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-rw-r--r--arch/metag/include/asm/ptrace.h60
-rw-r--r--arch/metag/include/uapi/asm/ptrace.h113
-rw-r--r--arch/metag/kernel/ptrace.c380
-rw-r--r--include/uapi/linux/elf.h2
4 files changed, 555 insertions, 0 deletions
diff --git a/arch/metag/include/asm/ptrace.h b/arch/metag/include/asm/ptrace.h
new file mode 100644
index 00000000000..fcabc18daf2
--- /dev/null
+++ b/arch/metag/include/asm/ptrace.h
@@ -0,0 +1,60 @@
+#ifndef _METAG_PTRACE_H
+#define _METAG_PTRACE_H
+
+#include <linux/compiler.h>
+#include <uapi/asm/ptrace.h>
+#include <asm/tbx.h>
+
+#ifndef __ASSEMBLY__
+
+/* this struct defines the way the registers are stored on the
+ stack during a system call. */
+
+struct pt_regs {
+ TBICTX ctx;
+ TBICTXEXTCB0 extcb0[5];
+};
+
+#define user_mode(regs) (((regs)->ctx.SaveMask & TBICTX_PRIV_BIT) > 0)
+
+#define instruction_pointer(regs) ((unsigned long)(regs)->ctx.CurrPC)
+#define profile_pc(regs) instruction_pointer(regs)
+
+#define task_pt_regs(task) \
+ ((struct pt_regs *)(task_stack_page(task) + \
+ sizeof(struct thread_info)))
+
+#define current_pt_regs() \
+ ((struct pt_regs *)((char *)current_thread_info() + \
+ sizeof(struct thread_info)))
+
+int syscall_trace_enter(struct pt_regs *regs);
+void syscall_trace_leave(struct pt_regs *regs);
+
+/* copy a struct user_gp_regs out to user */
+int metag_gp_regs_copyout(const struct pt_regs *regs,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf);
+/* copy a struct user_gp_regs in from user */
+int metag_gp_regs_copyin(struct pt_regs *regs,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf);
+/* copy a struct user_cb_regs out to user */
+int metag_cb_regs_copyout(const struct pt_regs *regs,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf);
+/* copy a struct user_cb_regs in from user */
+int metag_cb_regs_copyin(struct pt_regs *regs,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf);
+/* copy a struct user_rp_state out to user */
+int metag_rp_state_copyout(const struct pt_regs *regs,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf);
+/* copy a struct user_rp_state in from user */
+int metag_rp_state_copyin(struct pt_regs *regs,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf);
+
+#endif /* __ASSEMBLY__ */
+#endif /* _METAG_PTRACE_H */
diff --git a/arch/metag/include/uapi/asm/ptrace.h b/arch/metag/include/uapi/asm/ptrace.h
new file mode 100644
index 00000000000..45d97809d33
--- /dev/null
+++ b/arch/metag/include/uapi/asm/ptrace.h
@@ -0,0 +1,113 @@
+#ifndef _UAPI_METAG_PTRACE_H
+#define _UAPI_METAG_PTRACE_H
+
+#ifndef __ASSEMBLY__
+
+/*
+ * These are the layouts of the regsets returned by the GETREGSET ptrace call
+ */
+
+/* user_gp_regs::status */
+
+/* CBMarker bit (indicates catch state / catch replay) */
+#define USER_GP_REGS_STATUS_CATCH_BIT (1 << 22)
+#define USER_GP_REGS_STATUS_CATCH_S 22
+/* LSM_STEP field (load/store multiple step) */
+#define USER_GP_REGS_STATUS_LSM_STEP_BITS (0x7 << 8)
