Revise MIPS 64-bit ptrace interface
Change the N32 debugging ABI to something more sane, and add support
for o32 and n32 debuggers to trace n64 programs.
Signed-off-by: Daniel Jacobowitz <dan@codesourcery.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c
index 7428336..122433f 100644
--- a/arch/mips/kernel/ptrace.c
+++ b/arch/mips/kernel/ptrace.c
@@ -38,6 +38,7 @@
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/bootinfo.h>
+#include <asm/reg.h>
/*
* Called by kernel/ptrace.c when detaching..
@@ -49,6 +50,118 @@
/* Nothing to do.. */
}
+/*
+ * 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);
+
+ flags = read_c0_status();
+ __enable_fpu();
+ __asm__ __volatile__("cfc1\t%0,$0" : "=r" (tmp));
+ write_c0_status(flags);
+ __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 int sys_ptrace(long request, long pid, long addr, long data)
{
struct task_struct *child;
@@ -300,6 +413,22 @@
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;