Adding upstream version 4.19.249.upstream/4.19.249upstream

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

1 files changed, 310 insertions, 0 deletions

diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h
new file mode 100644
index 000000000..163970d5c
--- /dev/null
+++ b/arch/arm64/include/asm/ptrace.h
@@ -0,0 +1,310 @@
+/*
+ * Based on arch/arm/include/asm/ptrace.h
+ *
+ * Copyright (C) 1996-2003 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_PTRACE_H
+#define __ASM_PTRACE_H
+
+#include <uapi/asm/ptrace.h>
+
+/* Current Exception Level values, as contained in CurrentEL */
+#define CurrentEL_EL1		(1 << 2)
+#define CurrentEL_EL2		(2 << 2)
+
+/* AArch32-specific ptrace requests */
+#define COMPAT_PTRACE_GETREGS		12
+#define COMPAT_PTRACE_SETREGS		13
+#define COMPAT_PTRACE_GET_THREAD_AREA	22
+#define COMPAT_PTRACE_SET_SYSCALL	23
+#define COMPAT_PTRACE_GETVFPREGS	27
+#define COMPAT_PTRACE_SETVFPREGS	28
+#define COMPAT_PTRACE_GETHBPREGS	29
+#define COMPAT_PTRACE_SETHBPREGS	30
+
+/* SPSR_ELx bits for exceptions taken from AArch32 */
+#define PSR_AA32_MODE_MASK	0x0000001f
+#define PSR_AA32_MODE_USR	0x00000010
+#define PSR_AA32_MODE_FIQ	0x00000011
+#define PSR_AA32_MODE_IRQ	0x00000012
+#define PSR_AA32_MODE_SVC	0x00000013
+#define PSR_AA32_MODE_ABT	0x00000017
+#define PSR_AA32_MODE_HYP	0x0000001a
+#define PSR_AA32_MODE_UND	0x0000001b
+#define PSR_AA32_MODE_SYS	0x0000001f
+#define PSR_AA32_T_BIT		0x00000020
+#define PSR_AA32_F_BIT		0x00000040
+#define PSR_AA32_I_BIT		0x00000080
+#define PSR_AA32_A_BIT		0x00000100
+#define PSR_AA32_E_BIT		0x00000200
+#define PSR_AA32_PAN_BIT	0x00400000
+#define PSR_AA32_SSBS_BIT	0x00800000
+#define PSR_AA32_DIT_BIT	0x01000000
+#define PSR_AA32_Q_BIT		0x08000000
+#define PSR_AA32_V_BIT		0x10000000
+#define PSR_AA32_C_BIT		0x20000000
+#define PSR_AA32_Z_BIT		0x40000000
+#define PSR_AA32_N_BIT		0x80000000
+#define PSR_AA32_IT_MASK	0x0600fc00	/* If-Then execution state mask */
+#define PSR_AA32_GE_MASK	0x000f0000
+
+#ifdef CONFIG_CPU_BIG_ENDIAN
+#define PSR_AA32_ENDSTATE	PSR_AA32_E_BIT
+#else
+#define PSR_AA32_ENDSTATE	0
+#endif
+
+/* AArch32 CPSR bits, as seen in AArch32 */
+#define COMPAT_PSR_DIT_BIT	0x00200000
+
+/*
+ * These are 'magic' values for PTRACE_PEEKUSR that return info about where a
+ * process is located in memory.
+ */
+#define COMPAT_PT_TEXT_ADDR		0x10000
+#define COMPAT_PT_DATA_ADDR		0x10004
+#define COMPAT_PT_TEXT_END_ADDR		0x10008
+
+/*
+ * If pt_regs.syscallno == NO_SYSCALL, then the thread is not executing
+ * a syscall -- i.e., its most recent entry into the kernel from
+ * userspace was not via SVC, or otherwise a tracer cancelled the syscall.
+ *
+ * This must have the value -1, for ABI compatibility with ptrace etc.
+ */
+#define NO_SYSCALL (-1)
+
+#ifndef __ASSEMBLY__
+#include <linux/bug.h>
+#include <linux/types.h>
+
+/* sizeof(struct user) for AArch32 */
+#define COMPAT_USER_SZ	296
+
+/* Architecturally defined mapping between AArch32 and AArch64 registers */
+#define compat_usr(x)	regs[(x)]
+#define compat_fp	regs[11]
+#define compat_sp	regs[13]
+#define compat_lr	regs[14]
+#define compat_sp_hyp	regs[15]
+#define compat_lr_irq	regs[16]
+#define compat_sp_irq	regs[17]
+#define compat_lr_svc	regs[18]
+#define compat_sp_svc	regs[19]
+#define compat_lr_abt	regs[20]
+#define compat_sp_abt	regs[21]
+#define compat_lr_und	regs[22]
+#define compat_sp_und	regs[23]
+#define compat_r8_fiq	regs[24]
+#define compat_r9_fiq	regs[25]
+#define compat_r10_fiq	regs[26]
+#define compat_r11_fiq	regs[27]
+#define compat_r12_fiq	regs[28]
+#define compat_sp_fiq	regs[29]
+#define compat_lr_fiq	regs[30]
+
+static inline unsigned long compat_psr_to_pstate(const unsigned long psr)
+{
+	unsigned long pstate;
+
+	pstate = psr & ~COMPAT_PSR_DIT_BIT;
+
+	if (psr & COMPAT_PSR_DIT_BIT)
+		pstate |= PSR_AA32_DIT_BIT;
+
+	return pstate;
+}
+
+static inline unsigned long pstate_to_compat_psr(const unsigned long pstate)
+{
+	unsigned long psr;
+
+	psr = pstate & ~PSR_AA32_DIT_BIT;
+
+	if (pstate & PSR_AA32_DIT_BIT)
+		psr |= COMPAT_PSR_DIT_BIT;