+#define USER_GP_REGS_STATUS_LSM_STEP_S 8
+/* SCC bit (indicates split 16x16 condition flags) */
+#define USER_GP_REGS_STATUS_SCC_BIT (1 << 4)
+#define USER_GP_REGS_STATUS_SCC_S 4
+
+/* normal condition flags */
+/* CF_Z bit (Zero flag) */
+#define USER_GP_REGS_STATUS_CF_Z_BIT (1 << 3)
+#define USER_GP_REGS_STATUS_CF_Z_S 3
+/* CF_N bit (Negative flag) */
+#define USER_GP_REGS_STATUS_CF_N_BIT (1 << 2)
+#define USER_GP_REGS_STATUS_CF_N_S 2
+/* CF_V bit (oVerflow flag) */
+#define USER_GP_REGS_STATUS_CF_V_BIT (1 << 1)
+#define USER_GP_REGS_STATUS_CF_V_S 1
+/* CF_C bit (Carry flag) */
+#define USER_GP_REGS_STATUS_CF_C_BIT (1 << 0)
+#define USER_GP_REGS_STATUS_CF_C_S 0
+
+/* split 16x16 condition flags */
+/* SCF_LZ bit (Low Zero flag) */
+#define USER_GP_REGS_STATUS_SCF_LZ_BIT (1 << 3)
+#define USER_GP_REGS_STATUS_SCF_LZ_S 3
+/* SCF_HZ bit (High Zero flag) */
+#define USER_GP_REGS_STATUS_SCF_HZ_BIT (1 << 2)
+#define USER_GP_REGS_STATUS_SCF_HZ_S 2
+/* SCF_HC bit (High Carry flag) */
+#define USER_GP_REGS_STATUS_SCF_HC_BIT (1 << 1)
+#define USER_GP_REGS_STATUS_SCF_HC_S 1
+/* SCF_LC bit (Low Carry flag) */
+#define USER_GP_REGS_STATUS_SCF_LC_BIT (1 << 0)
+#define USER_GP_REGS_STATUS_SCF_LC_S 0
+
+/**
+ * struct user_gp_regs - User general purpose registers
+ * @dx: GP data unit regs (dx[reg][unit] = D{unit:0-1}.{reg:0-7})
+ * @ax: GP address unit regs (ax[reg][unit] = A{unit:0-1}.{reg:0-3})
+ * @pc: PC register
+ * @status: TXSTATUS register (condition flags, LSM_STEP etc)
+ * @rpt: TXRPT registers (branch repeat counter)
+ * @bpobits: TXBPOBITS register ("branch prediction other" bits)
+ * @mode: TXMODE register
+ * @_pad1: Reserved padding to make sizeof obviously 64bit aligned
+ *
+ * This is the user-visible general purpose register state structure.
+ *
+ * It can be accessed through PTRACE_GETREGSET with NT_PRSTATUS.
+ *
+ * It is also used in the signal context.
+ */
+struct user_gp_regs {
+ unsigned long dx[8][2];
+ unsigned long ax[4][2];
+ unsigned long pc;
+ unsigned long status;
+ unsigned long rpt;
+ unsigned long bpobits;
+ unsigned long mode;
+ unsigned long _pad1;
+};
+
+/**
+ * struct user_cb_regs - User catch buffer registers
+ * @flags: TXCATCH0 register (fault flags)
+ * @addr: TXCATCH1 register (fault address)
+ * @data: TXCATCH2 and TXCATCH3 registers (low and high data word)
+ *
+ * This is the user-visible catch buffer register state structure containing
+ * information about a failed memory access, and allowing the access to be
+ * modified and replayed.
+ *
+ * It can be accessed through PTRACE_GETREGSET with NT_METAG_CBUF.
+ */
+struct user_cb_regs {
+ unsigned long flags;
+ unsigned long addr;
+ unsigned long long data;
+};
+
+/**
+ * struct user_rp_state - User read pipeline state
+ * @entries: Read pipeline entries
+ * @mask: Mask of valid pipeline entries (RPMask from TXDIVTIME register)
+ *
+ * This is the user-visible read pipeline state structure containing the entries
+ * currently in the read pipeline and the mask of valid entries.
