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-rw-r--r--arch/parisc/kernel/entry.S217
1 files changed, 20 insertions, 197 deletions
diff --git a/arch/parisc/kernel/entry.S b/arch/parisc/kernel/entry.S
index 18670a078849..c9a9abd4bc58 100644
--- a/arch/parisc/kernel/entry.S
+++ b/arch/parisc/kernel/entry.S
@@ -708,59 +708,9 @@ ENTRY(end_fault_vector)
708 .import do_cpu_irq_mask,code 708 .import do_cpu_irq_mask,code
709 709
710 /* 710 /*
711 * r26 = function to be called
712 * r25 = argument to pass in
713 * r24 = flags for do_fork()
714 *
715 * Kernel threads don't ever return, so they don't need
716 * a true register context. We just save away the arguments
717 * for copy_thread/ret_ to properly set up the child.
718 */
719
720#define CLONE_VM 0x100 /* Must agree with <linux/sched.h> */
721#define CLONE_UNTRACED 0x00800000
722
723 .import do_fork
724ENTRY(__kernel_thread)
725 STREG %r2, -RP_OFFSET(%r30)
726
727 copy %r30, %r1
728 ldo PT_SZ_ALGN(%r30),%r30
729#ifdef CONFIG_64BIT
730 /* Yo, function pointers in wide mode are little structs... -PB */
731 ldd 24(%r26), %r2
732 STREG %r2, PT_GR27(%r1) /* Store childs %dp */
733 ldd 16(%r26), %r26
734
735 STREG %r22, PT_GR22(%r1) /* save r22 (arg5) */
736 copy %r0, %r22 /* user_tid */
737#endif
738 STREG %r26, PT_GR26(%r1) /* Store function & argument for child */
739 STREG %r25, PT_GR25(%r1)
740 ldil L%CLONE_UNTRACED, %r26
741 ldo CLONE_VM(%r26), %r26 /* Force CLONE_VM since only init_mm */
742 or %r26, %r24, %r26 /* will have kernel mappings. */
743 ldi 1, %r25 /* stack_start, signals kernel thread */
744 stw %r0, -52(%r30) /* user_tid */
745#ifdef CONFIG_64BIT
746 ldo -16(%r30),%r29 /* Reference param save area */
747#endif
748 BL do_fork, %r2
749 copy %r1, %r24 /* pt_regs */
750
751 /* Parent Returns here */
752
753 LDREG -PT_SZ_ALGN-RP_OFFSET(%r30), %r2
754 ldo -PT_SZ_ALGN(%r30), %r30
755 bv %r0(%r2)
756 nop
757ENDPROC(__kernel_thread)
758
759 /*
760 * Child Returns here 711 * Child Returns here
761 * 712 *
762 * copy_thread moved args from temp save area set up above 713 * copy_thread moved args into task save area.
763 * into task save area.
764 */ 714 */
765 715
766ENTRY(ret_from_kernel_thread) 716ENTRY(ret_from_kernel_thread)
@@ -769,51 +719,17 @@ ENTRY(ret_from_kernel_thread)
769 BL schedule_tail, %r2 719 BL schedule_tail, %r2
770 nop 720 nop
771 721
772 LDREG TI_TASK-THREAD_SZ_ALGN(%r30), %r1 722 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
773 LDREG TASK_PT_GR25(%r1), %r26 723 LDREG TASK_PT_GR25(%r1), %r26
774#ifdef CONFIG_64BIT 724#ifdef CONFIG_64BIT
775 LDREG TASK_PT_GR27(%r1), %r27 725 LDREG TASK_PT_GR27(%r1), %r27
776 LDREG TASK_PT_GR22(%r1), %r22
777#endif 726#endif
778 LDREG TASK_PT_GR26(%r1), %r1 727 LDREG TASK_PT_GR26(%r1), %r1
779 ble 0(%sr7, %r1) 728 ble 0(%sr7, %r1)
780 copy %r31, %r2 729 copy %r31, %r2
781 730 b finish_child_return
782#ifdef CONFIG_64BIT
783 ldo -16(%r30),%r29 /* Reference param save area */
784 loadgp /* Thread could have been in a module */
785#endif
786#ifndef CONFIG_64BIT
787 b sys_exit
788#else
