MIPS: traps: Correct the SIGTRAP debug ABI in `do_watch' and `do_trap_or_bp'

Follow our own rules set in <asm/siginfo.h> for SIGTRAP signals issued
from `do_watch' and `do_trap_or_bp' by setting the signal code to
TRAP_HWBKPT and TRAP_BRKPT respectively, for Watch exceptions and for
those Breakpoint exceptions whose originating BREAK instruction's code
does not have a special meaning.  Keep Trap exceptions unaffected as
these are not debug events.

No existing user software is expected to examine signal codes for these
signals as SI_KERNEL has been always used here.  This change makes the
MIPS port more like other Linux ports, which reduces the complexity and
provides for performance improvement in GDB.

Signed-off-by: Maciej W. Rozycki <macro@imgtec.com>
Cc: Pedro Alves <palves@redhat.com>
Cc: Luis Machado <lgustavo@codesourcery.com>
Cc: linux-mips@linux-mips.org
Cc: gdb@sourceware.org
Patchwork: https://patchwork.linux-mips.org/patch/12758/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

3 files changed, 20 insertions, 12 deletions

diff --git a/arch/mips/include/asm/mips-r2-to-r6-emul.h b/arch/mips/include/asm/mips-r2-to-r6-emul.h
index 1f6ea8352ca9..20621e1ca238 100644
--- a/arch/mips/include/asm/mips-r2-to-r6-emul.h
+++ b/arch/mips/include/asm/mips-r2-to-r6-emul.h
@@ -79,7 +79,7 @@ struct r2_decoder_table {
 };
 
 
-extern void do_trap_or_bp(struct pt_regs *regs, unsigned int code,
+extern void do_trap_or_bp(struct pt_regs *regs, unsigned int code, int si_code,
                           const char *str);
 
 #ifndef CONFIG_MIPSR2_TO_R6_EMULATOR
diff --git a/arch/mips/kernel/mips-r2-to-r6-emul.c b/arch/mips/kernel/mips-r2-to-r6-emul.c
index 1f5aac7f9ec3..3fff89ae760b 100644
--- a/arch/mips/kernel/mips-r2-to-r6-emul.c
+++ b/arch/mips/kernel/mips-r2-to-r6-emul.c
@@ -940,42 +940,42 @@ repeat:
                 switch (rt) {
                 case tgei_op:
                         if ((long)regs->regs[rs] >= MIPSInst_SIMM(inst))
-                                do_trap_or_bp(regs, 0, "TGEI");
+                                do_trap_or_bp(regs, 0, 0, "TGEI");
 
                         MIPS_R2_STATS(traps);
 
                         break;
                 case tgeiu_op:
                         if (regs->regs[rs] >= MIPSInst_UIMM(inst))
-                                do_trap_or_bp(regs, 0, "TGEIU");
+                                do_trap_or_bp(regs, 0, 0, "TGEIU");
 
                         MIPS_R2_STATS(traps);
 
                         break;
                 case tlti_op:
                         if ((long)regs->regs[rs] < MIPSInst_SIMM(inst))
-                                do_trap_or_bp(regs, 0, "TLTI");
+                                do_trap_or_bp(regs, 0, 0, "TLTI");
 
                         MIPS_R2_STATS(traps);
 
                         break;
                 case tltiu_op:
                         if (regs->regs[rs] < MIPSInst_UIMM(inst))
-                                do_trap_or_bp(regs, 0, "TLTIU");
+                                do_trap_or_bp(regs, 0, 0, "TLTIU");
 
                         MIPS_R2_STATS(traps);
 
                         break;
                 case teqi_op:
                         if (regs->regs[rs] == MIPSInst_SIMM(inst))
-                                do_trap_or_bp(regs, 0, "TEQI");
+                                do_trap_or_bp(regs, 0, 0, "TEQI");
 
                         MIPS_R2_STATS(traps);
 
                         break;
                 case tnei_op:
                         if (regs->regs[rs] != MIPSInst_SIMM(inst))
-                                do_trap_or_bp(regs, 0, "TNEI");
+                                do_trap_or_bp(regs, 0, 0, "TNEI");
 
                         MIPS_R2_STATS(traps);
 
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index e701eb0aa99c..80339ce64521 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -56,6 +56,7 @@
 #include <asm/pgtable.h>
 #include <asm/ptrace.h>
 #include <asm/sections.h>
+#include <asm/siginfo.h>
 #include <asm/tlbdebug.h>
 #include <asm/traps.h>
 #include <asm/uaccess.h>
@@ -871,7 +872,7 @@ out:
         exception_exit(prev_state);
 }
 
-void do_trap_or_bp(struct pt_regs *regs, unsigned int code,
+void do_trap_or_bp(struct pt_regs *regs, unsigned int code, int si_code,
         const char *str)
 {
         siginfo_t info = { 0 };
@@ -928,7 +929,13 @@ void do_trap_or_bp(struct pt_regs *regs, unsigned int code,
         default:
                 scnprintf(b, sizeof(b), "%s instruction in kernel code", str);
                 die_if_kernel(b, regs);
-                force_sig(SIGTRAP, current);
+                if (si_code) {
+                        info.si_signo = SIGTRAP;
+                        info.si_code = si_code;
+                        force_sig_info(SIGTRAP, &info, current);
+                } else {
+                        force_sig(SIGTRAP, current);
+                }
         }
 }
 
@@ -1012,7 +1019,7 @@ asmlinkage void do_bp(struct pt_regs *regs)
                 break;
         }
 
-        do_trap_or_bp(regs, bcode, "Break");
+        do_trap_or_bp(regs, bcode, TRAP_BRKPT, "Break");
 
 out:
         set_fs(seg);
@@ -1054,7 +1061,7 @@ asmlinkage void do_tr(struct pt_regs *regs)
                         tcode = (opcode >> 6) & ((1 << 10) - 1);
         }
 
-        do_trap_or_bp(regs, tcode, "Trap");
+        do_trap_or_bp(regs, tcode, 0, "Trap");
 
 out:
         set_fs(seg);
@@ -1492,6 +1499,7 @@ asmlinkage void do_mdmx(struct pt_regs *regs)
  */
 asmlinkage void do_watch(struct pt_regs *regs)
 {
+        siginfo_t info = { .si_signo = SIGTRAP, .si_code = TRAP_HWBKPT };
         enum ctx_state prev_state;
         u32 cause;
 
@@ -1512,7 +1520,7 @@ asmlinkage void do_watch(struct pt_regs *regs)
         if (test_tsk_thread_flag(current, TIF_LOAD_WATCH)) {
                 mips_read_watch_registers();
                 local_irq_enable();
-                force_sig(SIGTRAP, current);
+                force_sig_info(SIGTRAP, &info, current);
         } else {
                 mips_clear_watch_registers();
                 local_irq_enable();