+ *
+ * It can be accessed through PTRACE_GETREGSET with NT_METAG_RPIPE.
+ */
+struct user_rp_state {
+ unsigned long long entries[6];
+ unsigned long mask;
+};
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _UAPI_METAG_PTRACE_H */
diff --git a/arch/metag/kernel/ptrace.c b/arch/metag/kernel/ptrace.c
new file mode 100644
index 00000000000..47a8828615a
--- /dev/null
+++ b/arch/metag/kernel/ptrace.c
@@ -0,0 +1,380 @@
+/*
+ * Copyright (C) 2005-2012 Imagination Technologies Ltd.
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/errno.h>
+#include <linux/ptrace.h>
+#include <linux/user.h>
+#include <linux/regset.h>
+#include <linux/tracehook.h>
+#include <linux/elf.h>
+#include <linux/uaccess.h>
+#include <trace/syscall.h>
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/syscalls.h>
+
+/*
+ * user_regset definitions.
+ */
+
+int metag_gp_regs_copyout(const struct pt_regs *regs,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ const void *ptr;
+ unsigned long data;
+ int ret;
+
+ /* D{0-1}.{0-7} */
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ regs->ctx.DX, 0, 4*16);
+ if (ret)
+ goto out;
+ /* A{0-1}.{0-1} */
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ regs->ctx.AX, 4*16, 4*20);
+ if (ret)
+ goto out;
+ /* A{0-1}.2 */
+ if (regs->ctx.SaveMask & TBICTX_XEXT_BIT)
+ ptr = regs->ctx.Ext.Ctx.pExt;
+ else
+ ptr = &regs->ctx.Ext.AX2;
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ ptr, 4*20, 4*22);
+ if (ret)
+ goto out;
+ /* A{0-1}.3 */
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &regs->ctx.AX3, 4*22, 4*24);
+ if (ret)
+ goto out;
+ /* PC */
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &regs->ctx.CurrPC, 4*24, 4*25);
+ if (ret)
+ goto out;
+ /* TXSTATUS */
+ data = (unsigned long)regs->ctx.Flags;
+ if (regs->ctx.SaveMask & TBICTX_CBUF_BIT)
+ data |= USER_GP_REGS_STATUS_CATCH_BIT;
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &data, 4*25, 4*26);
+ if (ret)
+ goto out;
+ /* TXRPT, TXBPOBITS, TXMODE */
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &regs->ctx.CurrRPT, 4*26, 4*29);
+ if (ret)
+ goto out;
+ /* Padding */
+ ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+ 4*29, 4*30);
+out:
+ return ret;
+}
+
+int metag_gp_regs_copyin(struct pt_regs *regs,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ void *ptr;
+ unsigned long data;
+ int ret;
+
+ /* D{0-1}.{0-7} */
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ regs->ctx.DX, 0, 4*16);
+ if (ret)
+ goto out;
+ /* A{0-1}.{0-1} */
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ regs->ctx.AX, 4*16, 4*20);
+ if (ret)
+ goto out;
+ /* A{0-1}.2 */
+ if (regs->ctx.SaveMask & TBICTX_XEXT_BIT)
+ ptr = regs->ctx.Ext.Ctx.pExt;
+ else
+ ptr = &regs->ctx.Ext.AX2;
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ ptr, 4*20, 4*22);
+ if (ret)
+ goto out;
+ /* A{0-1}.3 */
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &regs->ctx.AX3, 4*22, 4*24);
+ if (ret)
+ goto out;
+ /* PC */
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &regs->ctx.CurrPC, 4*24, 4*25);
+ if (ret)
+ goto out;
+ /* TXSTATUS */
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &data, 4*25, 4*26);
+ if (ret)
+ goto out;
