1 files changed, 6 insertions, 57 deletions

diff --git a/arch/xtensa/kernel/process.c b/arch/xtensa/kernel/process.c
index f53d7bd9dfb2..026138d641a4 100644
--- a/arch/xtensa/kernel/process.c
+++ b/arch/xtensa/kernel/process.c
@@ -194,51 +194,18 @@ unsigned long get_wchan(struct task_struct *p)
 void do_copy_regs (xtensa_gregset_t *elfregs, struct pt_regs *regs,
                    struct task_struct *tsk)
 {
-        int i, n, wb_offset;
-
-        elfregs->xchal_config_id0 = XCHAL_HW_CONFIGID0;
-        elfregs->xchal_config_id1 = XCHAL_HW_CONFIGID1;
-
-        __asm__ __volatile__ ("rsr  %0, 176\n" : "=a" (i));
-        elfregs->cpux = i;
-        __asm__ __volatile__ ("rsr  %0, 208\n" : "=a" (i));
-        elfregs->cpuy = i;
-
         /* Note:  PS.EXCM is not set while user task is running; its
          * being set in regs->ps is for exception handling convenience.
          */
 
         elfregs->pc             = regs->pc;
         elfregs->ps             = (regs->ps & ~(1 << PS_EXCM_BIT));
-        elfregs->exccause       = regs->exccause;
-        elfregs->excvaddr       = regs->excvaddr;
-        elfregs->windowbase     = regs->windowbase;
-        elfregs->windowstart    = regs->windowstart;
         elfregs->lbeg           = regs->lbeg;
         elfregs->lend           = regs->lend;
         elfregs->lcount         = regs->lcount;
         elfregs->sar            = regs->sar;
-        elfregs->syscall        = regs->syscall;
-
-        /* Copy register file.
-         * The layout looks like this:
-         *
-         * |  a0 ... a15  | Z ... Z |  arX ... arY  |
-         *  current window  unused    saved frames
-         */
-
-        memset (elfregs->ar, 0, sizeof(elfregs->ar));
-
-        wb_offset = regs->windowbase * 4;
-        n = (regs->wmask&1)? 4 : (regs->wmask&2)? 8 : (regs->wmask&4)? 12 : 16;
-
-        for (i = 0; i < n; i++)
-                elfregs->ar[(wb_offset + i) % XCHAL_NUM_AREGS] = regs->areg[i];
 
-        n = (regs->wmask >> 4) * 4;
-
-        for (i = XCHAL_NUM_AREGS - n; n > 0; i++, n--)
-                elfregs->ar[(wb_offset + i) % XCHAL_NUM_AREGS] = regs->areg[i];
+        memcpy (elfregs->a, regs->areg, sizeof(elfregs->a));
 }
 
 void xtensa_elf_core_copy_regs (xtensa_gregset_t *elfregs, struct pt_regs *regs)
@@ -252,40 +219,22 @@ void xtensa_elf_core_copy_regs (xtensa_gregset_t *elfregs, struct pt_regs *regs)
 void do_restore_regs (xtensa_gregset_t *elfregs, struct pt_regs *regs,
                       struct task_struct *tsk)
 {
-        int i, n, wb_offset;
+        const unsigned long ps_mask = PS_CALLINC_MASK | PS_OWB_MASK;
+        unsigned long ps;
 
         /* Note:  PS.EXCM is not set while user task is running; it
          * needs to be set in regs->ps is for exception handling convenience.
          */
 
+        ps = (regs->ps & ~ps_mask) | (elfregs->ps & ps_mask) | (1<<PS_EXCM_BIT);
+        regs->ps                = ps;
         regs->pc                = elfregs->pc;
-        regs->ps                = (elfregs->ps | (1 << PS_EXCM_BIT));
-        regs->exccause          = elfregs->exccause;
-        regs->excvaddr          = elfregs->excvaddr;
-        regs->windowbase        = elfregs->windowbase;
-        regs->windowstart       = elfregs->windowstart;
         regs->lbeg              = elfregs->lbeg;
         regs->lend              = elfregs->lend;
         regs->lcount            = elfregs->lcount;
         regs->sar               = elfregs->sar;
-        regs->syscall   = elfregs->syscall;
-
-        /* Clear everything. */
-
-        memset (regs->areg, 0, sizeof(regs->areg));
-
-        /* Copy regs from live window frame. */
-
-        wb_offset = regs->windowbase * 4;
-        n = (regs->wmask&1)? 4 : (regs->wmask&2)? 8 : (regs->wmask&4)? 12 : 16;
-
-        for (i = 0; i < n; i++)
-                regs->areg[(wb_offset+i) % XCHAL_NUM_AREGS] = elfregs->ar[i];
-
-        n = (regs->wmask >> 4) * 4;
 
-        for (i = XCHAL_NUM_AREGS - n; n > 0; i++, n--)
-                regs->areg[(wb_offset+i) % XCHAL_NUM_AREGS] = elfregs->ar[i];
+        memcpy (regs->areg, elfregs->a, sizeof(regs->areg));
 }
 
 /*