Adding upstream version 5.10.209.upstream/5.10.209upstream

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

1 files changed, 334 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/ptrace.h b/arch/powerpc/include/asm/ptrace.h
new file mode 100644
index 000000000..a7e7688f5
--- /dev/null
+++ b/arch/powerpc/include/asm/ptrace.h
@@ -0,0 +1,334 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2001 PPC64 Team, IBM Corp
+ *
+ * This struct defines the way the registers are stored on the
+ * kernel stack during a system call or other kernel entry.
+ *
+ * this should only contain volatile regs
+ * since we can keep non-volatile in the thread_struct
+ * should set this up when only volatiles are saved
+ * by intr code.
+ *
+ * Since this is going on the stack, *CARE MUST BE TAKEN* to insure
+ * that the overall structure is a multiple of 16 bytes in length.
+ *
+ * Note that the offsets of the fields in this struct correspond with
+ * the PT_* values below.  This simplifies arch/powerpc/kernel/ptrace.c.
+ */
+#ifndef _ASM_POWERPC_PTRACE_H
+#define _ASM_POWERPC_PTRACE_H
+
+#include <linux/err.h>
+#include <uapi/asm/ptrace.h>
+#include <asm/asm-const.h>
+
+#ifndef __ASSEMBLY__
+struct pt_regs
+{
+	union {
+		struct user_pt_regs user_regs;
+		struct {
+			unsigned long gpr[32];
+			unsigned long nip;
+			unsigned long msr;
+			unsigned long orig_gpr3;
+			unsigned long ctr;
+			unsigned long link;
+			unsigned long xer;
+			unsigned long ccr;
+#ifdef CONFIG_PPC64
+			unsigned long softe;
+#else
+			unsigned long mq;
+#endif
+			unsigned long trap;
+			unsigned long dar;
+			unsigned long dsisr;
+			unsigned long result;
+		};
+	};
+
+	union {
+		struct {
+#ifdef CONFIG_PPC64
+			unsigned long ppr;
+#endif
+#ifdef CONFIG_PPC_KUAP
+			unsigned long kuap;
+#endif
+		};
+		unsigned long __pad[2];	/* Maintain 16 byte interrupt stack alignment */
+	};
+};
+#endif
+
+
+#define STACK_FRAME_WITH_PT_REGS (STACK_FRAME_OVERHEAD + sizeof(struct pt_regs))
+
+#ifdef __powerpc64__
+
+/*
+ * Size of redzone that userspace is allowed to use below the stack
+ * pointer.  This is 288 in the 64-bit big-endian ELF ABI, and 512 in
+ * the new ELFv2 little-endian ABI, so we allow the larger amount.
+ *
+ * For kernel code we allow a 288-byte redzone, in order to conserve
+ * kernel stack space; gcc currently only uses 288 bytes, and will
+ * hopefully allow explicit control of the redzone size in future.
+ */
+#define USER_REDZONE_SIZE	512
+#define KERNEL_REDZONE_SIZE	288
+
+#define STACK_FRAME_OVERHEAD	112	/* size of minimum stack frame */
+#define STACK_FRAME_LR_SAVE	2	/* Location of LR in stack frame */
+#define STACK_FRAME_REGS_MARKER	ASM_CONST(0x7265677368657265)
+#define STACK_INT_FRAME_SIZE	(sizeof(struct pt_regs) + \
+				 STACK_FRAME_OVERHEAD + KERNEL_REDZONE_SIZE)
+#define STACK_FRAME_MARKER	12
+
+#ifdef PPC64_ELF_ABI_v2
