[XTENSA] Remove non-rt signal handling

The non-rt signal handling was never really used, so we don't break
anything. This patch also cleans up the signal stack-frame to make
it independent from the processor configuration. It also improves
the method used for controlling single-stepping. We now save and
restore the 'icountlevel' register that controls single stepping
and set or clear the saved state to enable or disable it.

Signed-off-by: Chris Zankel <chris@zankel.net>

5 files changed, 16 insertions, 26 deletions

diff --git a/include/asm-xtensa/coprocessor.h b/include/asm-xtensa/coprocessor.h
index bd09ec02d57f..aa2121034558 100644
--- a/include/asm-xtensa/coprocessor.h
+++ b/include/asm-xtensa/coprocessor.h
@@ -64,6 +64,7 @@ typedef struct {
 #  define COPROCESSOR_INFO_SIZE 8
 # endif
 #endif
+#endif  /* XCHAL_HAVE_CP */
 
 
 #ifndef __ASSEMBLY__
@@ -74,8 +75,11 @@ extern void save_coprocessor_registers(void*, int);
 # else
 #  define release_coprocessors(task)
 # endif
-#endif
 
-#endif
+typedef unsigned char cp_state_t[XTENSA_CP_EXTRA_SIZE]
+        __attribute__ ((aligned (XTENSA_CP_EXTRA_ALIGN)));
+
+#endif  /* !__ASSEMBLY__ */
+
 
 #endif  /* _XTENSA_COPROCESSOR_H */
diff --git a/include/asm-xtensa/elf.h b/include/asm-xtensa/elf.h
index f0f9fd8560a5..1569b53cec91 100644
--- a/include/asm-xtensa/elf.h
+++ b/include/asm-xtensa/elf.h
@@ -13,7 +13,6 @@
 #ifndef _XTENSA_ELF_H
 #define _XTENSA_ELF_H
 
-#include <asm/variant/core.h>
 #include <asm/ptrace.h>
 
 /* Xtensa processor ELF architecture-magic number */
@@ -49,7 +48,7 @@ typedef struct {
         elf_greg_t lcount;
         elf_greg_t sar;
         elf_greg_t syscall;
-        elf_greg_t ar[XCHAL_NUM_AREGS];
+        elf_greg_t ar[64];
 } xtensa_gregset_t;
 
 #define ELF_NGREG       (sizeof(xtensa_gregset_t) / sizeof(elf_greg_t))
diff --git a/include/asm-xtensa/ptrace.h b/include/asm-xtensa/ptrace.h
index cad83e814d69..77ff02d307bb 100644
--- a/include/asm-xtensa/ptrace.h
+++ b/include/asm-xtensa/ptrace.h
@@ -99,7 +99,8 @@ struct pt_regs {
         unsigned long windowbase;       /*  48 */
         unsigned long windowstart;      /*  52 */
         unsigned long syscall;          /*  56 */
-        int reserved[2];                /*  64 */
+        unsigned long icountlevel;      /*  60 */
+        int reserved[1];                /*  64 */
 
         /* Make sure the areg field is 16 bytes aligned. */
         int align[0] __attribute__ ((aligned(16)));
diff --git a/include/asm-xtensa/sigcontext.h b/include/asm-xtensa/sigcontext.h
index a75177291418..e3381cee5059 100644
--- a/include/asm-xtensa/sigcontext.h
+++ b/include/asm-xtensa/sigcontext.h
@@ -5,21 +5,12 @@
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  *
- * Copyright (C) 2001 - 2003 Tensilica Inc.
+ * Copyright (C) 2001 - 2007 Tensilica Inc.
  */
 
 #ifndef _XTENSA_SIGCONTEXT_H
 #define _XTENSA_SIGCONTEXT_H
 
-#define _ASMLANGUAGE
-#include <asm/processor.h>
-#include <asm/coprocessor.h>
-
-
-struct _cpstate {
-        unsigned char _cpstate[XTENSA_CP_EXTRA_SIZE];
-} __attribute__ ((aligned (XTENSA_CP_EXTRA_ALIGN)));
-
 
 struct sigcontext {
         unsigned long   oldmask;
@@ -27,18 +18,13 @@ struct sigcontext {
         /* CPU registers */
         unsigned long sc_pc;
         unsigned long sc_ps;
-        unsigned long sc_wmask;
-        unsigned long sc_windowbase;
-        unsigned long sc_windowstart;
         unsigned long sc_lbeg;
         unsigned long sc_lend;
         unsigned long sc_lcount;
         unsigned long sc_sar;
-        unsigned long sc_depc;
-        unsigned long sc_dareg0;
-        unsigned long sc_treg[4];
-        unsigned long sc_areg[XCHAL_NUM_AREGS];
-        struct _cpstate *sc_cpstate;
+        unsigned long sc_acclo;
+        unsigned long sc_acchi;
+        unsigned long sc_a[16];
 };
 
-#endif /* __ASM_XTENSA_SIGCONTEXT_H */
+#endif /* _XTENSA_SIGCONTEXT_H */
diff --git a/include/asm-xtensa/unistd.h b/include/asm-xtensa/unistd.h
index 8a7fb6964ce1..9bd34024431c 100644
--- a/include/asm-xtensa/unistd.h
+++ b/include/asm-xtensa/unistd.h
@@ -485,8 +485,8 @@ __SYSCALL(217, sys_sched_get_priority_min, 1)
 __SYSCALL(218, sys_sched_rr_get_interval, 2)
 #define __NR_sched_yield                        219
 __SYSCALL(219, sys_sched_yield, 0)
-#define __NR_sigreturn                          222
-__SYSCALL(222, xtensa_sigreturn, 0)
+#define __NR_available222                       222
+__SYSCALL(222, sys_ni_syscall, 0)
 
 /* Signal Handling */