diff options
Diffstat (limited to 'arch/alpha/kernel/entry.S')
| -rw-r--r-- | arch/alpha/kernel/entry.S | 957 |
1 files changed, 957 insertions, 0 deletions
diff --git a/arch/alpha/kernel/entry.S b/arch/alpha/kernel/entry.S new file mode 100644 index 0000000..f0927ee --- /dev/null +++ b/arch/alpha/kernel/entry.S @@ -0,0 +1,957 @@ +/* + * arch/alpha/kernel/entry.S + * + * Kernel entry-points. + */ + +#include <linux/config.h> +#include <asm/asm_offsets.h> +#include <asm/thread_info.h> +#include <asm/pal.h> +#include <asm/errno.h> +#include <asm/unistd.h> + + .text + .set noat + +/* Stack offsets. */ +#define SP_OFF 184 +#define SWITCH_STACK_SIZE 320 + +/* + * This defines the normal kernel pt-regs layout. + * + * regs 9-15 preserved by C code + * regs 16-18 saved by PAL-code + * regs 29-30 saved and set up by PAL-code + * JRP - Save regs 16-18 in a special area of the stack, so that + * the palcode-provided values are available to the signal handler. + */ + +#define SAVE_ALL \ + subq $sp, SP_OFF, $sp; \ + stq $0, 0($sp); \ + stq $1, 8($sp); \ + stq $2, 16($sp); \ + stq $3, 24($sp); \ + stq $4, 32($sp); \ + stq $28, 144($sp); \ + lda $2, alpha_mv; \ + stq $5, 40($sp); \ + stq $6, 48($sp); \ + stq $7, 56($sp); \ + stq $8, 64($sp); \ + stq $19, 72($sp); \ + stq $20, 80($sp); \ + stq $21, 88($sp); \ + ldq $2, HAE_CACHE($2); \ + stq $22, 96($sp); \ + stq $23, 104($sp); \ + stq $24, 112($sp); \ + stq $25, 120($sp); \ + stq $26, 128($sp); \ + stq $27, 136($sp); \ + stq $2, 152($sp); \ + stq $16, 160($sp); \ + stq $17, 168($sp); \ + stq $18, 176($sp) + +#define RESTORE_ALL \ + lda $19, alpha_mv; \ + ldq $0, 0($sp); \ + ldq $1, 8($sp); \ + ldq $2, 16($sp); \ + ldq $3, 24($sp); \ + ldq $21, 152($sp); \ + ldq $20, HAE_CACHE($19); \ + ldq $4, 32($sp); \ + ldq $5, 40($sp); \ + ldq $6, 48($sp); \ + ldq $7, 56($sp); \ + subq $20, $21, $20; \ + ldq $8, 64($sp); \ + beq $20, 99f; \ + ldq $20, HAE_REG($19); \ + stq $21, HAE_CACHE($19); \ + stq $21, 0($20); \ + ldq $0, 0($sp); \ + ldq $1, 8($sp); \ +99:; \ + ldq $19, 72($sp); \ + ldq $20, 80($sp); \ + ldq $21, 88($sp); \ + ldq $22, 96($sp); \ + ldq $23, 104($sp); \ + ldq $24, 112($sp); \ + ldq $25, 120($sp); \ + ldq $26, 128($sp); \ + ldq $27, 136($sp); \ + ldq $28, 144($sp); \ + addq $sp, SP_OFF, $sp + +/* + * Non-syscall kernel entry points. + */ + + .align 4 + .globl entInt + .ent entInt +entInt: + SAVE_ALL + lda $8, 0x3fff + lda $26, ret_from_sys_call + bic $sp, $8, $8 + mov $sp, $19 + jsr $31, do_entInt +.end entInt + + .align 4 + .globl entArith + .ent entArith +entArith: + SAVE_ALL + lda $8, 0x3fff + lda $26, ret_from_sys_call + bic $sp, $8, $8 + mov $sp, $18 + jsr $31, do_entArith +.end entArith + + .align 4 + .globl entMM + .ent entMM +entMM: + SAVE_ALL +/* save $9 - $15 so the inline exception code can manipulate them. */ + subq $sp, 56, $sp + stq $9, 0($sp) + stq $10, 8($sp) + stq $11, 16($sp) + stq $12, 24($sp) + stq $13, 32($sp) + stq $14, 40($sp) + stq $15, 48($sp) + addq $sp, 56, $19 +/* handle the fault */ + lda $8, 0x3fff + bic $sp, $8, $8 + jsr $26, do_page_fault +/* reload the registers after the exception code played. */ + ldq $9, 0($sp) + ldq $10, 8($sp) + ldq $11, 16($sp) + ldq $12, 24($sp) + ldq $13, 32($sp) + ldq $14, 40($sp) + ldq $15, 48($sp) + addq $sp, 56, $sp +/* finish up the syscall as normal. */ + br ret_from_sys_call +.end entMM + + .align 4 + .globl entIF + .ent entIF +entIF: + SAVE_ALL + lda $8, 0x3fff + lda $26, ret_from_sys_call + bic $sp, $8, $8 + mov $sp, $17 + jsr $31, do_entIF +.end entIF + + .align 4 + .globl entUna + .ent entUna +entUna: + lda $sp, -256($sp) + stq $0, 0($sp) + ldq $0, 256($sp) /* get PS */ + stq $1, 8($sp) + stq $2, 16($sp) + stq $3, 24($sp) + and $0, 8, $0 /* user mode? */ + stq $4, 32($sp) + bne $0, entUnaUser /* yup -> do user-level unaligned fault */ + stq $5, 40($sp) + stq $6, 48($sp) + stq $7, 56($sp) + stq $8, 64($sp) + stq $9, 72($sp) + stq $10, 80($sp) + stq $11, 88($sp) + stq $12, 96($sp) + stq $13, 104($sp) + stq $14, 112($sp) + stq $15, 120($sp) + /* 16-18 PAL-saved */ + stq $19, 152($sp) + stq $20, 160($sp) + stq $21, 168($sp) + stq $22, 176($sp) + stq $23, 184($sp) + stq $24, 192($sp) + stq $25, 200($sp) + stq $26, 208($sp) + stq $27, 216($sp) + stq $28, 224($sp) + stq $gp, 232($sp) + lda $8, 0x3fff + stq $31, 248($sp) + bic $sp, $8, $8 + jsr $26, do_entUna + ldq $0, 0($sp) + ldq $1, 8($sp) + ldq $2, 16($sp) + ldq $3, 24($sp) + ldq $4, 32($sp) + ldq $5, 40($sp) + ldq $6, 48($sp) + ldq $7, 56($sp) + ldq $8, 64($sp) + ldq $9, 72($sp) + ldq $10, 80($sp) + ldq $11, 88($sp) + ldq $12, 96($sp) + ldq $13, 104($sp) + ldq $14, 112($sp) + ldq $15, 120($sp) + /* 16-18 PAL-saved */ + ldq $19, 152($sp) + ldq $20, 160($sp) + ldq $21, 168($sp) + ldq $22, 176($sp) + ldq $23, 184($sp) + ldq $24, 192($sp) + ldq $25, 200($sp) + ldq $26, 208($sp) + ldq $27, 216($sp) + ldq $28, 224($sp) + ldq $gp, 232($sp) + lda $sp, 256($sp) + call_pal PAL_rti +.end entUna + + .align 4 + .ent entUnaUser +entUnaUser: + ldq $0, 0($sp) /* restore original $0 */ + lda $sp, 256($sp) /* pop entUna's stack frame */ + SAVE_ALL /* setup normal kernel stack */ + lda $sp, -56($sp) + stq $9, 0($sp) + stq $10, 8($sp) + stq $11, 16($sp) + stq $12, 24($sp) + stq $13, 32($sp) + stq $14, 40($sp) + stq $15, 48($sp) + lda $8, 0x3fff + addq $sp, 56, $19 + bic $sp, $8, $8 + jsr $26, do_entUnaUser + ldq $9, 0($sp) + ldq $10, 8($sp) + ldq $11, 16($sp) + ldq $12, 24($sp) + ldq $13, 32($sp) + ldq $14, 40($sp) + ldq $15, 48($sp) + lda $sp, 56($sp) + br ret_from_sys_call +.end entUnaUser + + .align 4 + .globl entDbg + .ent entDbg +entDbg: + SAVE_ALL + lda $8, 0x3fff + lda $26, ret_from_sys_call + bic $sp, $8, $8 + mov $sp, $16 + jsr $31, do_entDbg +.end entDbg + +/* + * The system call entry point is special. Most importantly, it