alpha: take a bunch of syscalls into osf_sys.c
New helper: current_thread_info(). Allows to do a bunch of odd syscalls in C. While we are at it, there had never been a reason to do osf_getpriority() in assembler. We also get "namespace"-aware (read: consistent with getuid(2), etc.) behaviour from getx?id() syscalls now. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Michael Cree <mcree@orcon.net.nz> Acked-by: Matt Turner <mattst88@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Al Viro
Linus Torvalds
parent
f2db633d30
commit
be53db6e4e
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@ -76,7 +76,10 @@ struct switch_stack {
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#define task_pt_regs(task) \
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((struct pt_regs *) (task_stack_page(task) + 2*PAGE_SIZE) - 1)
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#define force_successful_syscall_return() (task_pt_regs(current)->r0 = 0)
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#define current_pt_regs() \
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((struct pt_regs *) ((char *)current_thread_info() + 2*PAGE_SIZE) - 1)
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#define force_successful_syscall_return() (current_pt_regs()->r0 = 0)
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#endif
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@ -796,115 +796,6 @@ sys_rt_sigreturn:
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br ret_from_sys_call
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.end sys_rt_sigreturn
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.align 4
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.globl sys_sethae
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.ent sys_sethae
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sys_sethae:
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.prologue 0
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stq $16, 152($sp)
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ret
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.end sys_sethae
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.align 4
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.globl osf_getpriority
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.ent osf_getpriority
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osf_getpriority:
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lda $sp, -16($sp)
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stq $26, 0($sp)
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.prologue 0
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jsr $26, sys_getpriority
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ldq $26, 0($sp)
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blt $0, 1f
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/* Return value is the unbiased priority, i.e. 20 - prio.
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This does result in negative return values, so signal
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no error by writing into the R0 slot. */
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lda $1, 20
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stq $31, 16($sp)
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subl $1, $0, $0
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unop
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1: lda $sp, 16($sp)
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ret
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.end osf_getpriority
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.align 4
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.globl sys_getxuid
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.ent sys_getxuid
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sys_getxuid:
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.prologue 0
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ldq $2, TI_TASK($8)
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ldq $3, TASK_CRED($2)
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ldl $0, CRED_UID($3)
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ldl $1, CRED_EUID($3)
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stq $1, 80($sp)
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ret
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.end sys_getxuid
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.align 4
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.globl sys_getxgid
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.ent sys_getxgid
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sys_getxgid:
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.prologue 0
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ldq $2, TI_TASK($8)
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ldq $3, TASK_CRED($2)
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ldl $0, CRED_GID($3)
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ldl $1, CRED_EGID($3)
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stq $1, 80($sp)
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ret
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.end sys_getxgid
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.align 4
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.globl sys_getxpid
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.ent sys_getxpid
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sys_getxpid:
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.prologue 0
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ldq $2, TI_TASK($8)
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/* See linux/kernel/timer.c sys_getppid for discussion
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about this loop. */
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ldq $3, TASK_GROUP_LEADER($2)
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ldq $4, TASK_REAL_PARENT($3)
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ldl $0, TASK_TGID($2)
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1: ldl $1, TASK_TGID($4)
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#ifdef CONFIG_SMP
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mov $4, $5
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mb
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ldq $3, TASK_GROUP_LEADER($2)
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ldq $4, TASK_REAL_PARENT($3)
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cmpeq $4, $5, $5
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beq $5, 1b
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#endif
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stq $1, 80($sp)
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ret
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.end sys_getxpid
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.align 4
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.globl sys_alpha_pipe
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.ent sys_alpha_pipe
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sys_alpha_pipe:
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lda $sp, -16($sp)
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stq $26, 0($sp)
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.prologue 0
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mov $31, $17
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lda $16, 8($sp)
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jsr $26, do_pipe_flags
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ldq $26, 0($sp)
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bne $0, 1f
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/* The return values are in $0 and $20. */
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ldl $1, 12($sp)
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ldl $0, 8($sp)
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stq $1, 80+16($sp)
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1: lda $sp, 16($sp)
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ret
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.end sys_alpha_pipe
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.align 4
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.globl sys_execve
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.ent sys_execve
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@ -1404,3 +1404,52 @@ SYSCALL_DEFINE3(osf_writev, unsigned long, fd,
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}
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#endif
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SYSCALL_DEFINE2(osf_getpriority, int, which, int, who)
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{
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int prio = sys_getpriority(which, who);
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if (prio >= 0) {
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/* Return value is the unbiased priority, i.e. 20 - prio.
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This does result in negative return values, so signal
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no error */
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force_successful_syscall_return();
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prio = 20 - prio;
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}
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return prio;
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}
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SYSCALL_DEFINE0(getxuid)
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{
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current_pt_regs()->r20 = sys_geteuid();
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return sys_getuid();
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}
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SYSCALL_DEFINE0(getxgid)
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{
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current_pt_regs()->r20 = sys_getegid();
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return sys_getgid();
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}
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SYSCALL_DEFINE0(getxpid)
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{
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current_pt_regs()->r20 = sys_getppid();
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return sys_getpid();
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}
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SYSCALL_DEFINE0(alpha_pipe)
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{
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int fd[2];
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int res = do_pipe_flags(fd, 0);
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if (!res) {
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/* The return values are in $0 and $20. */
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current_pt_regs()->r20 = fd[1];
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res = fd[0];
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}
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return res;
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}
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SYSCALL_DEFINE1(sethae, unsigned long, val)
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{
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current_pt_regs()->hae = val;
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return 0;
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}
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@ -111,7 +111,7 @@ sys_call_table:
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.quad sys_socket
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.quad sys_connect
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.quad sys_accept
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.quad osf_getpriority /* 100 */
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.quad sys_osf_getpriority /* 100 */
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.quad sys_send
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.quad sys_recv
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.quad sys_sigreturn
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@ -1407,13 +1407,6 @@ SYSCALL_DEFINE1(alarm, unsigned int, seconds)
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#endif
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#ifndef __alpha__
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/*
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* The Alpha uses getxpid, getxuid, and getxgid instead. Maybe this
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* should be moved into arch/i386 instead?
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*/
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/**
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* sys_getpid - return the thread group id of the current process
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*
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@ -1469,8 +1462,6 @@ SYSCALL_DEFINE0(getegid)
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return from_kgid_munged(current_user_ns(), current_egid());
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}
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#endif
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static void process_timeout(unsigned long __data)
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{
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wake_up_process((struct task_struct *)__data);
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