+#define STACK_FRAME_MIN_SIZE	32
+#else
+#define STACK_FRAME_MIN_SIZE	STACK_FRAME_OVERHEAD
+#endif
+
+/* Size of dummy stack frame allocated when calling signal handler. */
+#define __SIGNAL_FRAMESIZE	128
+#define __SIGNAL_FRAMESIZE32	64
+
+#else /* __powerpc64__ */
+
+#define USER_REDZONE_SIZE	0
+#define KERNEL_REDZONE_SIZE	0
+#define STACK_FRAME_OVERHEAD	16	/* size of minimum stack frame */
+#define STACK_FRAME_LR_SAVE	1	/* Location of LR in stack frame */
+#define STACK_FRAME_REGS_MARKER	ASM_CONST(0x72656773)
+#define STACK_INT_FRAME_SIZE	(sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD)
+#define STACK_FRAME_MARKER	2
+#define STACK_FRAME_MIN_SIZE	STACK_FRAME_OVERHEAD
+
+/* Size of stack frame allocated when calling signal handler. */
+#define __SIGNAL_FRAMESIZE	64
+
+#endif /* __powerpc64__ */
+
+#ifndef __ASSEMBLY__
+
+static inline unsigned long instruction_pointer(struct pt_regs *regs)
+{
+	return regs->nip;
+}
+
+static inline void instruction_pointer_set(struct pt_regs *regs,
+		unsigned long val)
+{
+	regs->nip = val;
+}
+
+static inline unsigned long user_stack_pointer(struct pt_regs *regs)
+{
+	return regs->gpr[1];
+}
+
+static inline unsigned long frame_pointer(struct pt_regs *regs)
+{
+	return 0;
+}
+
+#ifdef CONFIG_SMP
+extern unsigned long profile_pc(struct pt_regs *regs);
+#else
+#define profile_pc(regs) instruction_pointer(regs)
+#endif
+
+long do_syscall_trace_enter(struct pt_regs *regs);
+void do_syscall_trace_leave(struct pt_regs *regs);
+
+#ifdef __powerpc64__
+#define user_mode(regs) ((((regs)->msr) >> MSR_PR_LG) & 0x1)
+#else
+#define user_mode(regs) (((regs)->msr & MSR_PR) != 0)
+#endif
+
+#define force_successful_syscall_return()   \
+	do { \
+		set_thread_flag(TIF_NOERROR); \
+	} while(0)
+
+struct task_struct;
+extern int ptrace_get_reg(struct task_struct *task, int regno,
+			  unsigned long *data);
+extern int ptrace_put_reg(struct task_struct *task, int regno,
+			  unsigned long data);
+
+#define current_pt_regs() \
+	((struct pt_regs *)((unsigned long)task_stack_page(current) + THREAD_SIZE) - 1)
+
+#ifdef __powerpc64__
+#ifdef CONFIG_PPC_BOOK3S
+#define TRAP_FLAGS_MASK		0x10
+#define TRAP(regs)		((regs)->trap & ~TRAP_FLAGS_MASK)
+#define FULL_REGS(regs)		true
+#define SET_FULL_REGS(regs)	do { } while (0)
+#else
+#define TRAP_FLAGS_MASK		0x11
+#define TRAP(regs)		((regs)->trap & ~TRAP_FLAGS_MASK)
+#define FULL_REGS(regs)		(((regs)->trap & 1) == 0)
+#define SET_FULL_REGS(regs)	((regs)->trap &= ~1)
+#endif
+#define CHECK_FULL_REGS(regs)	BUG_ON(!FULL_REGS(regs))
+#define NV_REG_POISON		0xdeadbeefdeadbeefUL
+#else
+/*
+ * We use the least-significant bit of the trap field to indicate
+ * whether we have saved the full set of registers, or only a
+ * partial set.  A 1 there means the partial set.
+ * On 4xx we use the next bit to indicate whether the exception
+ * is a critical exception (1 means it is).
