git;a=blobdiff_plain;f=kernel%2Farch%2Fx86%2Fentry.S;h=3483893d93f4c9c642d7244bc493eff25cff6cf2;hp=f8cf68420facff66239e57ee1b6a7d1109683134;hb=0601614ebbcc48b961a2f0613281e6e629af29b1;hpb=292f369387f0b1018b3cfc59ad555698d75d6d46

diff --git a/kernel/arch/x86/entry.S b/kernel/arch/x86/entry.S
index f8cf684..3483893 100644
--- a/kernel/arch/x86/entry.S
+++ b/kernel/arch/x86/entry.S
@@ -139,10 +139,25 @@ no_pentium_str:
 
 no_multiboot_str:
 	.string "Unrecognized bootloader; a multiboot-compliant loader is required."
+
+	.macro	enterkernel, reg
+	pushl	%es
+	pushl	%ds
+	movl	$8, \reg
+	cld
+	movl	\reg, %ds
+	movl	\reg, %es
+	.endm
+	
+	.macro	exitkernel
+	popl	%ds
+	popl	%es
+	.endm
 	
 	.macro	pushvolatilesnoeax
 	pushl	%ecx
 	pushl	%edx
+	enterkernel %ecx
 	.endm
 	
 	.macro	pushvolatiles
@@ -151,6 +166,7 @@ no_multiboot_str:
 	.endm
 
 	.macro	popvolatiles
+	exitkernel
 	popl	%edx
 	popl	%ecx
 	popl	%eax
@@ -164,11 +180,11 @@ no_multiboot_str:
 	.macro	pushall
 	pushl	%esi
 	pushl	%ebp
-	pushl	%esp
 	pushl	%ebx
 	pushl	%edx
 	pushl	%ecx
 	pushl	%eax
+	enterkernel %esi
 	.endm
 	
 	.macro	pushallnoerr
@@ -177,11 +193,11 @@ no_multiboot_str:
 	.endm
 
 	.macro	popall
+	exitkernel
 	popl	%eax
 	popl	%ecx
 	popl	%edx
 	popl	%ebx
-	addl	$4, %esp
 	popl	%ebp
 	popl	%esi
 	popl	%edi
@@ -261,17 +277,44 @@ x86_page_fault:
 	popall
 	iret
 
+	.global x86_int98_entry
+x86_int98_entry:
+	pushl	$0
+	pushl	%eax
+	enterkernel %ecx
+
+	pushl	%esp
+	call	x86_invoke_method
+	addl	$4, %esp
+
+	exitkernel
+	popl	%eax
+	xorl	%ecx, %ecx
+	popl	%edx
+	xorl	%ebx, %ebx
+	xorl	%ebp, %ebp
+	xorl	%esi, %esi
+	xorl	%edi, %edi
+	iret
+
 	.global x86_int99_entry
 x86_int99_entry:
-	pushl	%edx
-	pushl	4(%esp)
-	pushl	%edx
 	pushl	%ecx
 	pushl	%eax
-	call	invoke_method
-	addl	$16, %esp
-	xorl	%ecx, %ecx
-	popl	%edx
+	enterkernel %edx
+
+	pushl	%esp
+	call	x86_return_from_method
+	addl	$4, %esp
+
+	exitkernel
+	popl	%eax
+	popl	%ecx
+	xorl	%edx, %edx
+	xorl	%ebx, %ebx
+	xorl	%ebp, %ebp
+	xorl	%esi, %esi
+	xorl	%edi, %edi
 	iret
 
 	.global	x86_irq
@@ -342,16 +385,47 @@ x86_new_thread:
 
 	.section ".roshared","x"
 	
-	// The syscall pointer must be the first thing in roshared
-	// (at vaddr 0x7fff0000), so that user code can make method
-	// invocations to find out where other stuff is.
+	// The vsyscall table must be the first thing in roshared (at
+	// vaddr 0x7fff0000).
+
+#define PTR(x) (x - x86_syscall_ptr + 0x7fff0000)
 	
 	.global x86_syscall_ptr
 x86_syscall_ptr:
-	.long	x86_shared_int99 - x86_syscall_ptr + 0x7fff0000
-	
-	.global x86_shared_int99
+	.long	PTR(x86_shared_int98)
+
+	.global	x86_sysret_ptr
+x86_sysret_ptr:
+	.long	PTR(x86_shared_int99)
+
+x86_shared_int98:
+	// FIXME: This must be unpreemptible by traps
+	pushl	%gs
+	pushl	%fs
+	pushl	%ebp
+	pushl	%edi
+	pushl	%esi
+	pushl	%ebx
+	int	$0x98
+	popl	%ebx
+	popl	%esi
+	popl	%edi
+	popl	%ebp
+	popl	%fs
+	popl	%gs
+	ret
+
 x86_shared_int99:
 	int	$0x99
-	// FIXME: search for exception handler
 	ret
+
+	.section ".rwshared",""
+
+	// Userspace must set this to an appropriate entry point
+	// prior to registering objects with the kernel.  It should
+	// not be modified while an object is registered (the kernel
+	// won't mind, but there's no mechanism to wait until no more
+	// upcalls to the old entry point are in progress).
+	.global	x86_upcall_entry
+x86_upcall_entry:
+	.long	0