+ regs->ctx.Flags = data & 0xffff;
+ if (data & USER_GP_REGS_STATUS_CATCH_BIT)
+ regs->ctx.SaveMask |= TBICTX_XCBF_BIT | TBICTX_CBUF_BIT;
+ else
+ regs->ctx.SaveMask &= ~TBICTX_CBUF_BIT;
+ /* TXRPT, TXBPOBITS, TXMODE */
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &regs->ctx.CurrRPT, 4*26, 4*29);
+out:
+ return ret;
+}
+
+static int metag_gp_regs_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ const struct pt_regs *regs = task_pt_regs(target);
+ return metag_gp_regs_copyout(regs, pos, count, kbuf, ubuf);
+}
+
+static int metag_gp_regs_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ struct pt_regs *regs = task_pt_regs(target);
+ return metag_gp_regs_copyin(regs, pos, count, kbuf, ubuf);
+}
+
+int metag_cb_regs_copyout(const struct pt_regs *regs,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ int ret;
+
+ /* TXCATCH{0-3} */
+ if (regs->ctx.SaveMask & TBICTX_XCBF_BIT)
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ regs->extcb0, 0, 4*4);
+ else
+ ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+ 0, 4*4);
+ return ret;
+}
+
+int metag_cb_regs_copyin(struct pt_regs *regs,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ int ret;
+
+ /* TXCATCH{0-3} */
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ regs->extcb0, 0, 4*4);
+ return ret;
+}
+
+static int metag_cb_regs_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ const struct pt_regs *regs = task_pt_regs(target);
+ return metag_cb_regs_copyout(regs, pos, count, kbuf, ubuf);
+}
+
+static int metag_cb_regs_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ struct pt_regs *regs = task_pt_regs(target);
+ return metag_cb_regs_copyin(regs, pos, count, kbuf, ubuf);
+}
+
+int metag_rp_state_copyout(const struct pt_regs *regs,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ unsigned long mask;
+ u64 *ptr;
+ int ret, i;
+
+ /* Empty read pipeline */
+ if (!(regs->ctx.SaveMask & TBICTX_CBRP_BIT)) {
+ ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+ 0, 4*13);
+ goto out;
+ }
+
+ mask = (regs->ctx.CurrDIVTIME & TXDIVTIME_RPMASK_BITS) >>
+ TXDIVTIME_RPMASK_S;
+
+ /* Read pipeline entries */
+ ptr = (void *)&regs->extcb0[1];
+ for (i = 0; i < 6; ++i, ++ptr) {
+ if (mask & (1 << i))
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ ptr, 8*i, 8*(i + 1));
+ else
+ ret = user_regset_copyout_zero(&pos, &count, &kbuf,
+ &ubuf, 8*i, 8*(i + 1));
+ if (ret)
+ goto out;
+ }
+ /* Mask of entries */
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &mask, 4*12, 4*13);
+out:
+ return ret;
+}
+
+int metag_rp_state_copyin(struct pt_regs *regs,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ struct user_rp_state rp;
+ unsigned long long *ptr;
+ int ret, i;
+
+ /* Read the entire pipeline before making any changes */
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &rp, 0, 4*13);
+ if (ret)
+ goto out;
+
+ /* Write pipeline entries */
+ ptr = (void *)&regs->extcb0[1];
+ for (i = 0; i < 6; ++i, ++ptr)
+ if (rp.mask & (1 << i))
+ *ptr = rp.entries[i];
+
+ /* Update RPMask in TXDIVTIME */
+ regs->ctx.CurrDIVTIME &= ~TXDIVTIME_RPMASK_BITS;
+ regs->ctx.CurrDIVTIME |= (rp.mask << TXDIVTIME_RPMASK_S)
+ & TXDIVTIME_RPMASK_BITS;
+
+ /* Set/clear flags to indicate catch/read pipeline state */
