MIPS: Add and use watch register field definitions

The files watch.c and ptrace.c contain various magic masks for
WatchLo/WatchHi register fields. Add some definitions to mipsregs.h for
these registers and make use of them in both watch.c and ptrace.c,
hopefully making them more readable.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Reviewed-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/12729/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/include/asm/mipsregs.h b/arch/mips/include/asm/mipsregs.h
index c08b6f798f8f6bc7b3015a33c751ae38c41ca3db..aea90631a301218ba3c19510aaa2483645c71abc 100644 (file)
--- a/arch/mips/include/asm/mipsregs.h
+++ b/arch/mips/include/asm/mipsregs.h
@@ -648,6 +648,24 @@
 /* FTLB probability bits for R6 */
 #define MIPS_CONF7_FTLBP_SHIFT (18)
 
+/* WatchLo* register definitions */
+#define MIPS_WATCHLO_IRW       (_ULCAST_(0x7) << 0)
+
+/* WatchHi* register definitions */
+#define MIPS_WATCHHI_M         (_ULCAST_(1) << 31)
+#define MIPS_WATCHHI_G         (_ULCAST_(1) << 30)
+#define MIPS_WATCHHI_WM                (_ULCAST_(0x3) << 28)
+#define MIPS_WATCHHI_WM_R_RVA  (_ULCAST_(0) << 28)
+#define MIPS_WATCHHI_WM_R_GPA  (_ULCAST_(1) << 28)
+#define MIPS_WATCHHI_WM_G_GVA  (_ULCAST_(2) << 28)
+#define MIPS_WATCHHI_EAS       (_ULCAST_(0x3) << 24)
+#define MIPS_WATCHHI_ASID      (_ULCAST_(0xff) << 16)
+#define MIPS_WATCHHI_MASK      (_ULCAST_(0x1ff) << 3)
+#define MIPS_WATCHHI_I         (_ULCAST_(1) << 2)
+#define MIPS_WATCHHI_R         (_ULCAST_(1) << 1)
+#define MIPS_WATCHHI_W         (_ULCAST_(1) << 0)
+#define MIPS_WATCHHI_IRW       (_ULCAST_(0x7) << 0)
+
 /* MAAR bit definitions */
 #define MIPS_MAAR_ADDR         ((BIT_ULL(BITS_PER_LONG - 12) - 1) << 12)
 #define MIPS_MAAR_ADDR_SHIFT   12

diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c
index a5279b2f31989f8c8dcd915fccb233a4ada33332..48c0534c4d15a0128ee1fa1f9580e218a206879a 100644 (file)
--- a/arch/mips/kernel/ptrace.c
+++ b/arch/mips/kernel/ptrace.c
@@ -210,7 +210,8 @@ int ptrace_get_watch_regs(struct task_struct *child,
        for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
                __put_user(child->thread.watch.mips3264.watchlo[i],
                           &addr->WATCH_STYLE.watchlo[i]);
-               __put_user(child->thread.watch.mips3264.watchhi[i] & 0xfff,
+               __put_user(child->thread.watch.mips3264.watchhi[i] &
+                               (MIPS_WATCHHI_MASK | MIPS_WATCHHI_IRW),
                           &addr->WATCH_STYLE.watchhi[i]);
                __put_user(boot_cpu_data.watch_reg_masks[i],
                           &addr->WATCH_STYLE.watch_masks[i]);
@@ -252,12 +253,12 @@ int ptrace_set_watch_regs(struct task_struct *child,
                }
 #endif
                __get_user(ht[i], &addr->WATCH_STYLE.watchhi[i]);
-               if (ht[i] & ~0xff8)
+               if (ht[i] & ~MIPS_WATCHHI_MASK)
                        return -EINVAL;
        }
        /* Install them. */
        for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
-               if (lt[i] & 7)
+               if (lt[i] & MIPS_WATCHLO_IRW)
                        watch_active = 1;
                child->thread.watch.mips3264.watchlo[i] = lt[i];
                /* Set the G bit. */

