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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /arch/xtensa/kernel/mcount.S
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/xtensa/kernel/mcount.S')
-rw-r--r--arch/xtensa/kernel/mcount.S86
1 files changed, 86 insertions, 0 deletions
diff --git a/arch/xtensa/kernel/mcount.S b/arch/xtensa/kernel/mcount.S
new file mode 100644
index 0000000000..309b329825
--- /dev/null
+++ b/arch/xtensa/kernel/mcount.S
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+/*
+ * arch/xtensa/kernel/mcount.S
+ *
+ * Xtensa specific mcount support
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2013 Tensilica Inc.
+ */
+
+#include <linux/linkage.h>
+#include <asm/asmmacro.h>
+#include <asm/ftrace.h>
+
+/*
+ * Entry condition:
+ *
+ * a2: a0 of the caller in windowed ABI
+ * a10: a0 of the caller in call0 ABI
+ *
+ * In call0 ABI the function _mcount is called with the special ABI:
+ * its argument is in a10 and all the usual argument registers (a2 - a7)
+ * must be preserved in addition to callee-saved a12 - a15.
+ */
+
+ENTRY(_mcount)
+#if defined(__XTENSA_WINDOWED_ABI__)
+ abi_entry_default
+
+ movi a4, ftrace_trace_function
+ l32i a4, a4, 0
+ movi a3, ftrace_stub
+ bne a3, a4, 1f
+ abi_ret_default
+
+1: xor a7, a2, a1
+ movi a3, 0x3fffffff
+ and a7, a7, a3
+ xor a7, a7, a1
+
+ xor a6, a0, a1
+ and a6, a6, a3
+ xor a6, a6, a1
+ addi a6, a6, -MCOUNT_INSN_SIZE
+ callx4 a4
+
+ abi_ret_default
+#elif defined(__XTENSA_CALL0_ABI__)
+ abi_entry_default
+
+ movi a9, ftrace_trace_function
+ l32i a9, a9, 0
+ movi a11, ftrace_stub
+ bne a9, a11, 1f
+ abi_ret_default
+
+1: abi_entry(28)
+ s32i a0, sp, 0
+ s32i a2, sp, 4
+ s32i a3, sp, 8
+ s32i a4, sp, 12
+ s32i a5, sp, 16
+ s32i a6, sp, 20
+ s32i a7, sp, 24
+ addi a2, a10, -MCOUNT_INSN_SIZE
+ callx0 a9
+ l32i a0, sp, 0
+ l32i a2, sp, 4
+ l32i a3, sp, 8
+ l32i a4, sp, 12
+ l32i a5, sp, 16
+ l32i a6, sp, 20
+ l32i a7, sp, 24
+ abi_ret(28)
+#else
+#error Unsupported Xtensa ABI
+#endif
+ENDPROC(_mcount)
+EXPORT_SYMBOL(_mcount)
+
+ENTRY(ftrace_stub)
+ abi_entry_default
+ abi_ret_default
+ENDPROC(ftrace_stub)