From 2df96b34aae08e0aa688ef7a8444febb8ec44172 Mon Sep 17 00:00:00 2001
From: Nicolas Pitre <nico@cam.org>
Date: Fri, 13 Jan 2006 20:51:46 +0000
Subject: [ARM] 3259/1: remove phys_ram from struct machine_desc (part 1)

Patch from Nicolas Pitre

This field is redundent since it must be equal to PHYS_OFFSET anyway.

First, let's  use PHYS_OFFSET directly instead.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 arch/arm/kernel/head.S | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

(limited to 'arch/arm/kernel')

diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index 1e985f2cd70f..1aca1775b28f 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -251,12 +251,11 @@ __turn_mmu_on:
  * r10 = procinfo
  *
  * Returns:
- *  r0, r3, r5, r6, r7 corrupted
+ *  r0, r3, r6, r7 corrupted
  *  r4 = physical page table address
  */
 	.type	__create_page_tables, %function
 __create_page_tables:
-	ldr	r5, [r8, #MACHINFO_PHYSRAM]	@ physram
 	pgtbl	r4				@ page table address
 
 	/*
@@ -303,7 +302,7 @@ __create_page_tables:
 	 * Then map first 1MB of ram in case it contains our boot params.
 	 */
 	add	r0, r4, #PAGE_OFFSET >> 18
-	orr	r6, r5, r7
+	orr	r6, r7, #PHYS_OFFSET
 	str	r6, [r0]
 
 #ifdef CONFIG_XIP_KERNEL
@@ -311,7 +310,7 @@ __create_page_tables:
 	 * Map some ram to cover our .data and .bss areas.
 	 * Mapping 3MB should be plenty.
 	 */
-	sub	r3, r4, r5
+	sub	r3, r4, #PHYS_OFFSET
 	mov	r3, r3, lsr #20
 	add	r0, r0, r3, lsl #2
 	add	r6, r6, r3, lsl #20
-- 
cgit v1.2.2


From afeb90ca08000cbd75f22836e667f368e25fe3ac Mon Sep 17 00:00:00 2001
From: "Hyok S. Choi" <hyok.choi@samsung.com>
Date: Fri, 13 Jan 2006 21:05:25 +0000
Subject: [ARM] Support register switch in nommu mode

This patch adds register switch support in nommu mode.

Signed-off-by: Hyok S. Choi <hyok.choi@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 arch/arm/kernel/entry-armv.S | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'arch/arm/kernel')

diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index a52baedf6262..fb8e7f4c4b37 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -3,6 +3,7 @@
  *
  *  Copyright (C) 1996,1997,1998 Russell King.
  *  ARM700 fix by Matthew Godbolt (linux-user@willothewisp.demon.co.uk)
+ *  nommu support by Hyok S. Choi (hyok.choi@samsung.com)
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -538,7 +539,11 @@ ENTRY(__switch_to)
 	add	ip, r1, #TI_CPU_SAVE
 	ldr	r3, [r2, #TI_TP_VALUE]
 	stmia	ip!, {r4 - sl, fp, sp, lr}	@ Store most regs on stack
+#ifndef CONFIG_MMU
+	add	r2, r2, #TI_CPU_DOMAIN
+#else
 	ldr	r6, [r2, #TI_CPU_DOMAIN]!
+#endif
 #if __LINUX_ARM_ARCH__ >= 6
 #ifdef CONFIG_CPU_MPCORE
 	clrex
@@ -556,7 +561,9 @@ ENTRY(__switch_to)
 	mov	r4, #0xffff0fff
 	str	r3, [r4, #-15]			@ TLS val at 0xffff0ff0
 #endif
+#ifdef CONFIG_MMU
 	mcr	p15, 0, r6, c3, c0, 0		@ Set domain register
+#endif
 #ifdef CONFIG_VFP
 	@ Always disable VFP so we can lazily save/restore the old
 	@ state. This occurs in the context of the previous thread.
-- 
cgit v1.2.2


From 2dede2d8e925f4c2cb4e136b14df127685e15dd3 Mon Sep 17 00:00:00 2001
From: Nicolas Pitre <nico@cam.org>
Date: Sat, 14 Jan 2006 16:18:08 +0000
Subject: [ARM] 3102/1: ARM EABI: stack pointer must be 64-bit aligned after a
 CPU exception

Patch from Nicolas Pitre

The ARM EABI says that the stack pointer has to be 64-bit aligned for
reasons already mentioned in patch #3101 when calling C functions.

We therefore must verify and adjust sp accordingly when taking an
exception from kernel mode since sp might not necessarily be 64-bit
aligned if the exception occurs in the middle of a kernel function.

If the exception occurs while in user mode then no sp fixup is needed as
long as sizeof(struct pt_regs) as well as any additional syscall data
stack space remain multiples of 8.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 arch/arm/kernel/entry-armv.S   | 17 +++++++++++++++++
 arch/arm/kernel/entry-header.S |  1 +
 2 files changed, 18 insertions(+)

(limited to 'arch/arm/kernel')

diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index fb8e7f4c4b37..874e6bb79405 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -105,14 +105,24 @@ common_invalid:
 /*
  * SVC mode handlers
  */
+
+#if defined(CONFIG_AEABI) && (__LINUX_ARM_ARCH__ >= 5)
+#define SPFIX(code...) code
+#else
+#define SPFIX(code...)
+#endif
+
 	.macro	svc_entry
 	sub	sp, sp, #S_FRAME_SIZE
+ SPFIX(	tst	sp, #4		)
+ SPFIX(	bicne	sp, sp, #4	)
 	stmib	sp, {r1 - r12}
 
 	ldmia	r0, {r1 - r3}
 	add	r5, sp, #S_SP		@ here for interlock avoidance
 	mov	r4, #-1			@  ""  ""      ""       ""
 	add	r0, sp, #S_FRAME_SIZE   @  ""  ""      ""       ""
+ SPFIX(	addne	r0, r0, #4	)
 	str	r1, [sp]		@ save the "real" r0 copied
 					@ from the exception stack
 
@@ -303,7 +313,14 @@ __pabt_svc:
 
 /*
  * User mode handlers
+ *
+ * EABI note: sp_svc is always 64-bit aligned here, so should S_FRAME_SIZE
  */
+
+#if defined(CONFIG_AEABI) && (__LINUX_ARM_ARCH__ >= 5) && (S_FRAME_SIZE & 7)
+#error "sizeof(struct pt_regs) must be a multiple of 8"
+#endif
+
 	.macro	usr_entry
 	sub	sp, sp, #S_FRAME_SIZE
 	stmib	sp, {r1 - r12}
diff --git a/arch/arm/kernel/entry-header.S b/arch/arm/kernel/entry-header.S
index 648cfff93138..55c99cdab7d6 100644
--- a/arch/arm/kernel/entry-header.S
+++ b/arch/arm/kernel/entry-header.S
@@ -19,6 +19,7 @@
 @
 @ Most of the stack format comes from struct pt_regs, but with
 @ the addition of 8 bytes for storing syscall args 5 and 6.
+@ This _must_ remain a multiple of 8 for EABI.
 @
 #define S_OFF		8
 
