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Diffstat (limited to 'arch/xtensa/kernel/process.c')
-rw-r--r--arch/xtensa/kernel/process.c63
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));
}
/*