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-rw-r--r--arch/xtensa/kernel/ptrace.c354
1 files changed, 354 insertions, 0 deletions
diff --git a/arch/xtensa/kernel/ptrace.c b/arch/xtensa/kernel/ptrace.c
new file mode 100644
index 000000000..4d54b4811
--- /dev/null
+++ b/arch/xtensa/kernel/ptrace.c
@@ -0,0 +1,354 @@
+// TODO some minor issues
+/*
+ * 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.
+ *
+ * Copyright (C) 2001 - 2007 Tensilica Inc.
+ *
+ * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
+ * Chris Zankel <chris@zankel.net>
+ * Scott Foehner<sfoehner@yahoo.com>,
+ * Kevin Chea
+ * Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
+ */
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/errno.h>
+#include <linux/ptrace.h>
+#include <linux/smp.h>
+#include <linux/security.h>
+#include <linux/signal.h>
+
+#include <asm/pgtable.h>
+#include <asm/page.h>
+#include <asm/uaccess.h>
+#include <asm/ptrace.h>
+#include <asm/elf.h>
+#include <asm/coprocessor.h>
+
+
+void user_enable_single_step(struct task_struct *child)
+{
+ child->ptrace |= PT_SINGLESTEP;
+}
+
+void user_disable_single_step(struct task_struct *child)
+{
+ child->ptrace &= ~PT_SINGLESTEP;
+}
+
+/*
+ * Called by kernel/ptrace.c when detaching to disable single stepping.
+ */
+
+void ptrace_disable(struct task_struct *child)
+{
+ /* Nothing to do.. */
+}
+
+int ptrace_getregs(struct task_struct *child, void __user *uregs)
+{
+ struct pt_regs *regs = task_pt_regs(child);
+ xtensa_gregset_t __user *gregset = uregs;
+ unsigned long wb = regs->windowbase;
+ int i;
+
+ if (!access_ok(VERIFY_WRITE, uregs, sizeof(xtensa_gregset_t)))
+ return -EIO;
+
+ __put_user(regs->pc, &gregset->pc);
+ __put_user(regs->ps & ~(1 << PS_EXCM_BIT), &gregset->ps);
+ __put_user(regs->lbeg, &gregset->lbeg);
+ __put_user(regs->lend, &gregset->lend);
+ __put_user(regs->lcount, &gregset->lcount);
+ __put_user(regs->windowstart, &gregset->windowstart);
+ __put_user(regs->windowbase, &gregset->windowbase);
+ __put_user(regs->threadptr, &gregset->threadptr);
+
+ for (i = 0; i < XCHAL_NUM_AREGS; i++)
+ __put_user(regs->areg[i],
+ gregset->a + ((wb * 4 + i) % XCHAL_NUM_AREGS));
+
+ return 0;
+}
+
+int ptrace_setregs(struct task_struct *child, void __user *uregs)
+{
+ struct pt_regs *regs = task_pt_regs(child);
+ xtensa_gregset_t *gregset = uregs;
+ const unsigned long ps_mask = PS_CALLINC_MASK | PS_OWB_MASK;
+ unsigned long ps;
+ unsigned long wb, ws;
+
+ if (!access_ok(VERIFY_WRITE, uregs, sizeof(xtensa_gregset_t)))
+ return -EIO;
+
+ __get_user(regs->pc, &gregset->pc);
+ __get_user(ps, &gregset->ps);
+ __get_user(regs->lbeg, &gregset->lbeg);
+ __get_user(regs->lend, &gregset->lend);
+ __get_user(regs->lcount, &gregset->lcount);
+ __get_user(ws, &gregset->windowstart);
+ __get_user(wb, &gregset->windowbase);
+ __get_user(regs->threadptr, &gregset->threadptr);
+