-- 
cgit v1.2.2


From 499b2ea11ff00c624d63af23516404fa2156639a Mon Sep 17 00:00:00 2001
From: Nicolas Pitre <nico@cam.org>
Date: Sat, 14 Jan 2006 16:18:09 +0000
Subject: [ARM] 3103/1: ARM EABI: stack pointer must be 64-bit aligned (part 2)

Patch from Nicolas Pitre

We must make sure that assembly code that modifies the stack pointer
before calling a C function does it so it remains 64-bit aligned.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 arch/arm/kernel/semaphore.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

(limited to 'arch/arm/kernel')

diff --git a/arch/arm/kernel/semaphore.c b/arch/arm/kernel/semaphore.c
index 4c31f2923055..981fe5c6ccbe 100644
--- a/arch/arm/kernel/semaphore.c
+++ b/arch/arm/kernel/semaphore.c
@@ -177,41 +177,42 @@ int __down_trylock(struct semaphore * sem)
  * ip contains the semaphore pointer on entry. Save the C-clobbered
  * registers (r0 to r3 and lr), but not ip, as we use it as a return
  * value in some cases..
+ * To remain AAPCS compliant (64-bit stack align) we save r4 as well.
  */
 asm("	.section .sched.text,\"ax\",%progbits	\n\
 	.align	5				\n\
 	.globl	__down_failed			\n\
 __down_failed:					\n\
-	stmfd	sp!, {r0 - r3, lr}		\n\
+	stmfd	sp!, {r0 - r4, lr}		\n\
 	mov	r0, ip				\n\
 	bl	__down				\n\
-	ldmfd	sp!, {r0 - r3, pc}		\n\
+	ldmfd	sp!, {r0 - r4, pc}		\n\
 						\n\
 	.align	5				\n\
 	.globl	__down_interruptible_failed	\n\
 __down_interruptible_failed:			\n\
-	stmfd	sp!, {r0 - r3, lr}		\n\
+	stmfd	sp!, {r0 - r4, lr}		\n\
 	mov	r0, ip				\n\
 	bl	__down_interruptible		\n\
 	mov	ip, r0				\n\
-	ldmfd	sp!, {r0 - r3, pc}		\n\
+	ldmfd	sp!, {r0 - r4, pc}		\n\
 						\n\
 	.align	5				\n\
 	.globl	__down_trylock_failed		\n\
 __down_trylock_failed:				\n\
-	stmfd	sp!, {r0 - r3, lr}		\n\
+	stmfd	sp!, {r0 - r4, lr}		\n\
 	mov	r0, ip				\n\
 	bl	__down_trylock			\n\
 	mov	ip, r0				\n\
-	ldmfd	sp!, {r0 - r3, pc}		\n\
+	ldmfd	sp!, {r0 - r4, pc}		\n\
 						\n\
 	.align	5				\n\
 	.globl	__up_wakeup			\n\
 __up_wakeup:					\n\
-	stmfd	sp!, {r0 - r3, lr}		\n\
+	stmfd	sp!, {r0 - r4, lr}		\n\
 	mov	r0, ip				\n\
 	bl	__up				\n\
-	ldmfd	sp!, {r0 - r3, pc}		\n\
+	ldmfd	sp!, {r0 - r4, pc}		\n\
 	");
 
 EXPORT_SYMBOL(__down_failed);
-- 
cgit v1.2.2


From ba95e4e4a0a8a3c6aba363d45f78d5f2e2d111eb Mon Sep 17 00:00:00 2001
From: Nicolas Pitre <nico@cam.org>
Date: Sat, 14 Jan 2006 16:18:29 +0000
Subject: [ARM] 3104/1: ARM EABI: new helper function names

Patch from Nicolas Pitre

The ARM EABI defines new names for GCC helper functions.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 arch/arm/kernel/armksyms.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'arch/arm/kernel')

diff --git a/arch/arm/kernel/armksyms.c b/arch/arm/kernel/armksyms.c
index 9997098009a9..1574941ebfe1 100644
--- a/arch/arm/kernel/armksyms.c
+++ b/arch/arm/kernel/armksyms.c
@@ -35,6 +35,16 @@ extern void __udivsi3(void);
 extern void __umodsi3(void);
 extern void __do_div64(void);
 
+extern void __aeabi_idiv(void);
+extern void __aeabi_idivmod(void);
+extern void __aeabi_lasr(void);
+extern void __aeabi_llsl(void);
+extern void __aeabi_llsr(void);
+extern void __aeabi_lmul(void);
+extern void __aeabi_uidiv(void);
+extern void __aeabi_uidivmod(void);
+extern void __aeabi_ulcmp(void);
+
 extern void fpundefinstr(void);
 extern void fp_enter(void);
 
@@ -141,6 +151,18 @@ EXPORT_SYMBOL(__udivsi3);
 EXPORT_SYMBOL(__umodsi3);
 EXPORT_SYMBOL(__do_div64);
 
+#ifdef CONFIG_AEABI
+EXPORT_SYMBOL(__aeabi_idiv);
+EXPORT_SYMBOL(__aeabi_idivmod);
+EXPORT_SYMBOL(__aeabi_lasr);
+EXPORT_SYMBOL(__aeabi_llsl);
+EXPORT_SYMBOL(__aeabi_llsr);
+EXPORT_SYMBOL(__aeabi_lmul);
+EXPORT_SYMBOL(__aeabi_uidiv);
+EXPORT_SYMBOL(__aeabi_uidivmod);
+EXPORT_SYMBOL(__aeabi_ulcmp);
+#endif
+
 	/* bitops */
 EXPORT_SYMBOL(_set_bit_le);
 EXPORT_SYMBOL(_test_and_set_bit_le);
-- 
cgit v1.2.2


From 3f2829a31573e3e502b874c8d69a765f7a778793 Mon Sep 17 00:00:00 2001
From: Nicolas Pitre <nico@cam.org>
Date: Sat, 14 Jan 2006 16:31:29 +0000
Subject: [ARM] 3105/4: ARM EABI: new syscall entry convention

Patch from Nicolas Pitre

For a while we wanted to change the way syscalls were called on ARM.
Instead of encoding the syscall number in the swi instruction which
requires reading back the instruction from memory to extract that number
and polluting the data cache, it was decided that simply storing the
syscall number into r7 would be more efficient. Since this represents
an ABI change then making that change at the same time as EABI support
is the right thing to do.

It is now expected that EABI user space binaries put the syscall number
into r7 and use "swi 0" to call the kernel. Syscall register argument
are also expected to have "EABI arrangement" i.e. 64-bit arguments
should be put in a pair of registers from an even register number.

