1 files changed, 131 insertions, 15 deletions

diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index e2b42997ad33..2b92ce85f97f 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 +123,50 @@ ENTRY(vector_swi)
         /*
          * Get the system call number.
          */
+
+#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
-        arm710_bug_check scno, ip
 
 #ifdef CONFIG_ALIGNMENT_TRAP
         ldr     ip, __cr_alignment
@@ -145,18 +175,31 @@ ENTRY(vector_swi)
 #endif
         enable_irq
 
-        stmdb   sp!, {r4, r5}                   @ push fifth and sixth args
-
         get_thread_info tsk
+        adr     tbl, sys_call_table             @ load syscall table pointer
         ldr     ip, [tsk, #TI_FLAGS]            @ check for syscall tracing
+
+#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
-        adr     tbl, sys_call_table             @ load syscall table pointer
+#endif
+
+        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
@@ -171,11 +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
@@ -184,6 +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
@@ -195,10 +241,24 @@ __sys_trace_return:
 __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
@@ -207,7 +267,7 @@ ENTRY(sys_call_table)
 @ r8 = syscall table
                 .type   sys_syscall, #function
 sys_syscall:
-                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
@@ -255,6 +315,16 @@ 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.
@@ -271,3 +341,49 @@ 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
+
+/*
+ * 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
+