diff --git a/arch/mips/kernel/watch.c b/arch/mips/kernel/watch.c
index 9b78e375118e8f451902664a150fbee0cacdfc2c..19fcab7348b16d9ab8538fdc8b83c342ac7a8486 100644 (file)
--- a/arch/mips/kernel/watch.c
+++ b/arch/mips/kernel/watch.c
@@ -25,16 +25,20 @@ void mips_install_watch_registers(struct task_struct *t)
                write_c0_watchlo3(watches->watchlo[3]);
                /* Write 1 to the I, R, and W bits to clear them, and
                   1 to G so all ASIDs are trapped. */
-               write_c0_watchhi3(0x40000007 | watches->watchhi[3]);
+               write_c0_watchhi3(MIPS_WATCHHI_G | MIPS_WATCHHI_IRW |
+                                 watches->watchhi[3]);
        case 3:
                write_c0_watchlo2(watches->watchlo[2]);
-               write_c0_watchhi2(0x40000007 | watches->watchhi[2]);
+               write_c0_watchhi2(MIPS_WATCHHI_G | MIPS_WATCHHI_IRW |
+                                 watches->watchhi[2]);
        case 2:
                write_c0_watchlo1(watches->watchlo[1]);
-               write_c0_watchhi1(0x40000007 | watches->watchhi[1]);
+               write_c0_watchhi1(MIPS_WATCHHI_G | MIPS_WATCHHI_IRW |
+                                 watches->watchhi[1]);
        case 1:
                write_c0_watchlo0(watches->watchlo[0]);
-               write_c0_watchhi0(0x40000007 | watches->watchhi[0]);
+               write_c0_watchhi0(MIPS_WATCHHI_G | MIPS_WATCHHI_IRW |
+                                 watches->watchhi[0]);
        }
 }
 
@@ -51,22 +55,26 @@ void mips_read_watch_registers(void)
        default:
                BUG();
        case 4:
-               watches->watchhi[3] = (read_c0_watchhi3() & 0x0fff);
+               watches->watchhi[3] = (read_c0_watchhi3() &
+                                      (MIPS_WATCHHI_MASK | MIPS_WATCHHI_IRW));
        case 3:
-               watches->watchhi[2] = (read_c0_watchhi2() & 0x0fff);
+               watches->watchhi[2] = (read_c0_watchhi2() &
+                                      (MIPS_WATCHHI_MASK | MIPS_WATCHHI_IRW));
        case 2:
-               watches->watchhi[1] = (read_c0_watchhi1() & 0x0fff);
+               watches->watchhi[1] = (read_c0_watchhi1() &
+                                      (MIPS_WATCHHI_MASK | MIPS_WATCHHI_IRW));
        case 1:
-               watches->watchhi[0] = (read_c0_watchhi0() & 0x0fff);
+               watches->watchhi[0] = (read_c0_watchhi0() &
+                                      (MIPS_WATCHHI_MASK | MIPS_WATCHHI_IRW));
        }
        if (current_cpu_data.watch_reg_use_cnt == 1 &&
-           (watches->watchhi[0] & 7) == 0) {
+           (watches->watchhi[0] & MIPS_WATCHHI_IRW) == 0) {
                /* Pathological case of release 1 architecture that
                 * doesn't set the condition bits.  We assume that
                 * since we got here, the watch condition was met and
                 * signal that the conditions requested in watchlo
                 * were met.  */
-               watches->watchhi[0] |= (watches->watchlo[0] & 7);
+               watches->watchhi[0] |= (watches->watchlo[0] & MIPS_WATCHHI_IRW);
        }
  }
 
@@ -109,86 +117,86 @@ void mips_probe_watch_registers(struct cpuinfo_mips *c)
         * Check which of the I,R and W bits are supported, then
         * disable the register.
         */
-       write_c0_watchlo0(7);
+       write_c0_watchlo0(MIPS_WATCHLO_IRW);
        back_to_back_c0_hazard();
        t = read_c0_watchlo0();
        write_c0_watchlo0(0);
-       c->watch_reg_masks[0] = t & 7;
+       c->watch_reg_masks[0] = t & MIPS_WATCHLO_IRW;
 