Example with long ftruncate64(unsigned int fd, loff_t length):

	legacy ABI:
	- put fd into r0
	- put length into r1-r2
	- use "swi #(0x900000 + 194)" to call the kernel

	new ARM EABI:
	- put fd into r0
	- put length into r2-r3 (skipping over r1)
	- put 194 into r7
	- use "swi 0" to call the kernel

Note that it is important to use 0 for the swi argument as backward
compatibility with legacy ABI user space relies on this.
The syscall macros in asm-arm/unistd.h were also updated to support
both ABIs and implement the right call method automatically.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 arch/arm/kernel/entry-common.S | 35 +++++++++++++++++++++--------------
 arch/arm/kernel/traps.c        |  2 +-
 2 files changed, 22 insertions(+), 15 deletions(-)

(limited to 'arch/arm/kernel')

diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index e2b42997ad33..34826bcceb7a 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -98,20 +98,14 @@ ENTRY(ret_from_fork)
 	   run on an ARM7 and we can save a couple of instructions.  
 								--pb */
 #ifdef CONFIG_CPU_ARM710
-	.macro	arm710_bug_check, instr, temp
-	and	\temp, \instr, #0x0f000000	@ check for SWI
-	teq	\temp, #0x0f000000
-	bne	.Larm700bug
-	.endm
-
-.Larm700bug:
+#define A710(code...) code
+.Larm710bug:
 	ldmia	sp, {r0 - lr}^			@ Get calling r0 - lr
 	mov	r0, r0
 	add	sp, sp, #S_FRAME_SIZE
 	subs	pc, lr, #4
 #else
-	.macro	arm710_bug_check, instr, temp
-	.endm
+#define A710(code...)
 #endif
 
 	.align	5
@@ -129,14 +123,24 @@ ENTRY(vector_swi)
 	/*
 	 * Get the system call number.
 	 */
-#ifdef CONFIG_ARM_THUMB
+#if defined(CONFIG_AEABI)
+
+	@ syscall number is in scno (r7) already.
+
+  A710(	ldr	ip, [lr, #-4]			@ get SWI instruction	)
+  A710(	and	ip, ip, #0x0f000000		@ check for SWI		)
+  A710(	teq	ip, #0x0f000000						)
+  A710(	bne	.Larm710bug						)
+#elif defined(CONFIG_ARM_THUMB)
 	tst	r8, #PSR_T_BIT			@ this is SPSR from save_user_regs
 	addne	scno, r7, #__NR_SYSCALL_BASE	@ put OS number in
 	ldreq	scno, [lr, #-4]
 #else
 	ldr	scno, [lr, #-4]			@ get SWI instruction
+  A710(	and	ip, scno, #0x0f000000		@ check for SWI		)
+  A710(	teq	ip, #0x0f000000						)
+  A710(	bne	.Larm710bug						)
 #endif
-	arm710_bug_check scno, ip
 
 #ifdef CONFIG_ALIGNMENT_TRAP
 	ldr	ip, __cr_alignment
@@ -145,18 +149,19 @@ ENTRY(vector_swi)
 #endif
 	enable_irq
 
-	stmdb	sp!, {r4, r5}			@ push fifth and sixth args
-
 	get_thread_info tsk
 	ldr	ip, [tsk, #TI_FLAGS]		@ check for syscall tracing
+#ifndef CONFIG_AEABI
 	bic	scno, scno, #0xff000000		@ mask off SWI op-code
 	eor	scno, scno, #__NR_SYSCALL_BASE	@ check OS number
+#endif
 	adr	tbl, sys_call_table		@ load syscall table pointer
+	stmdb	sp!, {r4, r5}			@ push fifth and sixth args
 	tst	ip, #_TIF_SYSCALL_TRACE		@ are we tracing syscalls?
 	bne	__sys_trace
 
-	adr	lr, ret_fast_syscall		@ return address
 	cmp	scno, #NR_syscalls		@ check upper syscall limit
+	adr	lr, ret_fast_syscall		@ return address
 	ldrcc	pc, [tbl, scno, lsl #2]		@ call sys_* routine
 
 	add	r1, sp, #S_OFF
@@ -207,6 +212,7 @@ ENTRY(sys_call_table)
 @ r8 = syscall table
 		.type	sys_syscall, #function
 sys_syscall:
+#ifndef CONFIG_AEABI
 		eor	scno, r0, #__NR_SYSCALL_BASE
 		cmp	scno, #__NR_syscall - __NR_SYSCALL_BASE
 		cmpne	scno, #NR_syscalls	@ check range
@@ -216,6 +222,7 @@ sys_syscall:
 		movlo	r2, r3
 		movlo	r3, r4
 		ldrlo	pc, [tbl, scno, lsl #2]
+#endif
 		b	sys_ni_syscall
 
 sys_fork_wrapper:
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 93cfd3ffcc72..10235b01582e 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -404,7 +404,7 @@ asmlinkage int arm_syscall(int no, struct pt_regs *regs)
 	struct thread_info *thread = current_thread_info();
 	siginfo_t info;
 
-	if ((no >> 16) != 0x9f)
+	if ((no >> 16) != (__ARM_NR_BASE>> 16))
 		return bad_syscall(no, regs);
 
 	switch (no & 0xffff) {
-- 
cgit v1.2.2


From 713c481519f19df9e6d90f257e7da0336b057592 Mon Sep 17 00:00:00 2001
From: Nicolas Pitre <nico@cam.org>
Date: Sat, 14 Jan 2006 16:35:03 +0000
Subject: [ARM] 3108/2: old ABI compat: statfs64 and fstatfs64

Patch from Nicolas Pitre

struct statfs64 has extra padding with EABI growing its size from 84 to
88. This struct is now __attribute__((packed,aligned(4))) with a small
assembly wrapper to force the sz argument to 84 if it is 88 to avoid
copying the extra padding over user space memory unexpecting it.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 arch/arm/kernel/calls.S        |  4 ++--
 arch/arm/kernel/entry-common.S | 10 ++++++++++
 2 files changed, 12 insertions(+), 2 deletions(-)

(limited to 'arch/arm/kernel')

diff --git a/arch/arm/kernel/calls.S b/arch/arm/kernel/calls.S
index 55076a75e5bf..8c0bf04814b1 100644
--- a/arch/arm/kernel/calls.S
+++ b/arch/arm/kernel/calls.S
@@ -280,8 +280,8 @@ __syscall_start:
 		.long	sys_clock_gettime
 		.long	sys_clock_getres
 /* 265 */	.long	sys_clock_nanosleep
-		.long	sys_statfs64
-		.long	sys_fstatfs64
+		.long	sys_statfs64_wrapper
+		.long	sys_fstatfs64_wrapper
 		.long	sys_tgkill
 		.long	sys_utimes
 /* 270 */	.long	sys_arm_fadvise64_64
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 34826bcceb7a..ee63ee78d84f 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -262,6 +262,16 @@ sys_sigaltstack_wrapper:
 		ldr	r2, [sp, #S_OFF + S_SP]
 		b	do_sigaltstack
 
