Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 167 insertions, 0 deletions

diff --git a/arch/s390/kernel/mcount.S b/arch/s390/kernel/mcount.S
new file mode 100644
index 000000000..4786bfe02
--- /dev/null
+++ b/arch/s390/kernel/mcount.S
@@ -0,0 +1,167 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright IBM Corp. 2008, 2009
+ *
+ */
+
+#include <linux/linkage.h>
+#include <asm/asm-offsets.h>
+#include <asm/ftrace.h>
+#include <asm/nospec-insn.h>
+#include <asm/ptrace.h>
+#include <asm/export.h>
+
+
+#define STACK_FRAME_SIZE	(STACK_FRAME_OVERHEAD + __PT_SIZE)
+#define STACK_PTREGS		(STACK_FRAME_OVERHEAD)
+#define STACK_PTREGS_GPRS	(STACK_PTREGS + __PT_GPRS)
+#define STACK_PTREGS_PSW	(STACK_PTREGS + __PT_PSW)
+#define STACK_PTREGS_ORIG_GPR2	(STACK_PTREGS + __PT_ORIG_GPR2)
+#define STACK_PTREGS_FLAGS	(STACK_PTREGS + __PT_FLAGS)
+/* packed stack: allocate just enough for r14, r15 and backchain */
+#define TRACED_FUNC_FRAME_SIZE	24
+
+#ifdef CONFIG_FUNCTION_TRACER
+
+	GEN_BR_THUNK %r1
+	GEN_BR_THUNK %r14
+
+	.section .kprobes.text, "ax"
+
+ENTRY(ftrace_stub)
+	BR_EX	%r14
+ENDPROC(ftrace_stub)
+
+	.macro	ftrace_regs_entry, allregs=0
+	stg	%r14,(__SF_GPRS+8*8)(%r15)	# save traced function caller
+
+	.if \allregs == 1
+	# save psw mask
+	# don't put any instructions clobbering CC before this point
+	epsw	%r1,%r14
+	risbg	%r14,%r1,0,31,32
+	.endif
+
+	lgr	%r1,%r15
+	# allocate stack frame for ftrace_caller to contain traced function
+	aghi	%r15,-TRACED_FUNC_FRAME_SIZE
+	stg	%r1,__SF_BACKCHAIN(%r15)
+	stg	%r0,(__SF_GPRS+8*8)(%r15)
+	stg	%r15,(__SF_GPRS+9*8)(%r15)
+	# allocate pt_regs and stack frame for ftrace_trace_function
+	aghi	%r15,-STACK_FRAME_SIZE
+	stg	%r1,(STACK_PTREGS_GPRS+15*8)(%r15)
+	xc	STACK_PTREGS_ORIG_GPR2(8,%r15),STACK_PTREGS_ORIG_GPR2(%r15)
+
+	.if \allregs == 1
+	stg	%r14,(STACK_PTREGS_PSW)(%r15)
+	mvghi	STACK_PTREGS_FLAGS(%r15),_PIF_FTRACE_FULL_REGS
+	.else
+	xc	STACK_PTREGS_FLAGS(8,%r15),STACK_PTREGS_FLAGS(%r15)
+	.endif
+
+	lg	%r14,(__SF_GPRS+8*8)(%r1)	# restore original return address
+	aghi	%r1,-TRACED_FUNC_FRAME_SIZE
+	stg	%r1,__SF_BACKCHAIN(%r15)
+	stg	%r0,(STACK_PTREGS_PSW+8)(%r15)
+	stmg	%r2,%r14,(STACK_PTREGS_GPRS+2*8)(%r15)
+	.endm
+
+SYM_CODE_START(ftrace_regs_caller)
+	ftrace_regs_entry	1
+	j	ftrace_common
+SYM_CODE_END(ftrace_regs_caller)
+
+SYM_CODE_START(ftrace_caller)
+	ftrace_regs_entry	0
+	j	ftrace_common
+SYM_CODE_END(ftrace_caller)
+
+SYM_CODE_START(ftrace_common)
+#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
+	aghik	%r2,%r0,-MCOUNT_INSN_SIZE
+	lgrl	%r4,function_trace_op
+	lgrl	%r1,ftrace_func
+#else
+	lgr	%r2,%r0
+	aghi	%r2,-MCOUNT_INSN_SIZE
+	larl	%r4,function_trace_op
+	lg	%r4,0(%r4)
+	larl	%r1,ftrace_func
+	lg	%r1,0(%r1)
+#endif
+	lgr	%r3,%r14
+	la	%r5,STACK_PTREGS(%r15)
+	BASR_EX	%r14,%r1
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+# The j instruction gets runtime patched to a nop instruction.