        /* Write the mask bits and read them back to determine which
         * can be used. */
        c->watch_reg_count = 1;
        c->watch_reg_use_cnt = 1;
        t = read_c0_watchhi0();
-       write_c0_watchhi0(t | 0xff8);
+       write_c0_watchhi0(t | MIPS_WATCHHI_MASK);
        back_to_back_c0_hazard();
        t = read_c0_watchhi0();
-       c->watch_reg_masks[0] |= (t & 0xff8);
-       if ((t & 0x80000000) == 0)
+       c->watch_reg_masks[0] |= (t & MIPS_WATCHHI_MASK);
+       if ((t & MIPS_WATCHHI_M) == 0)
                return;
 
-       write_c0_watchlo1(7);
+       write_c0_watchlo1(MIPS_WATCHLO_IRW);
        back_to_back_c0_hazard();
        t = read_c0_watchlo1();
        write_c0_watchlo1(0);
-       c->watch_reg_masks[1] = t & 7;
+       c->watch_reg_masks[1] = t & MIPS_WATCHLO_IRW;
 
        c->watch_reg_count = 2;
        c->watch_reg_use_cnt = 2;
        t = read_c0_watchhi1();
-       write_c0_watchhi1(t | 0xff8);
+       write_c0_watchhi1(t | MIPS_WATCHHI_MASK);
        back_to_back_c0_hazard();
        t = read_c0_watchhi1();
-       c->watch_reg_masks[1] |= (t & 0xff8);
-       if ((t & 0x80000000) == 0)
+       c->watch_reg_masks[1] |= (t & MIPS_WATCHHI_MASK);
+       if ((t & MIPS_WATCHHI_M) == 0)
                return;
 
-       write_c0_watchlo2(7);
+       write_c0_watchlo2(MIPS_WATCHLO_IRW);
        back_to_back_c0_hazard();
        t = read_c0_watchlo2();
        write_c0_watchlo2(0);
-       c->watch_reg_masks[2] = t & 7;
+       c->watch_reg_masks[2] = t & MIPS_WATCHLO_IRW;
 
        c->watch_reg_count = 3;
        c->watch_reg_use_cnt = 3;
        t = read_c0_watchhi2();
-       write_c0_watchhi2(t | 0xff8);
+       write_c0_watchhi2(t | MIPS_WATCHHI_MASK);
        back_to_back_c0_hazard();
        t = read_c0_watchhi2();
-       c->watch_reg_masks[2] |= (t & 0xff8);
-       if ((t & 0x80000000) == 0)
+       c->watch_reg_masks[2] |= (t & MIPS_WATCHHI_MASK);
+       if ((t & MIPS_WATCHHI_M) == 0)
                return;
 
-       write_c0_watchlo3(7);
+       write_c0_watchlo3(MIPS_WATCHLO_IRW);
        back_to_back_c0_hazard();
        t = read_c0_watchlo3();
        write_c0_watchlo3(0);
-       c->watch_reg_masks[3] = t & 7;
+       c->watch_reg_masks[3] = t & MIPS_WATCHLO_IRW;
 
        c->watch_reg_count = 4;
        c->watch_reg_use_cnt = 4;
        t = read_c0_watchhi3();
-       write_c0_watchhi3(t | 0xff8);
+       write_c0_watchhi3(t | MIPS_WATCHHI_MASK);
        back_to_back_c0_hazard();
        t = read_c0_watchhi3();
-       c->watch_reg_masks[3] |= (t & 0xff8);
-       if ((t & 0x80000000) == 0)
+       c->watch_reg_masks[3] |= (t & MIPS_WATCHHI_MASK);
+       if ((t & MIPS_WATCHHI_M) == 0)
                return;
 
        /* We use at most 4, but probe and report up to 8. */
        c->watch_reg_count = 5;
        t = read_c0_watchhi4();
-       if ((t & 0x80000000) == 0)
+       if ((t & MIPS_WATCHHI_M) == 0)
                return;
 
        c->watch_reg_count = 6;
        t = read_c0_watchhi5();
-       if ((t & 0x80000000) == 0)
+       if ((t & MIPS_WATCHHI_M) == 0)
                return;
 
        c->watch_reg_count = 7;
        t = read_c0_watchhi6();
-       if ((t & 0x80000000) == 0)
+       if ((t & MIPS_WATCHHI_M) == 0)
                return;
 
        c->watch_reg_count = 8;