+sys_statfs64_wrapper:
+		teq	r1, #88
+		moveq	r1, #84
+		b	sys_statfs64
+
+sys_fstatfs64_wrapper:
+		teq	r1, #88
+		moveq	r1, #84
+		b	sys_fstatfs64
+
 /*
  * Note: off_4k (r5) is always units of 4K.  If we can't do the requested
  * offset, we return EINVAL.
-- 
cgit v1.2.2


From 687ad0191488a067b3b3cc94f670cc21f93811e1 Mon Sep 17 00:00:00 2001
From: Nicolas Pitre <nico@cam.org>
Date: Sat, 14 Jan 2006 16:35:31 +0000
Subject: [ARM] 3109/1: old ABI compat: syscall wrappers for ABI impedance
 matching

Patch from Nicolas Pitre

The difference between EABI and the legacy ABI may affect either
structure member alignment and/or argument register selection.

The patch has the details.

Included are wrappers for the following syscalls:

  sys_stat64
  sys_lstat64
  sys_fstat64
  sys_fcntl64
  sys_epoll_ctl
  sys_epoll_wait
  sys_ipc
  sys_semop
  sys_semtimedop
  sys_pread64
  sys_pwrite64
  sys_truncate64
  sys_ftruncate64
  sys_readahead

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 arch/arm/kernel/Makefile          |   1 +
 arch/arm/kernel/entry-common.S    |  32 ++++
 arch/arm/kernel/sys_oabi-compat.c | 339 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 372 insertions(+)
 create mode 100644 arch/arm/kernel/sys_oabi-compat.c

(limited to 'arch/arm/kernel')

diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index de94b0f3ee2a..2ce0e3a27a45 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_ARTHUR)		+= arthur.o
 obj-$(CONFIG_ISA_DMA)		+= dma-isa.o
 obj-$(CONFIG_PCI)		+= bios32.o
 obj-$(CONFIG_SMP)		+= smp.o
+obj-$(CONFIG_OABI_COMPAT)	+= sys_oabi-compat.o
 