looks + * like a function call to userspace as far as clobbered registers. We + * do preserve the argument registers (for syscall restarts) and $26 + * (for leaf syscall functions). + * + * So much for theory. We don't take advantage of this yet. + * + * Note that a0-a2 are not saved by PALcode as with the other entry points. + */ + + .align 4 + .globl entSys + .globl ret_from_sys_call + .ent entSys +entSys: + SAVE_ALL + lda $8, 0x3fff + bic $sp, $8, $8 + lda $4, NR_SYSCALLS($31) + stq $16, SP_OFF+24($sp) + lda $5, sys_call_table + lda $27, sys_ni_syscall + cmpult $0, $4, $4 + ldl $3, TI_FLAGS($8) + stq $17, SP_OFF+32($sp) + s8addq $0, $5, $5 + stq $18, SP_OFF+40($sp) + blbs $3, strace + beq $4, 1f + ldq $27, 0($5) +1: jsr $26, ($27), alpha_ni_syscall + ldgp $gp, 0($26) + blt $0, $syscall_error /* the call failed */ + stq $0, 0($sp) + stq $31, 72($sp) /* a3=0 => no error */ + + .align 4 +ret_from_sys_call: + cmovne $26, 0, $19 /* $19 = 0 => non-restartable */ + ldq $0, SP_OFF($sp) + and $0, 8, $0 + beq $0, restore_all +ret_from_reschedule: + /* Make sure need_resched and sigpending don't change between + sampling and the rti. */ + lda $16, 7 + call_pal PAL_swpipl + ldl $5, TI_FLAGS($8) + and $5, _TIF_WORK_MASK, $2 + bne $5, work_pending +restore_all: + RESTORE_ALL + call_pal PAL_rti + + .align 3 +$syscall_error: + /* + * Some system calls (e.g., ptrace) can return arbitrary + * values which might normally be mistaken as error numbers. + * Those functions must zero $0 (v0) directly in the stack + * frame to indicate that a negative return value wasn't an + * error number.. + */ + ldq $19, 0($sp) /* old syscall nr (zero if success) */ + beq $19, $ret_success + + ldq $20, 72($sp) /* .. and this a3 */ + subq $31, $0, $0 /* with error in v0 */ + addq $31, 1, $1 /* set a3 for errno return */ + stq $0, 0($sp) + mov $31, $26 /* tell "ret_from_sys_call" we can restart */ + stq $1, 72($sp) /* a3 for return */ + br ret_from_sys_call + +$ret_success: + stq $0, 0($sp) + stq $31, 72($sp) /* a3=0 => no error */ + br ret_from_sys_call +.end entSys + +/* + * Do all cleanup when returning from all interrupts and system calls. + * + * Arguments: + * $5: TI_FLAGS. + * $8: current. + * $19: The old syscall number, or zero if this is not a return + * from a syscall that errored and is possibly restartable. + * $20: Error indication. + */ + + .align 4 + .ent work_pending +work_pending: + and $5, _TIF_NEED_RESCHED, $2 + beq $2, $work_notifysig + +$work_resched: + subq $sp, 16, $sp + stq $19, 0($sp) /* save syscall nr */ + stq $20, 8($sp) /* and error indication (a3) */ + jsr $26, schedule + ldq $19, 0($sp) + ldq $20, 8($sp) + addq $sp, 16, $sp + /* Make sure need_resched and sigpending don't change between + sampling and the rti. */ + lda $16, 7 + call_pal PAL_swpipl + ldl $5, TI_FLAGS($8) + and $5, _TIF_WORK_MASK, $2 + beq $2, restore_all + and $5, _TIF_NEED_RESCHED, $2 + bne $2, $work_resched + +$work_notifysig: + mov $sp, $17 + br $1, do_switch_stack + mov $5, $21 + mov $sp, $18 + mov $31, $16 + jsr $26, do_notify_resume + bsr $1, undo_switch_stack + br restore_all +.end work_pending + +/* + * PTRACE syscall handler + */ + + .align 4 + .ent strace +strace: + /* set up signal stack, call syscall_trace */ + bsr $1, do_switch_stack + jsr $26, syscall_trace + bsr $1, undo_switch_stack + + /* get the system call number and the arguments back.. */ + ldq $0, 0($sp) + ldq $16, SP_OFF+24($sp) + ldq $17, SP_OFF+32($sp) + ldq $18, SP_OFF+40($sp) + ldq $19, 72($sp) + ldq $20, 80($sp) + ldq $21, 88($sp) + + /* get the system call pointer.. */ + lda $1, NR_SYSCALLS($31) + lda $2, sys_call_table + lda $27, alpha_ni_syscall + cmpult $0, $1, $1 + s8addq $0, $2, $2 + beq $1, 1f + ldq $27, 0($2) +1: jsr $26, ($27), sys_gettimeofday + ldgp $gp, 0($26) + + /* check return.. */ + blt $0, $strace_error /* the call failed */ + stq $31, 72($sp) /* a3=0 => no error */ +$strace_success: + stq $0, 0($sp) /* save return value */ + + bsr $1, do_switch_stack + jsr $26, syscall_trace + bsr $1, undo_switch_stack + br $31, ret_from_sys_call + + .align 3 +$strace_error: + ldq $19, 0($sp) /* old syscall nr (zero if success) */ + beq $19, $strace_success + ldq $20, 72($sp) /* .. and this a3 */ + + subq $31, $0, $0 /* with error in v0 */ + addq $31, 1, $1 /* set a3 for errno return */ + stq $0, 0($sp) + stq $1, 72($sp) /* a3 for return */ + + bsr $1, do_switch_stack + mov $19, $9 /* save old syscall number */ + mov $20, $10 /* save old a3 */ + jsr $26, syscall_trace + mov $9, $19 + mov $10, $20 + bsr $1, undo_switch_stack + + mov $31, $26 /* tell "ret_from_sys_call" we can restart */ + br ret_from_sys_call +.end strace + +/* + * Save and restore the switch stack -- aka the balance of the user context. + */ + + .align 4 + .ent do_switch_stack +do_switch_stack: + lda $sp, -SWITCH_STACK_SIZE($sp) + stq $9, 0($sp) + stq $10, 8($sp) + stq $11, 16($sp) + stq $12, 24($sp) + stq $13, 32($sp) + stq $14, 40($sp) + stq $15, 48($sp) + stq $26, 56($sp) + stt $f0, 64($sp) + stt $f1, 72($sp) + stt $f2, 80($sp) + stt $f3, 88($sp) + stt $f4, 96($sp) + stt $f5, 104($sp) + stt $f6, 112($sp) + stt $f7, 120($sp) + stt $f8, 128($sp) + stt $f9, 136($sp) + stt $f10, 144($sp) + stt $f11, 152($sp) + stt $f12, 160($sp) + stt $f13, 168($sp) + stt $f14, 176($sp) + stt $f15, 184($sp) + stt $f16, 192($sp) + stt $f17, 200($sp) + stt $f18, 208($sp) + stt $f19, 216($sp) + stt $f20, 224($sp) + stt $f21, 232($sp) + stt $f22, 240($sp) + stt $f23, 248($sp) + stt $f24, 256($sp) + stt $f25, 264($sp) + stt $f26, 272($sp) + stt $f27, 280($sp) + mf_fpcr $f0 # get fpcr + stt $f28, 288($sp) + stt $f29, 296($sp) + stt $f30, 304($sp) + stt $f0, 312($sp) # save fpcr in slot of $f31 + ldt $f0, 64($sp) # dont let "do_switch_stack" change fp state. + ret $31, ($1), 1 +.end