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Diffstat (limited to 'arch/mips/kernel/ptrace.c')
-rw-r--r--arch/mips/kernel/ptrace.c244
1 files changed, 220 insertions, 24 deletions
diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c
index 0b571a5b4b83..f1b0f3e1f95b 100644
--- a/arch/mips/kernel/ptrace.c
+++ b/arch/mips/kernel/ptrace.c
@@ -28,14 +28,18 @@
#include <linux/security.h>
#include <linux/signal.h>
+#include <asm/byteorder.h>
#include <asm/cpu.h>
+#include <asm/dsp.h>
#include <asm/fpu.h>
#include <asm/mipsregs.h>
+#include <asm/mipsmtregs.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/bootinfo.h>
+#include <asm/reg.h>
/*
* Called by kernel/ptrace.c when detaching..
@@ -47,7 +51,130 @@ void ptrace_disable(struct task_struct *child)
/* Nothing to do.. */
}
-asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
+/*
+ * Read a general register set. We always use the 64-bit format, even
+ * for 32-bit kernels and for 32-bit processes on a 64-bit kernel.
+ * Registers are sign extended to fill the available space.
+ */
+int ptrace_getregs (struct task_struct *child, __s64 __user *data)
+{
+ struct pt_regs *regs;
+ int i;
+
+ if (!access_ok(VERIFY_WRITE, data, 38 * 8))
+ return -EIO;
+
+ regs = (struct pt_regs *) ((unsigned long) child->thread_info +
+ THREAD_SIZE - 32 - sizeof(struct pt_regs));
+
+ for (i = 0; i < 32; i++)
+ __put_user (regs->regs[i], data + i);
+ __put_user (regs->lo, data + EF_LO - EF_R0);
+ __put_user (regs->hi, data + EF_HI - EF_R0);
+ __put_user (regs->cp0_epc, data + EF_CP0_EPC - EF_R0);
+ __put_user (regs->cp0_badvaddr, data + EF_CP0_BADVADDR - EF_R0);
+ __put_user (regs->cp0_status, data + EF_CP0_STATUS - EF_R0);
+ __put_user (regs->cp0_cause, data + EF_CP0_CAUSE - EF_R0);
+
+ return 0;
+}
+
+/*
+ * Write a general register set. As for PTRACE_GETREGS, we always use
+ * the 64-bit format. On a 32-bit kernel only the lower order half
+ * (according to endianness) will be used.
+ */
+int ptrace_setregs (struct task_struct *child, __s64 __user *data)
+{
+ struct pt_regs *regs;
+ int i;
+
+ if (!access_ok(VERIFY_READ, data, 38 * 8))
+ return -EIO;
+
+ regs = (struct pt_regs *) ((unsigned long) child->thread_info +
+ THREAD_SIZE - 32 - sizeof(struct pt_regs));
+
+ for (i = 0; i < 32; i++)
+ __get_user (regs->regs[i], data + i);
+ __get_user (regs->lo, data + EF_LO - EF_R0);
+ __get_user (regs->hi, data + EF_HI - EF_R0);
+ __get_user (regs->cp0_epc, data + EF_CP0_EPC - EF_R0);
+
+ /* badvaddr, status, and cause may not be written. */
+
+ return 0;
+}
+
+int ptrace_getfpregs (struct task_struct *child, __u32 __user *data)
+{
+ int i;
+
+ if (!access_ok(VERIFY_WRITE, data, 33 * 8))
+ return -EIO;
+
+ if (tsk_used_math(child)) {
+ fpureg_t *fregs = get_fpu_regs(child);
+ for (i = 0; i < 32; i++)
+ __put_user (fregs[i], i + (__u64 __user *) data);
+ } else {
+ for (i = 0; i < 32; i++)
+ __put_user ((__u64) -1, i + (__u64 __user *) data);
+ }
+
+ if (cpu_has_fpu) {
+ unsigned int flags, tmp;
+
+ __put_user (child->thread.fpu.hard.fcr31, data + 64);
+
+ preempt_disable();
+ if (cpu_has_mipsmt) {
+ unsigned int vpflags = dvpe();
+ flags = read_c0_status();
+ __enable_fpu();
+ __asm__ __volatile__("cfc1\t%0,$0" : "=r" (tmp));
+ write_c0_status(flags);
+ evpe(vpflags);
+ } else {
+ flags = read_c0_status();
+ __enable_fpu();
+ __asm__ __volatile__("cfc1\t%0,$0" : "=r" (tmp));
+ write_c0_status(flags);
+ }
+ preempt_enable();
+ __put_user (tmp, data + 65);
+ } else {
+ __put_user (child->thread.fpu.soft.fcr31, data + 64);
+ __put_user ((__u32) 0, data + 65);
+ }
+
+ return 0;
+}
+
+int ptrace_setfpregs (struct task_struct *child, __u32 __user *data)
+{
+ fpureg_t *fregs;
+ int i;
+
+ if (!access_ok(VERIFY_READ, data, 33 * 8))
+ return -EIO;
+
+ fregs = get_fpu_regs(child);
+
+ for (i = 0; i < 32; i++)
+ __get_user (fregs[i], i + (__u64 __user *) data);
+
+ if (cpu_has_fpu)
+ __get_user (child->thread.fpu.hard.fcr31, data + 64);
+ else
+ __get_user (child->thread.fpu.soft.fcr31, data + 64);
+
+ /* FIR may not be written. */
+
+ return 0;
+}
+
+asmlinkage long sys_ptrace(long request, long pid, long addr, long data)