 obj-$(CONFIG_IWMMXT)		+= iwmmxt.o
 AFLAGS_iwmmxt.o			:= -Wa,-mcpu=iwmmxt
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index ee63ee78d84f..59ce1bcec42b 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -288,3 +288,35 @@ sys_mmap2:
 		str	r5, [sp, #4]
 		b	do_mmap2
 #endif
+
+#ifdef CONFIG_OABI_COMPAT
+/*
+ * These are syscalls with argument register differences
+ */
+
+sys_oabi_pread64:
+		stmia	sp, {r3, r4}
+		b	sys_pread64
+
+sys_oabi_pwrite64:
+		stmia	sp, {r3, r4}
+		b	sys_pwrite64
+
+sys_oabi_truncate64:
+		mov	r3, r2
+		mov	r2, r1
+		b	sys_truncate64
+
+sys_oabi_ftruncate64:
+		mov	r3, r2
+		mov	r2, r1
+		b	sys_ftruncate64
+
+sys_oabi_readahead:
+		str	r3, [sp]
+		mov	r3, r2
+		mov	r2, r1
+		b	sys_readahead
+
+#endif
+
diff --git a/arch/arm/kernel/sys_oabi-compat.c b/arch/arm/kernel/sys_oabi-compat.c
new file mode 100644
index 000000000000..eafa8e5284af
--- /dev/null
+++ b/arch/arm/kernel/sys_oabi-compat.c
@@ -0,0 +1,339 @@
+/*
+ *  arch/arm/kernel/sys_oabi-compat.c
+ *
+ *  Compatibility wrappers for syscalls that are used from
+ *  old ABI user space binaries with an EABI kernel.
+ *
+ *  Author:	Nicolas Pitre
+ *  Created:	Oct 7, 2005
+ *  Copyright:	MontaVista Software, Inc.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ */
+
+/*
+ * The legacy ABI and the new ARM EABI have different rules making some
+ * syscalls incompatible especially with structure arguments.
+ * Most notably, Eabi says 64-bit members should be 64-bit aligned instead of
+ * simply word aligned.  EABI also pads structures to the size of the largest
+ * member it contains instead of the invariant 32-bit.
+ *
+ * The following syscalls are affected:
+ *
+ * sys_stat64:
+ * sys_lstat64:
+ * sys_fstat64:
+ *
+ *   struct stat64 has different sizes and some members are shifted
+ *   Compatibility wrappers are needed for them and provided below.
+ *
+ * sys_fcntl64:
+ *
+ *   struct flock64 has different sizes and some members are shifted
+ *   A compatibility wrapper is needed and provided below.
+ *
+ * sys_statfs64:
+ * sys_fstatfs64:
+ *
+ *   struct statfs64 has extra padding with EABI growing its size from
+ *   84 to 88.  This struct is now __attribute__((packed,aligned(4)))
+ *   with a small assembly wrapper to force the sz argument to 84 if it is 88
+ *   to avoid copying the extra padding over user space unexpecting it.
+ *
+ * sys_newuname:
+ *
+ *   struct new_utsname has no padding with EABI.  No problem there.
+ *
+ * sys_epoll_ctl:
+ * sys_epoll_wait:
+ *
+ *   struct epoll_event has its second member shifted also affecting the
+ *   structure size. Compatibility wrappers are needed and provided below.
+ *
+ * sys_ipc:
+ * sys_semop:
+ * sys_semtimedop:
+ *
+ *   struct sembuf loses its padding with EABI.  Since arrays of them are
+ *   used they have to be copyed to remove the padding. Compatibility wrappers
+ *   provided below.
+ */
+
+#include <linux/syscalls.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/fcntl.h>
+#include <linux/eventpoll.h>
+#include <linux/sem.h>
+#include <asm/ipc.h>
+#include <asm/uaccess.h>
+
+struct oldabi_stat64 {
+	unsigned long long st_dev;
+	unsigned int	__pad1;
+	unsigned long	__st_ino;
+	unsigned int	st_mode;
+	unsigned int	st_nlink;
+
+	unsigned long	st_uid;
+	unsigned long	st_gid;
+
+	unsigned long long st_rdev;
+	unsigned int	__pad2;
+
+	long long	st_size;
+	unsigned long	st_blksize;
+	unsigned long long st_blocks;
+
+	unsigned long	st_atime;
+	unsigned long	st_atime_nsec;
+
+	unsigned long	st_mtime;
+	unsigned long	st_mtime_nsec;
+
+	unsigned long	st_ctime;
+	unsigned long	st_ctime_nsec;
+
+	unsigned long long st_ino;
+} __attribute__ ((packed,aligned(4)));
+
+static long cp_oldabi_stat64(struct kstat *stat,
+			     struct oldabi_stat64 __user *statbuf)
+{
+	struct oldabi_stat64 tmp;
+
+	tmp.st_dev = huge_encode_dev(stat->dev);
+	tmp.__pad1 = 0;
+	tmp.__st_ino = stat->ino;
+	tmp.st_mode = stat->mode;
+	tmp.st_nlink = stat->nlink;
+	tmp.st_uid = stat->uid;
+	tmp.st_gid = stat->gid;
+	tmp.st_rdev = huge_encode_dev(stat->rdev);
+	tmp.st_size = stat->size;
+	tmp.st_blocks = stat->blocks;
+	tmp.__pad2 = 0;
+	tmp.st_blksize = stat->blksize;
+	tmp.st_atime = stat->atime.tv_sec;
+	tmp.st_atime_nsec = stat->atime.tv_nsec;
+	tmp.st_mtime = stat->mtime.tv_sec;
+	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
+	tmp.st_ctime = stat->ctime.tv_sec;
+	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
+	tmp.st_ino = stat->ino;
+	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
+}
+
+asmlinkage long sys_oabi_stat64(char __user * filename,
+				struct oldabi_stat64 __user * statbuf)
+{
+	struct kstat stat;
+	int error = vfs_stat(filename, &stat);
+	if (!error)
+		error = cp_oldabi_stat64(&stat, statbuf);
+	return error;
+}
+
+asmlinkage long sys_oabi_lstat64(char __user * filename,
+				 struct oldabi_stat64 __user * statbuf)
+{
+	struct kstat stat;
+	int error = vfs_lstat(filename, &stat);
+	if (!error)
+		error = cp_oldabi_stat64(&stat, statbuf);
+	return error;
+}
+
+asmlinkage long sys_oabi_fstat64(unsigned long fd,
+				 struct oldabi_stat64 __user * statbuf)
+{
+	struct kstat stat;
+	int error = vfs_fstat(fd, &stat);
+	if (!error)
+		error = cp_oldabi_stat64(&stat, statbuf);
+	return error;
+}
+
+struct oabi_flock64 {
+	short	l_type;
+	short	l_whence;
+	loff_t	l_start;
+	loff_t	l_len;
+	pid_t	l_pid;
+} __attribute__ ((packed,aligned(4)));
+
+asmlinkage long sys_oabi_fcntl64(unsigned int fd, unsigned int cmd,
+				 unsigned long arg)
+{
+	struct oabi_flock64 user;
+	struct flock64 kernel;
+	mm_segment_t fs = USER_DS; /* initialized to kill a warning */
+	unsigned long local_arg = arg;
+	int ret;
+
+	switch (cmd) {
+	case F_GETLK64:
+	case F_SETLK64:
+	case F_SETLKW64:
+		if (copy_from_user(&user, (struct oabi_flock64 __user *)arg,
+				   sizeof(user)))
+			return -EFAULT;
+		kernel.l_type	= user.l_type;
+		kernel.l_whence	= user.l_whence;
+		kernel.l_start	= user.l_start;
+		kernel.l_len	= user.l_len;
+		kernel.l_pid	= user.l_pid;
+		local_arg = (unsigned long)&kernel;
+		fs = get_fs();
+		set_fs(KERNEL_DS);
+	}
+
+	ret = sys_fcntl64(fd, cmd, local_arg);
+
+	switch (cmd) {
+	case F_GETLK64:
+		if (!ret) {
+			user.l_type	= kernel.l_type;
+			user.l_whence	= kernel.l_whence;
+			user.l_start	= kernel.l_start;
+			user.l_len	= kernel.l_len;
+			user.l_pid	= kernel.l_pid;
+			if (copy_to_user((struct oabi_flock64 __user *)arg,
+					 &user, sizeof(user)))
+				ret = -EFAULT;
+		}
+	case F_SETLK64:
+	case F_SETLKW64:
+		set_fs(fs);
+	}
+
+	return ret;
+}
+
+struct oabi_epoll_event {
+	__u32 events;
+	__u64 data;
+} __attribute__ ((packed,aligned(4)));
+
+asmlinkage long sys_oabi_epoll_ctl(int epfd, int op, int fd,
+				   struct oabi_epoll_event __user *event)
+{
+	struct oabi_epoll_event user;
+	struct epoll_event kernel;
+	mm_segment_t fs;
+	long ret;
+
+	if (op == EPOLL_CTL_DEL)
+		return sys_epoll_ctl(epfd, op, fd, NULL);
+	if (copy_from_user(&user, event, sizeof(user)))
+		return -EFAULT;
+	kernel.events = user.events;
+	kernel.data   = user.data;
+	fs = get_fs();
+	set_fs(KERNEL_DS);
+	ret = sys_epoll_ctl(epfd, op, fd, &kernel);
+	set_fs(fs);
+	return ret;
+}
+
+asmlinkage long sys_oabi_epoll_wait(int epfd,
+				    struct oabi_epoll_event __user *events,
+				    int maxevents, int timeout)
+{
+	struct epoll_event *kbuf;
+	mm_segment_t fs;
+	long ret, err, i;
+
+	if (maxevents <= 0 || maxevents > (INT_MAX/sizeof(struct epoll_event)))
+		return -EINVAL;
+	kbuf = kmalloc(sizeof(*kbuf) * maxevents, GFP_KERNEL);
+	if (!kbuf)
+		return -ENOMEM;
+	fs = get_fs();
+	set_fs(KERNEL_DS);
+	ret = sys_epoll_wait(epfd, kbuf, maxevents, timeout);
+	set_fs(fs);
+	err = 0;
+	for (i = 0; i < ret; i++) {
+		__put_user_error(kbuf[i].events, &events->events, err);
+		__put_user_error(kbuf[i].data,   &events->data,   err);
+		events++;
+	}
+	kfree(kbuf);
+	return err ? -EFAULT : ret;
+}
+
+struct oabi_sembuf {
+	unsigned short	sem_num;
+	short		sem_op;
+	short		sem_flg;
+	unsigned short	__pad;
+};
+
+asmlinkage long sys_oabi_semtimedop(int semid,
+				    struct oabi_sembuf __user *tsops,
+				    unsigned nsops,
+				    const struct timespec __user *timeout)
+{
+	struct sembuf *sops;
+	struct timespec local_timeout;
+	long err;
+	int i;
+
+	if (nsops < 1)
+		return -EINVAL;
+	sops = kmalloc(sizeof(*sops) * nsops, GFP_KERNEL);
+	if (!sops)
+		return -ENOMEM;
+	err = 0;
+	for (i = 0; i < nsops; i++) {
+		__get_user_error(sops[i].sem_num, &tsops->sem_num, err);
+		__get_user_error(sops[i].sem_op,  &tsops->sem_op,  err);
+		__get_user_error(sops[i].sem_flg, &tsops->sem_flg, err);
+		tsops++;
+	}
+	if (timeout) {
+		/* copy this as well before changing domain protection */
+		err |= copy_from_user(&local_timeout, timeout, sizeof(*timeout));
+		timeout = &local_timeout;
+	}
+	if (err) {
+		err = -EFAULT;
+	} else {
+		mm_segment_t fs = get_fs();
+		set_fs(KERNEL_DS);
+		err = sys_semtimedop(semid, sops, nsops, timeout);
+		set_fs(fs);
+	}
+	kfree(sops);
+	return err;
+}
+
+asmlinkage long sys_oabi_semop(int semid, struct oabi_sembuf __user *tsops,
+			       unsigned nsops)
+{
+	return sys_oabi_semtimedop(semid, tsops, nsops, NULL);
+}
+
+extern asmlinkage int sys_ipc(uint call, int first, int second, int third,
+			      void __user *ptr, long fifth);
+
+asmlinkage int sys_oabi_ipc(uint call, int first, int second, int third,
+			    void __user *ptr, long fifth)
+{
+	switch (call & 0xffff) {
+	case SEMOP:
+		return  sys_oabi_semtimedop(first,
+					    (struct oabi_sembuf __user *)ptr,
+					    second, NULL);
+	case SEMTIMEDOP:
+		return  sys_oabi_semtimedop(first,
+					    (struct oabi_sembuf __user *)ptr,
+					    second,
+					    (const struct timespec __user *)fifth);
+	default:
+		return sys_ipc(call, first, second, third, ptr, fifth);
+	}
+}
-- 
cgit v1.2.2