+ regs->ps = (regs->ps & ~ps_mask) | (ps & ps_mask) | (1 << PS_EXCM_BIT);
+
+ if (wb >= XCHAL_NUM_AREGS / 4)
+ return -EFAULT;
+
+ if (wb != regs->windowbase || ws != regs->windowstart) {
+ unsigned long rotws, wmask;
+
+ rotws = (((ws | (ws << WSBITS)) >> wb) &
+ ((1 << WSBITS) - 1)) & ~1;
+ wmask = ((rotws ? WSBITS + 1 - ffs(rotws) : 0) << 4) |
+ (rotws & 0xF) | 1;
+ regs->windowbase = wb;
+ regs->windowstart = ws;
+ regs->wmask = wmask;
+ }
+
+ if (wb != 0 && __copy_from_user(regs->areg + XCHAL_NUM_AREGS - wb * 4,
+ gregset->a, wb * 16))
+ return -EFAULT;
+
+ if (__copy_from_user(regs->areg, gregset->a + wb * 4,
+ (WSBITS - wb) * 16))
+ return -EFAULT;
+
+ return 0;
+}
+
+
+int ptrace_getxregs(struct task_struct *child, void __user *uregs)
+{
+ struct pt_regs *regs = task_pt_regs(child);
+ struct thread_info *ti = task_thread_info(child);
+ elf_xtregs_t __user *xtregs = uregs;
+ int ret = 0;
+
+ if (!access_ok(VERIFY_WRITE, uregs, sizeof(elf_xtregs_t)))
+ return -EIO;
+
+#if XTENSA_HAVE_COPROCESSORS
+ /* Flush all coprocessor registers to memory. */
+ coprocessor_flush_all(ti);
+ ret |= __copy_to_user(&xtregs->cp0, &ti->xtregs_cp,
+ sizeof(xtregs_coprocessor_t));
+#endif
+ ret |= __copy_to_user(&xtregs->opt, &regs->xtregs_opt,
+ sizeof(xtregs->opt));
+ ret |= __copy_to_user(&xtregs->user,&ti->xtregs_user,
+ sizeof(xtregs->user));
+
+ return ret ? -EFAULT : 0;
+}
+
+int ptrace_setxregs(struct task_struct *child, void __user *uregs)
+{
+ struct thread_info *ti = task_thread_info(child);
+ struct pt_regs *regs = task_pt_regs(child);
+ elf_xtregs_t *xtregs = uregs;
+ int ret = 0;
+
+ if (!access_ok(VERIFY_READ, uregs, sizeof(elf_xtregs_t)))
+ return -EFAULT;
+
+#if XTENSA_HAVE_COPROCESSORS
+ /* Flush all coprocessors before we overwrite them. */
+ coprocessor_flush_all(ti);
+ coprocessor_release_all(ti);
+
+ ret |= __copy_from_user(&ti->xtregs_cp, &xtregs->cp0,
+ sizeof(xtregs_coprocessor_t));
+#endif
+ ret |= __copy_from_user(&regs->xtregs_opt, &xtregs->opt,
+ sizeof(xtregs->opt));
+ ret |= __copy_from_user(&ti->xtregs_user, &xtregs->user,
+ sizeof(xtregs->user));
+
+ return ret ? -EFAULT : 0;
+}
+
+int ptrace_peekusr(struct task_struct *child, long regno, long __user *ret)
+{
+ struct pt_regs *regs;
+ unsigned long tmp;
+
+ regs = task_pt_regs(child);
+ tmp = 0; /* Default return value. */
+
+ switch(regno) {
+
+ case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1:
+ tmp = regs->areg[regno - REG_AR_BASE];
+ break;
+
+ case REG_A_BASE ... REG_A_BASE + 15:
+ tmp = regs->areg[regno - REG_A_BASE];
+ break;
+
+ case REG_PC:
+ tmp = regs->pc;
+ break;
+
+ case REG_PS:
+ /* Note: PS.EXCM is not set while user task is running;
+ * its being set in regs is for exception handling
+ * convenience. */
+ tmp = (regs->ps & ~(1 << PS_EXCM_BIT));
+ break;
+
+ case REG_WB:
+ break; /* tmp = 0 */
+
+ case REG_WS:
+ {
+ unsigned long wb = regs->windowbase;
+ unsigned long ws = regs->windowstart;