do_switch_stack + + .align 4 + .ent undo_switch_stack +undo_switch_stack: + ldq $9, 0($sp) + ldq $10, 8($sp) + ldq $11, 16($sp) + ldq $12, 24($sp) + ldq $13, 32($sp) + ldq $14, 40($sp) + ldq $15, 48($sp) + ldq $26, 56($sp) + ldt $f30, 312($sp) # get saved fpcr + ldt $f0, 64($sp) + ldt $f1, 72($sp) + ldt $f2, 80($sp) + ldt $f3, 88($sp) + mt_fpcr $f30 # install saved fpcr + ldt $f4, 96($sp) + ldt $f5, 104($sp) + ldt $f6, 112($sp) + ldt $f7, 120($sp) + ldt $f8, 128($sp) + ldt $f9, 136($sp) + ldt $f10, 144($sp) + ldt $f11, 152($sp) + ldt $f12, 160($sp) + ldt $f13, 168($sp) + ldt $f14, 176($sp) + ldt $f15, 184($sp) + ldt $f16, 192($sp) + ldt $f17, 200($sp) + ldt $f18, 208($sp) + ldt $f19, 216($sp) + ldt $f20, 224($sp) + ldt $f21, 232($sp) + ldt $f22, 240($sp) + ldt $f23, 248($sp) + ldt $f24, 256($sp) + ldt $f25, 264($sp) + ldt $f26, 272($sp) + ldt $f27, 280($sp) + ldt $f28, 288($sp) + ldt $f29, 296($sp) + ldt $f30, 304($sp) + lda $sp, SWITCH_STACK_SIZE($sp) + ret $31, ($1), 1 +.end undo_switch_stack + +/* + * The meat of the context switch code. + */ + + .align 4 + .globl alpha_switch_to + .ent alpha_switch_to +alpha_switch_to: + .prologue 0 + bsr $1, do_switch_stack + call_pal PAL_swpctx + lda $8, 0x3fff + bsr $1, undo_switch_stack + bic $sp, $8, $8 + mov $17, $0 + ret +.end alpha_switch_to + +/* + * New processes begin life here. + */ + + .globl ret_from_fork + .align 4 + .ent ret_from_fork +ret_from_fork: + lda $26, ret_from_sys_call + mov $17, $16 + jmp $31, schedule_tail +.end ret_from_fork + +/* + * kernel_thread(fn, arg, clone_flags) + */ + .align 4 + .globl kernel_thread + .ent kernel_thread +kernel_thread: + /* We can be called from a module. */ + ldgp $gp, 0($27) + .prologue 1 + subq $sp, SP_OFF+6*8, $sp + br $1, 2f /* load start address */ + + /* We've now "returned" from a fake system call. */ + unop + blt $0, 1f /* error? */ + ldi $1, 0x3fff + beq $20, 1f /* parent or child? */ + + bic $sp, $1, $8 /* in child. */ + jsr $26, ($27) + ldgp $gp, 0($26) + mov $0, $16 + mov $31, $26 + jmp $31, sys_exit + +1: ret /* in parent. */ + + .align 4 +2: /* Fake a system call stack frame, as we can't do system calls + from kernel space. Note that we store FN and ARG as they + need to be set up in the child for the call. Also store $8 + and $26 for use in the parent. */ + stq $31, SP_OFF($sp) /* ps */ + stq $1, SP_OFF+8($sp) /* pc */ + stq $gp, SP_OFF+16($sp) /* gp */ + stq $16, 136($sp) /* $27; FN for child */ + stq $17, SP_OFF+24($sp) /* $16; ARG for child */ + stq $8, 64($sp) /* $8 */ + stq $26, 128($sp) /* $26 */ + /* Avoid the HAE being gratuitously wrong, to avoid restoring it. */ + ldq $2, alpha_mv+HAE_CACHE + stq $2, 152($sp) /* HAE */ + + /* Shuffle FLAGS to the front; add CLONE_VM. */ + ldi $1, CLONE_VM|CLONE_UNTRACED + or $18, $1, $16 + bsr $26, sys_clone + + /* We don't actually care for a3 success widgetry in the kernel. + Not for positive