From dd35afc22b76766e827c9e67ebc4b7bf6e31ecab Mon Sep 17 00:00:00 2001
From: Nicolas Pitre <nico@cam.org>
Date: Sat, 14 Jan 2006 16:36:12 +0000
Subject: [ARM] 3110/5: old ABI compat: multi-ABI syscall entry support

Patch from Nicolas Pitre

This patch adds the required code to support both user space ABIs at
the same time. A second syscall table is created to include legacy ABI
syscalls that need an ABI compat wrapper.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 arch/arm/kernel/calls.S        | 55 +++++++++++++++--------------
 arch/arm/kernel/entry-common.S | 78 ++++++++++++++++++++++++++++++++++++++----
 arch/arm/kernel/sys_arm.c      |  2 ++
 3 files changed, 100 insertions(+), 35 deletions(-)

(limited to 'arch/arm/kernel')

diff --git a/arch/arm/kernel/calls.S b/arch/arm/kernel/calls.S
index 8c0bf04814b1..75e6f9a94713 100644
--- a/arch/arm/kernel/calls.S
+++ b/arch/arm/kernel/calls.S
@@ -13,7 +13,7 @@
 #define NR_syscalls 328
 #else
 
-__syscall_start:
+100:
 /* 0 */		.long	sys_restart_syscall
 		.long	sys_exit
 		.long	sys_fork_wrapper
@@ -27,7 +27,7 @@ __syscall_start:
 /* 10 */	.long	sys_unlink
 		.long	sys_execve_wrapper
 		.long	sys_chdir
-		.long	sys_time		/* used by libc4 */
+		.long	OBSOLETE(sys_time)	/* used by libc4 */
 		.long	sys_mknod
 /* 15 */	.long	sys_chmod
 		.long	sys_lchown16
@@ -36,15 +36,15 @@ __syscall_start:
 		.long	sys_lseek
 /* 20 */	.long	sys_getpid
 		.long	sys_mount
-		.long	sys_oldumount		/* used by libc4 */
+		.long	OBSOLETE(sys_oldumount)	/* used by libc4 */
 		.long	sys_setuid16
 		.long	sys_getuid16
-/* 25 */	.long	sys_stime
+/* 25 */	.long	OBSOLETE(sys_stime)
 		.long	sys_ptrace
-		.long	sys_alarm		/* used by libc4 */
+		.long	OBSOLETE(sys_alarm)	/* used by libc4 */
 		.long	sys_ni_syscall		/* was sys_fstat */
 		.long	sys_pause
-/* 30 */	.long	sys_utime		/* used by libc4 */
+/* 30 */	.long	OBSOLETE(sys_utime)	/* used by libc4 */
 		.long	sys_ni_syscall		/* was sys_stty */
 		.long	sys_ni_syscall		/* was sys_getty */
 		.long	sys_access
@@ -90,21 +90,21 @@ __syscall_start:
 		.long	sys_sigpending
 		.long	sys_sethostname
 /* 75 */	.long	sys_setrlimit
-		.long	sys_old_getrlimit	/* used by libc4 */
+		.long	OBSOLETE(sys_old_getrlimit) /* used by libc4 */
 		.long	sys_getrusage
 		.long	sys_gettimeofday
 		.long	sys_settimeofday
 /* 80 */	.long	sys_getgroups16
 		.long	sys_setgroups16
-		.long	old_select		/* used by libc4 */
+		.long	OBSOLETE(old_select)	/* used by libc4 */
 		.long	sys_symlink
 		.long	sys_ni_syscall		/* was sys_lstat */
 /* 85 */	.long	sys_readlink
 		.long	sys_uselib
 		.long	sys_swapon
 		.long	sys_reboot
-		.long	old_readdir		/* used by libc4 */
-/* 90 */	.long	old_mmap		/* used by libc4 */
+		.long	OBSOLETE(old_readdir)	/* used by libc4 */
+/* 90 */	.long	OBSOLETE(old_mmap)	/* used by libc4 */
 		.long	sys_munmap
 		.long	sys_truncate
 		.long	sys_ftruncate
@@ -116,7 +116,7 @@ __syscall_start:
 		.long	sys_statfs
 /* 100 */	.long	sys_fstatfs
 		.long	sys_ni_syscall
-		.long	sys_socketcall
+		.long	OBSOLETE(sys_socketcall)
 		.long	sys_syslog
 		.long	sys_setitimer
 /* 105 */	.long	sys_getitimer
@@ -127,11 +127,11 @@ __syscall_start:
 /* 110 */	.long	sys_ni_syscall		/* was sys_iopl */
 		.long	sys_vhangup
 		.long	sys_ni_syscall
-		.long	sys_syscall		/* call a syscall */
+		.long	OBSOLETE(sys_syscall)	/* call a syscall */
 		.long	sys_wait4
 /* 115 */	.long	sys_swapoff
 		.long	sys_sysinfo
-		.long	sys_ipc
+		.long	OBSOLETE(ABI(sys_ipc, sys_oabi_ipc))
 		.long	sys_fsync
 		.long	sys_sigreturn_wrapper
 /* 120 */	.long	sys_clone_wrapper
@@ -194,8 +194,8 @@ __syscall_start:
 		.long	sys_rt_sigtimedwait
 		.long	sys_rt_sigqueueinfo
 		.long	sys_rt_sigsuspend_wrapper
-/* 180 */	.long	sys_pread64
-		.long	sys_pwrite64
+/* 180 */	.long	ABI(sys_pread64, sys_oabi_pread64)
+		.long	ABI(sys_pwrite64, sys_oabi_pwrite64)
 		.long	sys_chown16
 		.long	sys_getcwd
 		.long	sys_capget
@@ -207,11 +207,11 @@ __syscall_start:
 /* 190 */	.long	sys_vfork_wrapper
 		.long	sys_getrlimit
 		.long	sys_mmap2
-		.long	sys_truncate64
-		.long	sys_ftruncate64
-/* 195 */	.long	sys_stat64
-		.long	sys_lstat64
-		.long	sys_fstat64
+		.long	ABI(sys_truncate64, sys_oabi_truncate64)
+		.long	ABI(sys_ftruncate64, sys_oabi_ftruncate64)
+/* 195 */	.long	ABI(sys_stat64, sys_oabi_stat64)
+		.long	ABI(sys_lstat64, sys_oabi_lstat64)
+		.long	ABI(sys_fstat64, sys_oabi_fstat64)
 		.long	sys_lchown
 		.long	sys_getuid
 /* 200 */	.long	sys_getgid
@@ -235,11 +235,11 @@ __syscall_start:
 		.long	sys_pivot_root
 		.long	sys_mincore
 /* 220 */	.long	sys_madvise
-		.long	sys_fcntl64
+		.long	ABI(sys_fcntl64, sys_oabi_fcntl64)
 		.long	sys_ni_syscall /* TUX */
 		.long	sys_ni_syscall
 		.long	sys_gettid
-/* 225 */	.long	sys_readahead
+/* 225 */	.long	ABI(sys_readahead, sys_oabi_readahead)
 		.long	sys_setxattr
 		.long	sys_lsetxattr
 		.long	sys_fsetxattr
@@ -265,8 +265,8 @@ __syscall_start:
 		.long	sys_exit_group
 		.long	sys_lookup_dcookie
 /* 250 */	.long	sys_epoll_create
-		.long	sys_epoll_ctl
-		.long	sys_epoll_wait
+		.long	ABI(sys_epoll_ctl, sys_oabi_epoll_ctl)
+		.long	ABI(sys_epoll_wait, sys_oabi_epoll_wait)
 	 	.long	sys_remap_file_pages
 		.long	sys_ni_syscall	/* sys_set_thread_area */
 /* 255 */	.long	sys_ni_syscall	/* sys_get_thread_area */
@@ -312,7 +312,7 @@ __syscall_start:
 /* 295 */	.long	sys_getsockopt
 		.long	sys_sendmsg
 		.long	sys_recvmsg
-		.long	sys_semop
+		.long	ABI(sys_semop, sys_oabi_semop)
 		.long	sys_semget
 /* 300 */	.long	sys_semctl
 		.long	sys_msgsnd
@@ -326,7 +326,7 @@ __syscall_start:
 		.long	sys_add_key
 /* 310 */	.long	sys_request_key
 		.long	sys_keyctl
-		.long	sys_semtimedop
+		.long	ABI(sys_semtimedop, sys_oabi_semtimedop)
 /* vserver */	.long	sys_ni_syscall
 		.long	sys_ioprio_set
 /* 315 */	.long	sys_ioprio_get
@@ -336,9 +336,8 @@ __syscall_start:
 		.long	sys_mbind
 /* 320 */	.long	sys_get_mempolicy
 		.long	sys_set_mempolicy
-__syscall_end:
 