+ tmp = ((ws>>wb) | (ws<<(WSBITS-wb))) & ((1<<WSBITS)-1);
+ break;
+ }
+ case REG_LBEG:
+ tmp = regs->lbeg;
+ break;
+
+ case REG_LEND:
+ tmp = regs->lend;
+ break;
+
+ case REG_LCOUNT:
+ tmp = regs->lcount;
+ break;
+
+ case REG_SAR:
+ tmp = regs->sar;
+ break;
+
+ case SYSCALL_NR:
+ tmp = regs->syscall;
+ break;
+
+ default:
+ return -EIO;
+ }
+ return put_user(tmp, ret);
+}
+
+int ptrace_pokeusr(struct task_struct *child, long regno, long val)
+{
+ struct pt_regs *regs;
+ regs = task_pt_regs(child);
+
+ switch (regno) {
+ case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1:
+ regs->areg[regno - REG_AR_BASE] = val;
+ break;
+
+ case REG_A_BASE ... REG_A_BASE + 15:
+ regs->areg[regno - REG_A_BASE] = val;
+ break;
+
+ case REG_PC:
+ regs->pc = val;
+ break;
+
+ case SYSCALL_NR:
+ regs->syscall = val;
+ break;
+
+ default:
+ return -EIO;
+ }
+ return 0;
+}
+
+long arch_ptrace(struct task_struct *child, long request,
+ unsigned long addr, unsigned long data)
+{
+ int ret = -EPERM;
+ void __user *datap = (void __user *) data;
+
+ switch (request) {
+ case PTRACE_PEEKTEXT: /* read word at location addr. */
+ case PTRACE_PEEKDATA:
+ ret = generic_ptrace_peekdata(child, addr, data);
+ break;
+
+ case PTRACE_PEEKUSR: /* read register specified by addr. */
+ ret = ptrace_peekusr(child, addr, datap);
+ break;
+
+ case PTRACE_POKETEXT: /* write the word at location addr. */
+ case PTRACE_POKEDATA:
+ ret = generic_ptrace_pokedata(child, addr, data);
+ break;
+
+ case PTRACE_POKEUSR: /* write register specified by addr. */
+ ret = ptrace_pokeusr(child, addr, data);
+ break;
+
+ case PTRACE_GETREGS:
+ ret = ptrace_getregs(child, datap);
+ break;
+
+ case PTRACE_SETREGS:
+ ret = ptrace_setregs(child, datap);
+ break;
+
+ case PTRACE_GETXTREGS:
+ ret = ptrace_getxregs(child, datap);
+ break;
+
+ case PTRACE_SETXTREGS:
+ ret = ptrace_setxregs(child, datap);
+ break;
+
+ default:
+ ret = ptrace_request(child, request, addr, data);
+ break;
+ }
+
+ return ret;
+}
+
+void do_syscall_trace(void)
+{
+ /*
+ * The 0x80 provides a way for the tracing parent to distinguish
+ * between a syscall stop and SIGTRAP delivery
+ */
+ ptrace_notify(SIGTRAP|((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0));
+
+ /*
+ * this isn't the same as continuing with a signal, but it will do
+ * for normal use. strace only continues with a signal if the
+ * stopping signal is not SIGTRAP. -brl
+ */
+ if (current->exit_code) {
+ send_sig(current->exit_code, current, 1);
+ current->exit_code = 0;
+ }
+}
+
+void do_syscall_trace_enter(struct pt_regs *regs)
+{
+ if (test_thread_flag(TIF_SYSCALL_TRACE)
+ && (current->ptrace & PT_PTRACED))
+ do_syscall_trace();
+
+#if 0
+ audit_syscall_entry(...);
+#endif
+}
+
+void do_syscall_trace_leave(struct pt_regs *regs)
+{
+ if ((test_thread_flag(TIF_SYSCALL_TRACE))
+ && (current->ptrace & PT_PTRACED))
+ do_syscall_trace();
+}