errno values. */ + stq $0, 0($sp) /* $0 */ + br restore_all +.end kernel_thread + +/* + * execve(path, argv, envp) + */ + .align 4 + .globl execve + .ent execve +execve: + /* We can be called from a module. */ + ldgp $gp, 0($27) + lda $sp, -(32+SIZEOF_PT_REGS+8)($sp) + .frame $sp, 32+SIZEOF_PT_REGS+8, $26, 0 + stq $26, 0($sp) + stq $16, 8($sp) + stq $17, 16($sp) + stq $18, 24($sp) + .prologue 1 + + lda $16, 32($sp) + lda $17, 0 + lda $18, SIZEOF_PT_REGS + bsr $26, memset !samegp + + /* Avoid the HAE being gratuitously wrong, which would cause us + to do the whole turn off interrupts thing and restore it. */ + ldq $2, alpha_mv+HAE_CACHE + stq $2, 152+32($sp) + + ldq $16, 8($sp) + ldq $17, 16($sp) + ldq $18, 24($sp) + lda $19, 32($sp) + bsr $26, do_execve !samegp + + ldq $26, 0($sp) + bne $0, 1f /* error! */ + + /* Move the temporary pt_regs struct from its current location + to the top of the kernel stack frame. See copy_thread for + details for a normal process. */ + lda $16, 0x4000 - SIZEOF_PT_REGS($8) + lda $17, 32($sp) + lda $18, SIZEOF_PT_REGS + bsr $26, memmove !samegp + + /* Take that over as our new stack frame and visit userland! */ + lda $sp, 0x4000 - SIZEOF_PT_REGS($8) + br $31, ret_from_sys_call + +1: lda $sp, 32+SIZEOF_PT_REGS+8($sp) + ret +.end execve + + +/* + * Special system calls. Most of these are special in that they either + * have to play switch_stack games or in some way use the pt_regs struct. + */ + .align 4 + .globl sys_fork + .ent sys_fork +sys_fork: + .prologue 0 + mov $sp, $21 + bsr $1, do_switch_stack + bis $31, SIGCHLD, $16 + mov $31, $17 + mov $31, $18 + mov $31, $19 + mov $31, $20 + jsr $26, alpha_clone + bsr $1, undo_switch_stack + ret +.end sys_fork + + .align 4 + .globl sys_clone + .ent sys_clone +sys_clone: + .prologue 0 + mov $sp, $21 + bsr $1, do_switch_stack + /* $16, $17, $18, $19, $20 come from the user. */ + jsr $26, alpha_clone + bsr $1, undo_switch_stack + ret +.end sys_clone + + .align 4 + .globl sys_vfork + .ent sys_vfork +sys_vfork: + .prologue 0 + mov $sp, $16 + bsr $1, do_switch_stack + jsr $26, alpha_vfork + bsr $1, undo_switch_stack + ret +.end sys_vfork + + .align 4 + .globl sys_sigreturn + .ent sys_sigreturn +sys_sigreturn: + .prologue 0 + mov $sp, $17 + lda $18, -SWITCH_STACK_SIZE($sp) + lda $sp, -SWITCH_STACK_SIZE($sp) + jsr $26, do_sigreturn + br $1, undo_switch_stack + br ret_from_sys_call +.end sys_sigreturn + + .align 4 + .globl sys_rt_sigreturn + .ent sys_rt_sigreturn +sys_rt_sigreturn: + .prologue 0 + mov $sp, $17 + lda $18, -SWITCH_STACK_SIZE($sp) + lda $sp, -SWITCH_STACK_SIZE($sp) + jsr $26, do_rt_sigreturn + br $1, undo_switch_stack + br ret_from_sys_call +.end sys_rt_sigreturn + + .align 4 + .globl sys_sigsuspend + .ent sys_sigsuspend +sys_sigsuspend: + .prologue 0 + mov $sp, $17 + br $1, do_switch_stack + mov $sp, $18 + subq $sp, 16, $sp + stq $26, 0($sp) + jsr $26, do_sigsuspend + ldq $26, 0($sp) + lda $sp, SWITCH_STACK_SIZE+16($sp) + ret +.end sys_sigsuspend + + .align 4 + .globl sys_rt_sigsuspend + .ent sys_rt_sigsuspend +sys_rt_sigsuspend: + .prologue 0 + mov $sp, $18 + br $1, do_switch_stack + mov $sp, $19 + subq $sp, 16, $sp + stq $26, 0($sp) + jsr $26, do_rt_sigsuspend + ldq $26, 0($sp) + lda $sp, SWITCH_STACK_SIZE+16($sp) + ret +.end sys_rt_sigsuspend + + .align 4 + .globl sys_sethae + .ent sys_sethae +sys_sethae: + .prologue 0 + stq $16, 152($sp) + ret +.end sys_sethae + + .align 4 + .globl osf_getpriority + .ent osf_getpriority +osf_getpriority: + lda $sp, -16($sp) + stq $26, 0($sp) + .prologue 0 + + jsr $26, sys_getpriority + + ldq $26, 0($sp) + blt $0, 1f + + /* Return value is the unbiased priority, i.e. 20 - prio. + This does result in negative return values, so signal + no error by writing into the R0 slot. */ + lda $1, 20 + stq $31, 16($sp) + subl $1, $0, $0 + unop + +1: lda $sp, 16($sp) + ret +.end osf_getpriority + + .align 4 + .globl sys_getxuid + .ent sys_getxuid +sys_getxuid: + .prologue 0 + ldq $2, TI_TASK($8) + ldl $0, TASK_UID($2) + ldl $1, TASK_EUID($2) + stq $1, 80($sp) + ret +.end sys_getxuid + + .align 4 + .globl sys_getxgid + .ent sys_getxgid +sys_getxgid: + .prologue 0 + ldq $2, TI_TASK($8) + ldl $0, TASK_GID($2) + ldl $1, TASK_EGID($2) + stq $1, 80($sp) + ret +.end sys_getxgid + + .align 4 + .globl sys_getxpid + .ent sys_getxpid +sys_getxpid: + .prologue 0 + ldq $2, TI_TASK($8) + + /* See linux/kernel/timer.c sys_getppid for discussion + about this loop. */ + ldq $3, TASK_REAL_PARENT($2) +1: ldl $1, TASK_TGID($3) +#ifdef CONFIG_SMP + mov $3, $4 + mb + ldq $3, TASK_REAL_PARENT($2) + cmpeq $3, $4, $4 + beq $4, 1b +#endif + stq $1, 80($sp) + ldl $0, TASK_TGID($2) + ret +.end sys_getxpid + + .align 4 + .globl sys_pipe + .ent sys_pipe +sys_pipe: + lda $sp, -16($sp) + stq $26, 0($sp) + .prologue 0 + + lda $16, 8($sp) + jsr $26, do_pipe + + ldq $26, 0($sp) + bne $0, 1f + + /* The return values are in $0 and $20. */ + ldl $1, 12($sp) + ldl $0, 8($sp) + + stq $1, 80+16($sp) +1: lda $sp, 16($sp) + ret +.end sys_pipe + + .align 4 + .globl sys_ptrace + .ent sys_ptrace +sys_ptrace: + .prologue 0 + mov $sp, $20 + jmp $31, do_sys_ptrace +.end sys_ptrace + + .align 4 + .globl sys_execve + .ent sys_execve +sys_execve: + .prologue 0 + mov $sp, $19 + jmp $31, do_sys_execve +.end sys_execve + + .align 4 + .globl osf_sigprocmask + .ent osf_sigprocmask +osf_sigprocmask: + .prologue 0 + mov $sp, $18 + jmp $31, do_osf_sigprocmask +.end osf_sigprocmask + + .align 4 + .globl alpha_ni_syscall + .ent alpha_ni_syscall +alpha_ni_syscall: + .prologue 0 + /* Special because it also implements overflow handling via + syscall number 0. And if you recall, zero is a special + trigger for "not an error". Store large non-zero there. */ + lda $0, -ENOSYS + unop + stq $0, 0($sp) + ret +.end alpha_ni_syscall |