-		.rept	NR_syscalls - (__syscall_end - __syscall_start) / 4
+		.rept	NR_syscalls - (. - 100b) / 4
 			.long	sys_ni_syscall
 		.endr
 #endif
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 59ce1bcec42b..8826d9803aeb 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -123,23 +123,49 @@ ENTRY(vector_swi)
 	/*
 	 * Get the system call number.
 	 */
-#if defined(CONFIG_AEABI)
 
-	@ syscall number is in scno (r7) already.
+#if defined(CONFIG_OABI_COMPAT)
 
+	/*
+	 * If we have CONFIG_OABI_COMPAT then we need to look at the swi
+	 * value to determine if it is an EABI or an old ABI call.
+	 */
+#ifdef CONFIG_ARM_THUMB
+	tst	r8, #PSR_T_BIT
+	movne	r10, #0				@ no thumb OABI emulation
+	ldreq	r10, [lr, #-4]			@ get SWI instruction
+#else
+	ldr	r10, [lr, #-4]			@ get SWI instruction
+  A710(	and	ip, r10, #0x0f000000		@ check for SWI		)
+  A710(	teq	ip, #0x0f000000						)
+  A710(	bne	.Larm710bug						)
+#endif
+
+#elif defined(CONFIG_AEABI)
+
+	/*
+	 * Pure EABI user space always put syscall number into scno (r7).
+	 */
   A710(	ldr	ip, [lr, #-4]			@ get SWI instruction	)
   A710(	and	ip, ip, #0x0f000000		@ check for SWI		)
   A710(	teq	ip, #0x0f000000						)
   A710(	bne	.Larm710bug						)
+
 #elif defined(CONFIG_ARM_THUMB)
+
+	/* Legacy ABI only, possibly thumb mode. */
 	tst	r8, #PSR_T_BIT			@ this is SPSR from save_user_regs
 	addne	scno, r7, #__NR_SYSCALL_BASE	@ put OS number in
 	ldreq	scno, [lr, #-4]
+
 #else
+
+	/* Legacy ABI only. */
 	ldr	scno, [lr, #-4]			@ get SWI instruction
   A710(	and	ip, scno, #0x0f000000		@ check for SWI		)
   A710(	teq	ip, #0x0f000000						)
   A710(	bne	.Larm710bug						)
+
 #endif
 
 #ifdef CONFIG_ALIGNMENT_TRAP
@@ -150,12 +176,24 @@ ENTRY(vector_swi)
 	enable_irq
 
 	get_thread_info tsk
+	adr	tbl, sys_call_table		@ load syscall table pointer
 	ldr	ip, [tsk, #TI_FLAGS]		@ check for syscall tracing
-#ifndef CONFIG_AEABI
+
+#if defined(CONFIG_OABI_COMPAT)
+	/*
+	 * If the swi argument is zero, this is an EABI call and we do nothing.
+	 *
+	 * If this is an old ABI call, get the syscall number into scno and
+	 * get the old ABI syscall table address.
+	 */
+	bics	r10, r10, #0xff000000
+	eorne	scno, r10, #__NR_OABI_SYSCALL_BASE
+	ldrne	tbl, =sys_oabi_call_table
+#elif !defined(CONFIG_AEABI)
 	bic	scno, scno, #0xff000000		@ mask off SWI op-code
 	eor	scno, scno, #__NR_SYSCALL_BASE	@ check OS number
 #endif
-	adr	tbl, sys_call_table		@ load syscall table pointer
+
 	stmdb	sp!, {r4, r5}			@ push fifth and sixth args
 	tst	ip, #_TIF_SYSCALL_TRACE		@ are we tracing syscalls?
 	bne	__sys_trace
@@ -199,11 +237,25 @@ __sys_trace_return:
 	.type	__cr_alignment, #object
 __cr_alignment:
 	.word	cr_alignment
+#endif
+	.ltorg
+
+/*
+ * This is the syscall table declaration for native ABI syscalls.
+ * With EABI a couple syscalls are obsolete and defined as sys_ni_syscall.
+ */
+#define ABI(native, compat) native
+#ifdef CONFIG_AEABI
+#define OBSOLETE(syscall) sys_ni_syscall
+#else
+#define OBSOLETE(syscall) syscall
 #endif
 
