Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / arm / kernel / sigreturn_codes.S

diff --git a/kernel/arch/arm/kernel/sigreturn_codes.S b/kernel/arch/arm/kernel/sigreturn_codes.S
new file mode 100644 (file)
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--- /dev/null
+++ b/kernel/arch/arm/kernel/sigreturn_codes.S
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+/*
+ * sigreturn_codes.S - code sinpets for sigreturn syscalls
+ *
+ * Created by: Victor Kamensky, 2013-08-13
+ * Copyright:  (C) 2013  Linaro Limited
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <asm/unistd.h>
+
+/*
+ * For ARM syscalls, we encode the syscall number into the instruction.
+ * With EABI, the syscall number has to be loaded into r7. As result
+ * ARM syscall sequence snippet will have move and svc in .arm encoding
+ *
+ * For Thumb syscalls, we pass the syscall number via r7.  We therefore
+ * need two 16-bit instructions in .thumb encoding
+ *
+ * Please note sigreturn_codes code are not executed in place. Instead
+ * they just copied by kernel into appropriate places. Code inside of
+ * arch/arm/kernel/signal.c is very sensitive to layout of these code
+ * snippets.
+ */
+
+/*
+ * In CPU_THUMBONLY case kernel arm opcodes are not allowed.
+ * Note in this case codes skips those instructions but it uses .org
+ * directive to keep correct layout of sigreturn_codes array.
+ */
+#ifndef CONFIG_CPU_THUMBONLY
+#define ARM_OK(code...)        code
+#else
+#define ARM_OK(code...)
+#endif
+
+       .macro arm_slot n
+       .org    sigreturn_codes + 12 * (\n)
+ARM_OK(        .arm    )
+       .endm
+
+       .macro thumb_slot n
+       .org    sigreturn_codes + 12 * (\n) + 8
+       .thumb
+       .endm
+
+#if __LINUX_ARM_ARCH__ <= 4
+       /*
+        * Note we manually set minimally required arch that supports
+        * required thumb opcodes for early arch versions. It is OK
+        * for this file to be used in combination with other
+        * lower arch variants, since these code snippets are only
+        * used as input data.
+        */
+       .arch armv4t
+#endif
+
+       .section .rodata
+       .global sigreturn_codes
+       .type   sigreturn_codes, #object
+
+       .align
+
+sigreturn_codes:
+
+       /* ARM sigreturn syscall code snippet */
+       arm_slot 0
+ARM_OK(        mov     r7, #(__NR_sigreturn - __NR_SYSCALL_BASE)       )
+ARM_OK(        swi     #(__NR_sigreturn)|(__NR_OABI_SYSCALL_BASE)      )
+
+       /* Thumb sigreturn syscall code snippet */
+       thumb_slot 0
+       movs    r7, #(__NR_sigreturn - __NR_SYSCALL_BASE)
+       swi     #0
+
+       /* ARM sigreturn_rt syscall code snippet */
+       arm_slot 1
+ARM_OK(        mov     r7, #(__NR_rt_sigreturn - __NR_SYSCALL_BASE)    )
+ARM_OK(        swi     #(__NR_rt_sigreturn)|(__NR_OABI_SYSCALL_BASE)   )
+
+       /* Thumb sigreturn_rt syscall code snippet */
+       thumb_slot 1
+       movs    r7, #(__NR_rt_sigreturn - __NR_SYSCALL_BASE)
+       swi     #0
+
+       /*
+        * Note on addtional space: setup_return in signal.c
+        * algorithm uses two words copy regardless whether
+        * it is thumb case or not, so we need additional
+        * word after real last entry.
+        */
+       arm_slot 2
+       .space  4
+
+       .size   sigreturn_codes, . - sigreturn_codes