+# See ftrace_enable_ftrace_graph_caller.
+SYM_INNER_LABEL(ftrace_graph_caller, SYM_L_GLOBAL)
+	j	.Lftrace_graph_caller_end
+	lmg	%r2,%r3,(STACK_PTREGS_GPRS+14*8)(%r15)
+	lg	%r4,(STACK_PTREGS_PSW+8)(%r15)
+	brasl	%r14,prepare_ftrace_return
+	stg	%r2,(STACK_PTREGS_GPRS+14*8)(%r15)
+.Lftrace_graph_caller_end:
+#endif
+	lg	%r0,(STACK_PTREGS_PSW+8)(%r15)
+#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
+	ltg	%r1,STACK_PTREGS_ORIG_GPR2(%r15)
+	locgrz	%r1,%r0
+#else
+	lg	%r1,STACK_PTREGS_ORIG_GPR2(%r15)
+	ltgr	%r1,%r1
+	jnz	0f
+	lgr	%r1,%r0
+#endif
+0:	lmg	%r2,%r15,(STACK_PTREGS_GPRS+2*8)(%r15)
+	BR_EX	%r1
+SYM_CODE_END(ftrace_common)
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+
+SYM_FUNC_START(return_to_handler)
+	stmg	%r2,%r5,32(%r15)
+	lgr	%r1,%r15
+	aghi	%r15,-STACK_FRAME_OVERHEAD
+	stg	%r1,__SF_BACKCHAIN(%r15)
+	brasl	%r14,ftrace_return_to_handler
+	aghi	%r15,STACK_FRAME_OVERHEAD
+	lgr	%r14,%r2
+	lmg	%r2,%r5,32(%r15)
+	BR_EX	%r14
+SYM_FUNC_END(return_to_handler)
+
+#endif
+#endif /* CONFIG_FUNCTION_TRACER */
+
+#ifdef CONFIG_KPROBES
+
+SYM_FUNC_START(__kretprobe_trampoline)
+
+	stg	%r14,(__SF_GPRS+8*8)(%r15)
+	lay	%r15,-STACK_FRAME_SIZE(%r15)
+	stmg	%r0,%r14,STACK_PTREGS_GPRS(%r15)
+
+	# store original stack pointer in backchain and pt_regs
+	lay	%r7,STACK_FRAME_SIZE(%r15)
+	stg	%r7,__SF_BACKCHAIN(%r15)
+	stg	%r7,STACK_PTREGS_GPRS+(15*8)(%r15)
+
+	# store full psw
+	epsw	%r2,%r3
+	risbg	%r3,%r2,0,31,32
+	stg	%r3,STACK_PTREGS_PSW(%r15)
+	larl	%r1,__kretprobe_trampoline
+	stg	%r1,STACK_PTREGS_PSW+8(%r15)
+
+	lay	%r2,STACK_PTREGS(%r15)
+	brasl	%r14,trampoline_probe_handler
+
+	mvc	__SF_EMPTY(16,%r7),STACK_PTREGS_PSW(%r15)
+	lmg	%r0,%r15,STACK_PTREGS_GPRS(%r15)
+	lpswe	__SF_EMPTY(%r15)
+
+SYM_FUNC_END(__kretprobe_trampoline)
+
+#endif /* CONFIG_KPROBES */