 	.type	sys_call_table, #object
 ENTRY(sys_call_table)
 #include "calls.S"
+#undef ABI
+#undef OBSOLETE
 
 /*============================================================================
  * Special system call wrappers
@@ -212,8 +264,7 @@ ENTRY(sys_call_table)
 @ r8 = syscall table
 		.type	sys_syscall, #function
 sys_syscall:
-#ifndef CONFIG_AEABI
-		eor	scno, r0, #__NR_SYSCALL_BASE
+		eor	scno, r0, #__NR_OABI_SYSCALL_BASE
 		cmp	scno, #__NR_syscall - __NR_SYSCALL_BASE
 		cmpne	scno, #NR_syscalls	@ check range
 		stmloia	sp, {r5, r6}		@ shuffle args
@@ -222,7 +273,6 @@ sys_syscall:
 		movlo	r2, r3
 		movlo	r3, r4
 		ldrlo	pc, [tbl, scno, lsl #2]
-#endif
 		b	sys_ni_syscall
 
 sys_fork_wrapper:
@@ -290,6 +340,7 @@ sys_mmap2:
 #endif
 
 #ifdef CONFIG_OABI_COMPAT
+
 /*
  * These are syscalls with argument register differences
  */
@@ -318,5 +369,18 @@ sys_oabi_readahead:
 		mov	r2, r1
 		b	sys_readahead
 
+/*
+ * Let's declare a second syscall table for old ABI binaries
+ * using the compatibility syscall entries.
+ */
+#define ABI(native, compat) compat
+#define OBSOLETE(syscall) syscall
+
+	.type	sys_oabi_call_table, #object
+ENTRY(sys_oabi_call_table)
+#include "calls.S"
+#undef ABI
+#undef OBSOLETE
+
 #endif
 
diff --git a/arch/arm/kernel/sys_arm.c b/arch/arm/kernel/sys_arm.c
index ea569ba482b1..a491de2d9024 100644
--- a/arch/arm/kernel/sys_arm.c
+++ b/arch/arm/kernel/sys_arm.c
@@ -147,6 +147,7 @@ asmlinkage int old_select(struct sel_arg_struct __user *arg)
 	return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
 }
 
+#if !defined(CONFIG_AEABI) || defined(CONFIG_OABI_COMPAT)
 /*
  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
  *
@@ -226,6 +227,7 @@ asmlinkage int sys_ipc(uint call, int first, int second, int third,
 		return -ENOSYS;
 	}
 }
+#endif
 
 /* Fork a new task - this creates a new program thread.
  * This is called indirectly via a small wrapper
-- 
cgit v1.2.2


From 3f471126ee53feb5e9b210ea2f525ed3bb9b7a7f Mon Sep 17 00:00:00 2001
From: Nicolas Pitre <nico@cam.org>
Date: Sat, 14 Jan 2006 19:30:04 +0000
Subject: [ARM] 3262/4: allow ptraced syscalls to be overriden

Patch from Nicolas Pitre

This is needed by strace to properly handle the tracing of some system
calls. It could be useful for other applications as well.

Based on an earlier patch from Daniel Jacobowitz.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Daniel Jacobowitz <dan@debian.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 arch/arm/kernel/entry-common.S |  3 +++
 arch/arm/kernel/ptrace.c       | 15 ++++++++++++---
 2 files changed, 15 insertions(+), 3 deletions(-)

(limited to 'arch/arm/kernel')

diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 8826d9803aeb..2b92ce85f97f 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -214,11 +214,13 @@ ENTRY(vector_swi)
 	 * context switches, and waiting for our parent to respond.
 	 */
 __sys_trace:
+	mov	r2, scno
 	add	r1, sp, #S_OFF
 	mov	r0, #0				@ trace entry [IP = 0]
 	bl	syscall_trace
 
 	adr	lr, __sys_trace_return		@ return address
+	mov	scno, r0			@ syscall number (possibly new)
 	add	r1, sp, #S_R0 + S_OFF		@ pointer to regs
 	cmp	scno, #NR_syscalls		@ check upper syscall limit
 	ldmccia	r1, {r0 - r3}			@ have to reload r0 - r3
@@ -227,6 +229,7 @@ __sys_trace:
 
 __sys_trace_return:
 	str	r0, [sp, #S_R0 + S_OFF]!	@ save returned r0
+	mov	r2, scno
 	mov	r1, sp
 	mov	r0, #1				@ trace exit [IP = 1]
 	bl	syscall_trace
diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
index e591f72bcdeb..7b6256bb590e 100644
--- a/arch/arm/kernel/ptrace.c
+++ b/arch/arm/kernel/ptrace.c
@@ -766,6 +766,11 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 				       (unsigned long __user *) data);
 			break;
 
+		case PTRACE_SET_SYSCALL:
+			ret = 0;
+			child->ptrace_message = data;
+			break;
+
 		default:
 			ret = ptrace_request(child, request, addr, data);
 			break;
@@ -774,14 +779,14 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 	return ret;
 }
 
-asmlinkage void syscall_trace(int why, struct pt_regs *regs)
+asmlinkage int syscall_trace(int why, struct pt_regs *regs, int scno)
 {
 	unsigned long ip;
 
 	if (!test_thread_flag(TIF_SYSCALL_TRACE))
-		return;
+		return scno;
 	if (!(current->ptrace & PT_PTRACED))
-		return;
+		return scno;
 
 	/*
 	 * Save IP.  IP is used to denote syscall entry/exit:
@@ -790,6 +795,8 @@ asmlinkage void syscall_trace(int why, struct pt_regs *regs)
 	ip = regs->ARM_ip;
 	regs->ARM_ip = why;
 
+	current->ptrace_message = scno;
+
 	/* the 0x80 provides a way for the tracing parent to distinguish
 	   between a syscall stop and SIGTRAP delivery */
 	ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
@@ -804,4 +811,6 @@ asmlinkage void syscall_trace(int why, struct pt_regs *regs)
 		current->exit_code = 0;
 	}
 	regs->ARM_ip = ip;
+
+	return current->ptrace_message;
 }
-- 
cgit v1.2.2