{
struct task_struct *child;
int ret;
@@ -103,7 +230,7 @@ asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
ret = -EIO;
if (copied != sizeof(tmp))
break;
- ret = put_user(tmp,(unsigned long *) data);
+ ret = put_user(tmp,(unsigned long __user *) data);
break;
}
@@ -169,18 +296,53 @@ asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
if (!cpu_has_fpu)
break;
- flags = read_c0_status();
- __enable_fpu();
- __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
- write_c0_status(flags);
+ preempt_disable();
+ if (cpu_has_mipsmt) {
+ unsigned int vpflags = dvpe();
+ flags = read_c0_status();
+ __enable_fpu();
+ __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
+ write_c0_status(flags);
+ evpe(vpflags);
+ } else {
+ flags = read_c0_status();
+ __enable_fpu();
+ __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
+ write_c0_status(flags);
+ }
+ preempt_enable();
+ break;
+ }
+ case DSP_BASE ... DSP_BASE + 5: {
+ dspreg_t *dregs;
+
+ if (!cpu_has_dsp) {
+ tmp = 0;
+ ret = -EIO;
+ goto out_tsk;
+ }
+ if (child->thread.dsp.used_dsp) {
+ dregs = __get_dsp_regs(child);
+ tmp = (unsigned long) (dregs[addr - DSP_BASE]);
+ } else {
+ tmp = -1; /* DSP registers yet used */
+ }
break;
}
+ case DSP_CONTROL:
+ if (!cpu_has_dsp) {
+ tmp = 0;
+ ret = -EIO;
+ goto out_tsk;
+ }
+ tmp = child->thread.dsp.dspcontrol;
+ break;
default:
tmp = 0;
ret = -EIO;
goto out_tsk;
}
- ret = put_user(tmp, (unsigned long *) data);
+ ret = put_user(tmp, (unsigned long __user *) data);
break;
}
@@ -247,6 +409,25 @@ asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
else
child->thread.fpu.soft.fcr31 = data;
break;
+ case DSP_BASE ... DSP_BASE + 5: {
+ dspreg_t *dregs;
+
+ if (!cpu_has_dsp) {
+ ret = -EIO;
+ break;
+ }
+
+ dregs = __get_dsp_regs(child);
+ dregs[addr - DSP_BASE] = data;
+ break;
+ }
+ case DSP_CONTROL:
+ if (!cpu_has_dsp) {
+ ret = -EIO;
+ break;
+ }
+ child->thread.dsp.dspcontrol = data;
+ break;
default:
/* The rest are not allowed. */
ret = -EIO;
@@ -255,6 +436,22 @@ asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
break;
}
+ case PTRACE_GETREGS:
+ ret = ptrace_getregs (child, (__u64 __user *) data);
+ break;
+
+ case PTRACE_SETREGS:
+ ret = ptrace_setregs (child, (__u64 __user *) data);
+ break;
+
+ case PTRACE_GETFPREGS:
+ ret = ptrace_getfpregs (child, (__u32 __user *) data);
+ break;
+
+ case PTRACE_SETFPREGS:
+ ret = ptrace_setfpregs (child, (__u32 __user *) data);
+ break;
+
case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
case PTRACE_CONT: { /* restart after signal. */
ret = -EIO;
@@ -289,6 +486,11 @@ asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
ret = ptrace_detach(child, data);
break;
+ case PTRACE_GET_THREAD_AREA:
+ ret = put_user(child->thread_info->tp_value,
+ (unsigned long __user *) data);
+ break;
+
default:
ret = ptrace_request(child, request, addr, data);
break;
@@ -303,21 +505,14 @@ out:
static inline int audit_arch(void)
{
-#ifdef CONFIG_CPU_LITTLE_ENDIAN
-#ifdef CONFIG_64BIT
- if (!(current->thread.mflags & MF_32BIT_REGS))
- return AUDIT_ARCH_MIPSEL64;
-#endif /* MIPS64 */
- return AUDIT_ARCH_MIPSEL;
-
-#else /* big endian... */
+ int arch = EM_MIPS;
#ifdef CONFIG_64BIT
- if (!(current->thread.mflags & MF_32BIT_REGS))
- return AUDIT_ARCH_MIPS64;
-#endif /* MIPS64 */
- return AUDIT_ARCH_MIPS;
-
-#endif /* endian */
+ arch |= __AUDIT_ARCH_64BIT;
+#endif
+#if defined(__LITTLE_ENDIAN)
+ arch |= __AUDIT_ARCH_LE;
+#endif
+ return arch;
}
/*
@@ -327,12 +522,13 @@ static inline int audit_arch(void)
asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
{
if (unlikely(current->audit_context) && entryexit)
- audit_syscall_exit(current, AUDITSC_RESULT(regs->regs[2]), regs->regs[2]);
+ audit_syscall_exit(current, AUDITSC_RESULT(regs->regs[2]),
+ regs->regs[2]);
- if (!test_thread_flag(TIF_SYSCALL_TRACE))
- goto out;
if (!(current->ptrace & PT_PTRACED))
goto out;
+ if (!test_thread_flag(TIF_SYSCALL_TRACE))
+ goto out;
/* The 0x80 provides a way for the tracing parent to distinguish
between a syscall stop and SIGTRAP delivery */
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.