+ */
+#define TRAP_FLAGS_MASK		0x1F
+#define TRAP(regs)		((regs)->trap & ~TRAP_FLAGS_MASK)
+#define FULL_REGS(regs)		(((regs)->trap & 1) == 0)
+#define SET_FULL_REGS(regs)	((regs)->trap &= ~1)
+#define IS_CRITICAL_EXC(regs)	(((regs)->trap & 2) != 0)
+#define IS_MCHECK_EXC(regs)	(((regs)->trap & 4) != 0)
+#define IS_DEBUG_EXC(regs)	(((regs)->trap & 8) != 0)
+#define NV_REG_POISON		0xdeadbeef
+#define CHECK_FULL_REGS(regs)						      \
+do {									      \
+	if ((regs)->trap & 1)						      \
+		printk(KERN_CRIT "%s: partial register set\n", __func__); \
+} while (0)
+#endif /* __powerpc64__ */
+
+static inline void set_trap(struct pt_regs *regs, unsigned long val)
+{
+	regs->trap = (regs->trap & TRAP_FLAGS_MASK) | (val & ~TRAP_FLAGS_MASK);
+}
+
+static inline bool trap_is_scv(struct pt_regs *regs)
+{
+	return (IS_ENABLED(CONFIG_PPC_BOOK3S_64) && TRAP(regs) == 0x3000);
+}
+
+static inline bool trap_is_syscall(struct pt_regs *regs)
+{
+	return (trap_is_scv(regs) || TRAP(regs) == 0xc00);
+}
+
+static inline bool trap_norestart(struct pt_regs *regs)
+{
+	return regs->trap & 0x10;
+}
+
+static inline void set_trap_norestart(struct pt_regs *regs)
+{
+	regs->trap |= 0x10;
+}
+
+#define kernel_stack_pointer(regs) ((regs)->gpr[1])
+static inline int is_syscall_success(struct pt_regs *regs)
+{
+	if (trap_is_scv(regs))
+		return !IS_ERR_VALUE((unsigned long)regs->gpr[3]);
+	else
+		return !(regs->ccr & 0x10000000);
+}
+
+static inline long regs_return_value(struct pt_regs *regs)
+{
+	if (trap_is_scv(regs))
+		return regs->gpr[3];
+
+	if (is_syscall_success(regs))
+		return regs->gpr[3];
+	else
+		return -regs->gpr[3];
+}
+
+static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc)
+{
+	regs->gpr[3] = rc;
+}
+
+#define arch_has_single_step()	(1)
+#define arch_has_block_step()	(true)
+#define ARCH_HAS_USER_SINGLE_STEP_REPORT
+
+/*
+ * kprobe-based event tracer support
+ */
+
+#include <linux/stddef.h>
+#include <linux/thread_info.h>
+extern int regs_query_register_offset(const char *name);
+extern const char *regs_query_register_name(unsigned int offset);
+#define MAX_REG_OFFSET (offsetof(struct pt_regs, dsisr))
+
+/**
+ * regs_get_register() - get register value from its offset
+ * @regs:	   pt_regs from which register value is gotten
+ * @offset:    offset number of the register.
+ *
+ * regs_get_register returns the value of a register whose offset from @regs.
+ * The @offset is the offset of the register in struct pt_regs.
+ * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
+ */
+static inline unsigned long regs_get_register(struct pt_regs *regs,
+						unsigned int offset)
+{
+	if (unlikely(offset > MAX_REG_OFFSET))
+		return 0;
+	return *(unsigned long *)((unsigned long)regs + offset);
+}
+
+/**
+ * regs_within_kernel_stack() - check the address in the stack
+ * @regs:      pt_regs which contains kernel stack pointer.
+ * @addr:      address which is checked.
+ *
+ * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
+ * If @addr is within the kernel stack, it returns true. If not, returns false.
+ */
+
+static inline bool regs_within_kernel_stack(struct pt_regs *regs,
+						unsigned long addr)
+{
+	return ((addr & ~(THREAD_SIZE - 1))  ==
+		(kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
+}
+
+/**
+ * regs_get_kernel_stack_nth() - get Nth entry of the stack
+ * @regs:	pt_regs which contains kernel stack pointer.
+ * @n:		stack entry number.
+ *
+ * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
+ * is specified by @regs. If the @n th entry is NOT in the kernel stack,
+ * this returns 0.
+ */
+static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
+						      unsigned int n)
+{
+	unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
+	addr += n;
+	if (regs_within_kernel_stack(regs, (unsigned long)addr))
+		return *addr;
+	else
+		return 0;
+}
+
+#endif /* __ASSEMBLY__ */
+
+#ifndef __powerpc64__
+/* We need PT_SOFTE defined at all time to avoid #ifdefs */
+#define PT_SOFTE PT_MQ
+#else /* __powerpc64__ */
+#define PT_FPSCR32 (PT_FPR0 + 2*32 + 1)	/* each FP reg occupies 2 32-bit userspace slots */
+#define PT_VR0_32 164	/* each Vector reg occupies 4 slots in 32-bit */
+#define PT_VSCR_32 (PT_VR0 + 32*4 + 3)
+#define PT_VRSAVE_32 (PT_VR0 + 33*4)
+#define PT_VSR0_32 300 	/* each VSR reg occupies 4 slots in 32-bit */
+#endif /* __powerpc64__ */
+#endif /* _ASM_POWERPC_PTRACE_H */