+
+	return psr;
+}
+
+/*
+ * This struct defines the way the registers are stored on the stack during an
+ * exception. Note that sizeof(struct pt_regs) has to be a multiple of 16 (for
+ * stack alignment). struct user_pt_regs must form a prefix of struct pt_regs.
+ */
+struct pt_regs {
+	union {
+		struct user_pt_regs user_regs;
+		struct {
+			u64 regs[31];
+			u64 sp;
+			u64 pc;
+			u64 pstate;
+		};
+	};
+	u64 orig_x0;
+#ifdef __AARCH64EB__
+	u32 unused2;
+	s32 syscallno;
+#else
+	s32 syscallno;
+	u32 unused2;
+#endif
+
+	u64 orig_addr_limit;
+	u64 unused;	// maintain 16 byte alignment
+	u64 stackframe[2];
+};
+
+static inline bool in_syscall(struct pt_regs const *regs)
+{
+	return regs->syscallno != NO_SYSCALL;
+}
+
+static inline void forget_syscall(struct pt_regs *regs)
+{
+	regs->syscallno = NO_SYSCALL;
+}
+
+#define MAX_REG_OFFSET offsetof(struct pt_regs, pstate)
+
+#define arch_has_single_step()	(1)
+
+#ifdef CONFIG_COMPAT
+#define compat_thumb_mode(regs) \
+	(((regs)->pstate & PSR_AA32_T_BIT))
+#else
+#define compat_thumb_mode(regs) (0)
+#endif
+
+#define user_mode(regs)	\
+	(((regs)->pstate & PSR_MODE_MASK) == PSR_MODE_EL0t)
+
+#define compat_user_mode(regs)	\
+	(((regs)->pstate & (PSR_MODE32_BIT | PSR_MODE_MASK)) == \
+	 (PSR_MODE32_BIT | PSR_MODE_EL0t))
+
+#define processor_mode(regs) \
+	((regs)->pstate & PSR_MODE_MASK)
+
+#define interrupts_enabled(regs) \
+	(!((regs)->pstate & PSR_I_BIT))
+
+#define fast_interrupts_enabled(regs) \
+	(!((regs)->pstate & PSR_F_BIT))
+
+#define GET_USP(regs) \
+	(!compat_user_mode(regs) ? (regs)->sp : (regs)->compat_sp)
+
+#define SET_USP(ptregs, value) \
+	(!compat_user_mode(regs) ? ((regs)->sp = value) : ((regs)->compat_sp = value))
+
+extern int regs_query_register_offset(const char *name);
+extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
+					       unsigned int n);
+
+/**
+ * regs_get_register() - get register value from its offset
+ * @regs:	pt_regs from which register value is gotten
+ * @offset:	offset 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 u64 regs_get_register(struct pt_regs *regs, unsigned int offset)
+{
+	u64 val = 0;
+
+	WARN_ON(offset & 7);
+
+	offset >>= 3;
+	switch (offset) {
+	case 0 ... 30:
+		val = regs->regs[offset];
+		break;
+	case offsetof(struct pt_regs, sp) >> 3:
+		val = regs->sp;
+		break;
+	case offsetof(struct pt_regs, pc) >> 3:
+		val = regs->pc;
+		break;
+	case offsetof(struct pt_regs, pstate) >> 3:
+		val = regs->pstate;
+		break;
+	default:
+		val = 0;
+	}
+
+	return val;
+}
+
+/*
+ * Read a register given an architectural register index r.
+ * This handles the common case where 31 means XZR, not SP.
+ */
+static inline unsigned long pt_regs_read_reg(const struct pt_regs *regs, int r)
+{
+	return (r == 31) ? 0 : regs->regs[r];
+}
+
+/*
+ * Write a register given an architectural register index r.
+ * This handles the common case where 31 means XZR, not SP.
+ */
+static inline void pt_regs_write_reg(struct pt_regs *regs, int r,
+				     unsigned long val)
+{
+	if (r != 31)
+		regs->regs[r] = val;
+}
+
+/* Valid only for Kernel mode traps. */
+static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
+{
+	return regs->sp;
+}
+
+static inline unsigned long regs_return_value(struct pt_regs *regs)
+{
+	return regs->regs[0];
+}
+
+/* We must avoid circular header include via sched.h */
+struct task_struct;
+int valid_user_regs(struct user_pt_regs *regs, struct task_struct *task);
+
+#define GET_IP(regs)		((unsigned long)(regs)->pc)
+#define SET_IP(regs, value)	((regs)->pc = ((u64) (value)))
+
+#define GET_FP(ptregs)		((unsigned long)(ptregs)->regs[29])
+#define SET_FP(ptregs, value)	((ptregs)->regs[29] = ((u64) (value)))
+
+#include <asm-generic/ptrace.h>
+
+#define procedure_link_pointer(regs)	((regs)->regs[30])
+
+static inline void procedure_link_pointer_set(struct pt_regs *regs,
+					   unsigned long val)
+{
+	procedure_link_pointer(regs) = val;
+}
+
+#undef profile_pc
+extern unsigned long profile_pc(struct pt_regs *regs);
+
+#endif /* __ASSEMBLY__ */
+#endif