789 load32 sys_exit, %r1
790 bv %r0(%r1)
791#endif
792 ldi 0, %r26
793ENDPROC(ret_from_kernel_thread)
794
795 .import sys_execve, code
796ENTRY(__execve)
797 copy %r2, %r15
798 copy %r30, %r16
799 ldo PT_SZ_ALGN(%r30), %r30
800 STREG %r26, PT_GR26(%r16)
801 STREG %r25, PT_GR25(%r16)
802 STREG %r24, PT_GR24(%r16)
803#ifdef CONFIG_64BIT
804 ldo -16(%r30),%r29 /* Reference param save area */
805#endif
806 BL sys_execve, %r2
807 copy %r16, %r26
808
809 cmpib,=,n 0,%r28,intr_return /* forward */
810
811 /* yes, this will trap and die. */
812 copy %r15, %r2
813 copy %r16, %r30
814 bv %r0(%r2)
815 nop 731 nop
816ENDPROC(__execve) 732ENDPROC(ret_from_kernel_thread)
817 733
818 734
819 /* 735 /*
@@ -1776,49 +1692,27 @@ ENTRY(sys_fork_wrapper)
1776 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1 1692 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
1777 ldo TASK_REGS(%r1),%r1 1693 ldo TASK_REGS(%r1),%r1
1778 reg_save %r1 1694 reg_save %r1
1779 mfctl %cr27, %r3 1695 mfctl %cr27, %r28
1780 STREG %r3, PT_CR27(%r1) 1696 STREG %r28, PT_CR27(%r1)
1781
1782 STREG %r2,-RP_OFFSET(%r30)
1783 ldo FRAME_SIZE(%r30),%r30
1784#ifdef CONFIG_64BIT
1785 ldo -16(%r30),%r29 /* Reference param save area */
1786#endif
1787
1788 /* These are call-clobbered registers and therefore
1789 also syscall-clobbered (we hope). */
1790 STREG %r2,PT_GR19(%r1) /* save for child */
1791 STREG %r30,PT_GR21(%r1)
1792 1697
1793 LDREG PT_GR30(%r1),%r25 1698 LDREG PT_GR30(%r1),%r25
1794 copy %r1,%r24 1699 copy %r1,%r24
1795 BL sys_clone,%r2 1700 b sys_clone
1796 ldi SIGCHLD,%r26 1701 ldi SIGCHLD,%r26
1797
1798 LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2
1799wrapper_exit:
1800 ldo -FRAME_SIZE(%r30),%r30 /* get the stackframe */
1801 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
1802 ldo TASK_REGS(%r1),%r1 /* get pt regs */
1803
1804 LDREG PT_CR27(%r1), %r3
1805 mtctl %r3, %cr27
1806 reg_restore %r1
1807
1808 /* strace expects syscall # to be preserved in r20 */
1809 ldi __NR_fork,%r20
1810 bv %r0(%r2)
1811 STREG %r20,PT_GR20(%r1)
1812ENDPROC(sys_fork_wrapper) 1702ENDPROC(sys_fork_wrapper)
1813 1703
1814 /* Set the return value for the child */ 1704 /* Set the return value for the child */
1815ENTRY(child_return) 1705ENTRY(child_return)
1816 BL schedule_tail, %r2 1706 BL schedule_tail, %r2
1817 nop 1707 nop
1708finish_child_return:
1709 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
1710 ldo TASK_REGS(%r1),%r1 /* get pt regs */
1818 1711
1819 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE-FRAME_SIZE(%r30), %r1 1712 LDREG PT_CR27(%r1), %r3
1820 LDREG TASK_PT_GR19(%r1),%r2 1713 mtctl %r3, %cr27
1821 b wrapper_exit 1714 reg_restore %r1
1715 b syscall_exit
1822 copy %r0,%r28 1716 copy %r0,%r28
1823ENDPROC(child_return) 1717ENDPROC(child_return)
1824 1718
@@ -1827,23 +1721,10 @@ ENTRY(sys_clone_wrapper)
1827 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 1721 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
1828 ldo TASK_REGS(%r1),%r1 /* get pt regs */ 1722 ldo TASK_REGS(%r1),%r1 /* get pt regs */