+ if (rp.mask)
+ regs->ctx.SaveMask |= TBICTX_XCBF_BIT | TBICTX_CBRP_BIT;
+ else
+ regs->ctx.SaveMask &= ~TBICTX_CBRP_BIT;
+out:
+ return ret;
+}
+
+static int metag_rp_state_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ const struct pt_regs *regs = task_pt_regs(target);
+ return metag_rp_state_copyout(regs, pos, count, kbuf, ubuf);
+}
+
+static int metag_rp_state_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ struct pt_regs *regs = task_pt_regs(target);
+ return metag_rp_state_copyin(regs, pos, count, kbuf, ubuf);
+}
+
+enum metag_regset {
+ REGSET_GENERAL,
+ REGSET_CBUF,
+ REGSET_READPIPE,
+};
+
+static const struct user_regset metag_regsets[] = {
+ [REGSET_GENERAL] = {
+ .core_note_type = NT_PRSTATUS,
+ .n = ELF_NGREG,
+ .size = sizeof(long),
+ .align = sizeof(long long),
+ .get = metag_gp_regs_get,
+ .set = metag_gp_regs_set,
+ },
+ [REGSET_CBUF] = {
+ .core_note_type = NT_METAG_CBUF,
+ .n = sizeof(struct user_cb_regs) / sizeof(long),
+ .size = sizeof(long),
+ .align = sizeof(long long),
+ .get = metag_cb_regs_get,
+ .set = metag_cb_regs_set,
+ },
+ [REGSET_READPIPE] = {
+ .core_note_type = NT_METAG_RPIPE,
+ .n = sizeof(struct user_rp_state) / sizeof(long),
+ .size = sizeof(long),
+ .align = sizeof(long long),
+ .get = metag_rp_state_get,
+ .set = metag_rp_state_set,
+ },
+};
+
+static const struct user_regset_view user_metag_view = {
+ .name = "metag",
+ .e_machine = EM_METAG,
+ .regsets = metag_regsets,
+ .n = ARRAY_SIZE(metag_regsets)
+};
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *task)
+{
+ return &user_metag_view;
+}
+
+/*
+ * Called by kernel/ptrace.c when detaching..
+ *
+ * Make sure single step bits etc are not set.
+ */
+void ptrace_disable(struct task_struct *child)
+{
+ /* nothing to do.. */
+}
+
+long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
+ unsigned long data)
+{
+ int ret;
+
+ switch (request) {
+ default:
+ ret = ptrace_request(child, request, addr, data);
+ break;
+ }
+
+ return ret;
+}
+
+int syscall_trace_enter(struct pt_regs *regs)
+{
+ int ret = 0;
+
+ if (test_thread_flag(TIF_SYSCALL_TRACE))
+ ret = tracehook_report_syscall_entry(regs);
+
+ if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
+ trace_sys_enter(regs, regs->ctx.DX[0].U1);
+
+ return ret ? -1 : regs->ctx.DX[0].U1;
+}
+
+void syscall_trace_leave(struct pt_regs *regs)
+{
+ if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
+ trace_sys_exit(regs, regs->ctx.DX[0].U1);
+
+ if (test_thread_flag(TIF_SYSCALL_TRACE))
+ tracehook_report_syscall_exit(regs, 0);
+}
diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h
index 126a8175e3e..eb164a298b9 100644
--- a/include/uapi/linux/elf.h
+++ b/include/uapi/linux/elf.h
@@ -395,6 +395,8 @@ typedef struct elf64_shdr {
#define NT_ARM_TLS 0x401 /* ARM TLS register */
#define NT_ARM_HW_BREAK 0x402 /* ARM hardware breakpoint registers */
#define NT_ARM_HW_WATCH 0x403 /* ARM hardware watchpoint registers */
+#define NT_METAG_CBUF 0x500 /* Metag catch buffer registers */
+#define NT_METAG_RPIPE 0x501 /* Metag read pipeline state */
/* Note header in a PT_NOTE section */
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-04 23:07:49 +0000