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Diffstat (limited to 'arch/ia64/kernel/entry.S')
-rw-r--r--arch/ia64/kernel/entry.S53
1 files changed, 29 insertions, 24 deletions
diff --git a/arch/ia64/kernel/entry.S b/arch/ia64/kernel/entry.S
index 1ccbe12a4d84..e25b784a2b72 100644
--- a/arch/ia64/kernel/entry.S
+++ b/arch/ia64/kernel/entry.S
@@ -61,14 +61,13 @@ ENTRY(ia64_execve)
* Allocate 8 input registers since ptrace() may clobber them
*/
.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
- alloc loc1=ar.pfs,8,2,4,0
+ alloc loc1=ar.pfs,8,2,3,0
mov loc0=rp
.body
mov out0=in0 // filename
;; // stop bit between alloc and call
mov out1=in1 // argv
mov out2=in2 // envp
- add out3=16,sp // regs
br.call.sptk.many rp=sys_execve
.ret0:
cmp4.ge p6,p7=r8,r0
@@ -76,7 +75,6 @@ ENTRY(ia64_execve)
sxt4 r8=r8 // return 64-bit result
;;
stf.spill [sp]=f0
-(p6) cmp.ne pKStk,pUStk=r0,r0 // a successful execve() lands us in user-mode...
mov rp=loc0
(p6) mov ar.pfs=r0 // clear ar.pfs on success
(p7) br.ret.sptk.many rp
@@ -118,13 +116,12 @@ GLOBAL_ENTRY(sys_clone2)
mov loc1=r16 // save ar.pfs across do_fork
.body
mov out1=in1
- mov out3=in2
+ mov out2=in2
tbit.nz p6,p0=in0,CLONE_SETTLS_BIT
- mov out4=in3 // parent_tidptr: valid only w/CLONE_PARENT_SETTID
+ mov out3=in3 // parent_tidptr: valid only w/CLONE_PARENT_SETTID
;;
(p6) st8 [r2]=in5 // store TLS in r16 for copy_thread()
- mov out5=in4 // child_tidptr: valid only w/CLONE_CHILD_SETTID or CLONE_CHILD_CLEARTID
- adds out2=IA64_SWITCH_STACK_SIZE+16,sp // out2 = &regs
+ mov out4=in4 // child_tidptr: valid only w/CLONE_CHILD_SETTID or CLONE_CHILD_CLEARTID
mov out0=in0 // out0 = clone_flags
br.call.sptk.many rp=do_fork
.ret1: .restore sp
@@ -150,13 +147,12 @@ GLOBAL_ENTRY(sys_clone)
mov loc1=r16 // save ar.pfs across do_fork
.body
mov out1=in1
- mov out3=16 // stacksize (compensates for 16-byte scratch area)
+ mov out2=16 // stacksize (compensates for 16-byte scratch area)
tbit.nz p6,p0=in0,CLONE_SETTLS_BIT
- mov out4=in2 // parent_tidptr: valid only w/CLONE_PARENT_SETTID
+ mov out3=in2 // parent_tidptr: valid only w/CLONE_PARENT_SETTID
;;
(p6) st8 [r2]=in4 // store TLS in r13 (tp)
- mov out5=in3 // child_tidptr: valid only w/CLONE_CHILD_SETTID or CLONE_CHILD_CLEARTID
- adds out2=IA64_SWITCH_STACK_SIZE+16,sp // out2 = &regs
+ mov out4=in3 // child_tidptr: valid only w/CLONE_CHILD_SETTID or CLONE_CHILD_CLEARTID
mov out0=in0 // out0 = clone_flags
br.call.sptk.many rp=do_fork
.ret2: .restore sp
@@ -484,19 +480,6 @@ GLOBAL_ENTRY(prefetch_stack)
br.ret.sptk.many rp
END(prefetch_stack)
-GLOBAL_ENTRY(kernel_execve)
- rum psr.ac
- mov r15=__NR_execve // put syscall number in place
- break __BREAK_SYSCALL
- br.ret.sptk.many rp
-END(kernel_execve)
-
-GLOBAL_ENTRY(clone)
- mov r15=__NR_clone // put syscall number in place
- break __BREAK_SYSCALL
- br.ret.sptk.many rp
-END(clone)
-
/*
* Invoke a system call, but do some tracing before and after the call.
* We MUST preserve the current register frame throughout this routine
@@ -600,6 +583,27 @@ GLOBAL_ENTRY(ia64_strace_leave_kernel)
.ret4: br.cond.sptk ia64_leave_kernel
END(ia64_strace_leave_kernel)
+ENTRY(call_payload)
+ .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(0)
+ /* call the kernel_thread payload; fn is in r4, arg - in r5 */
+ alloc loc1=ar.pfs,0,3,1,0
+ mov loc0=rp
+ mov loc2=gp
+ mov out0=r5 // arg
+ ld8 r14 = [r4], 8 // fn.address
+ ;;
+ mov b6 = r14
+ ld8 gp = [r4] // fn.gp
+ ;;
+ br.call.sptk.many rp=b6 // fn(arg)
+.ret12: mov gp=loc2
+ mov rp=loc0
+ mov ar.pfs=loc1
+ /* ... and if it has returned, we are going to userland */
+ cmp.ne pKStk,pUStk=r0,r0
+ br.ret.sptk.many rp
+END(call_payload)
+
GLOBAL_ENTRY(ia64_ret_from_clone)
PT_REGS_UNWIND_INFO(0)
{ /*
@@ -616,6 +620,7 @@ GLOBAL_ENTRY(ia64_ret_from_clone)
br.call.sptk.many rp=ia64_invoke_schedule_tail
}
.ret8:
+(pKStk) br.call.sptk.many rp=call_payload
adds r2=TI_FLAGS+IA64_TASK_SIZE,r13
;;
ld4 r2=[r2]