1829 reg_save %r1 1723 reg_save %r1
1830 mfctl %cr27, %r3 1724 mfctl %cr27, %r28
1831 STREG %r3, PT_CR27(%r1) 1725 STREG %r28, PT_CR27(%r1)
1832 1726 b sys_clone
1833 STREG %r2,-RP_OFFSET(%r30)
1834 ldo FRAME_SIZE(%r30),%r30
1835#ifdef CONFIG_64BIT
1836 ldo -16(%r30),%r29 /* Reference param save area */
1837#endif
1838
1839 /* WARNING - Clobbers r19 and r21, userspace must save these! */
1840 STREG %r2,PT_GR19(%r1) /* save for child */
1841 STREG %r30,PT_GR21(%r1)
1842 BL sys_clone,%r2
1843 copy %r1,%r24 1727 copy %r1,%r24
1844
1845 b wrapper_exit
1846 LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2
1847ENDPROC(sys_clone_wrapper) 1728ENDPROC(sys_clone_wrapper)
1848 1729
1849 1730
@@ -1851,72 +1732,14 @@ ENTRY(sys_vfork_wrapper)
1851 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 1732 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
1852 ldo TASK_REGS(%r1),%r1 /* get pt regs */ 1733 ldo TASK_REGS(%r1),%r1 /* get pt regs */
1853 reg_save %r1 1734 reg_save %r1
1854 mfctl %cr27, %r3 1735 mfctl %cr27, %r28
1855 STREG %r3, PT_CR27(%r1) 1736 STREG %r28, PT_CR27(%r1)
1856 1737
1857 STREG %r2,-RP_OFFSET(%r30) 1738 b sys_vfork
1858 ldo FRAME_SIZE(%r30),%r30
1859#ifdef CONFIG_64BIT
1860 ldo -16(%r30),%r29 /* Reference param save area */
1861#endif
1862
1863 STREG %r2,PT_GR19(%r1) /* save for child */
1864 STREG %r30,PT_GR21(%r1)
1865
1866 BL sys_vfork,%r2
1867 copy %r1,%r26 1739 copy %r1,%r26
1868
1869 b wrapper_exit
1870 LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2
1871ENDPROC(sys_vfork_wrapper) 1740ENDPROC(sys_vfork_wrapper)
1872 1741
1873 1742
1874 .macro execve_wrapper execve
1875 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
1876 ldo TASK_REGS(%r1),%r1 /* get pt regs */
1877
1878 /*
1879 * Do we need to save/restore r3-r18 here?
1880 * I don't think so. why would new thread need old
1881 * threads registers?
1882 */
1883
1884 /* %arg0 - %arg3 are already saved for us. */
1885
1886 STREG %r2,-RP_OFFSET(%r30)
1887 ldo FRAME_SIZE(%r30),%r30
1888#ifdef CONFIG_64BIT
1889 ldo -16(%r30),%r29 /* Reference param save area */
1890#endif
1891 BL \execve,%r2
1892 copy %r1,%arg0
1893
1894 ldo -FRAME_SIZE(%r30),%r30
1895 LDREG -RP_OFFSET(%r30),%r2
1896
1897 /* If exec succeeded we need to load the args */
1898
1899 ldo -1024(%r0),%r1
1900 cmpb,>>= %r28,%r1,error_\execve
1901 copy %r2,%r19
1902
1903error_\execve:
1904 bv %r0(%r19)
1905 nop
1906 .endm
1907
1908 .import sys_execve
1909ENTRY(sys_execve_wrapper)
1910 execve_wrapper sys_execve
1911ENDPROC(sys_execve_wrapper)
1912
1913#ifdef CONFIG_64BIT
1914 .import sys32_execve
1915ENTRY(sys32_execve_wrapper)
1916 execve_wrapper sys32_execve
1917ENDPROC(sys32_execve_wrapper)
1918#endif
1919
1920ENTRY(sys_rt_sigreturn_wrapper) 1743ENTRY(sys_rt_sigreturn_wrapper)
1921 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r26 1744 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r26
1922 ldo TASK_REGS(%r26),%r26 /* get pt regs */ 1745 ldo TASK_REGS(%r26),%r26 /* get pt regs */
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