Revert "Merge patch series "arm: dts: am62-beagleplay: Fix Beagleplay Ethernet""

[u-boot.git] / common / kgdb.c

diff --git a/common/kgdb.c b/common/kgdb.c
index 1d346699a56ecfaafececc42a0d4813cca7351da..29b09fcfe56b3cf4d6a69b54dbdc9dd0af648be2 100644 (file)
--- a/common/kgdb.c
+++ b/common/kgdb.c
@@ -1,4 +1,4 @@
-/* taken from arch/ppc/kernel/ppc-stub.c */
+/* taken from arch/powerpc/kernel/ppc-stub.c */
 
 /****************************************************************************
 
@@ -88,12 +88,11 @@
  ****************************************************************************/
 
 #include <common.h>
+#include <asm/ptrace.h>
 
 #include <kgdb.h>
 #include <command.h>
 
-#if defined(CONFIG_CMD_KGDB)
-
 #undef KGDB_DEBUG
 
 /*
@@ -105,9 +104,9 @@ static char remcomOutBuffer[BUFMAX];
 static char remcomRegBuffer[BUFMAX];
 
 static int initialized = 0;
-static int kgdb_active = 0, first_entry = 1;
+static int kgdb_active;
 static struct pt_regs entry_regs;
-static u_int error_jmp_buf[BUFMAX/2];
+static long error_jmp_buf[BUFMAX/2];
 static int longjmp_on_fault = 0;
 #ifdef KGDB_DEBUG
 static int kdebug = 1;
@@ -134,11 +133,20 @@ hex(unsigned char ch)
 static unsigned char *
 mem2hex(char *mem, char *buf, int count)
 {
+       char *tmp;
        unsigned char ch;
 
+       /*
+        * We use the upper half of buf as an intermediate buffer for the
+        * raw memory copy.  Hex conversion will work against this one.
+        */
+       tmp = buf + count;
        longjmp_on_fault = 1;
+
+       memcpy(tmp, mem, count);
+
        while (count-- > 0) {
-               ch = *mem++;
+               ch = *tmp++;
                *buf++ = hexchars[ch >> 4];
                *buf++ = hexchars[ch & 0xf];
        }
@@ -153,21 +161,33 @@ mem2hex(char *mem, char *buf, int count)
 static char *
 hex2mem(char *buf, char *mem, int count)
 {
-       int i, hexValue;
-       unsigned char ch;
-       char *mem_start = mem;
+       int hexValue;
+       char *tmp_raw, *tmp_hex;
+
+       /*
+        * We use the upper half of buf as an intermediate buffer for the
+        * raw memory that is converted from hex.
+        */
+       tmp_raw = buf + count * 2;
+       tmp_hex = tmp_raw - 1;
 
        longjmp_on_fault = 1;
-       for (i=0; i<count; i++) {
-               if ((hexValue = hex(*buf++)) < 0)
+       while (tmp_hex >= buf) {
+               tmp_raw--;
+               hexValue = hex(*tmp_hex--);
+               if (hexValue < 0)
                        kgdb_error(KGDBERR_NOTHEXDIG);
-               ch = hexValue << 4;
-               if ((hexValue = hex(*buf++)) < 0)
+               *tmp_raw = hexValue;
+               hexValue = hex(*tmp_hex--);
+               if (hexValue < 0)
                        kgdb_error(KGDBERR_NOTHEXDIG);
-               ch |= hexValue;
-               *mem++ = ch;
+               *tmp_raw |= hexValue << 4;
+
        }
-       kgdb_flush_cache_range((void *)mem_start, (void *)(mem - 1));
+
+       memcpy(mem, tmp_raw, count);
+
+       kgdb_flush_cache_range((void *)mem, (void *)(mem+count));
        longjmp_on_fault = 0;
 
        return buf;
@@ -307,10 +327,10 @@ handle_exception (struct pt_regs *regs)
                return (0);
        }
 
-       /* probably should check which exception occured as well */
+       /* probably should check which exception occurred as well */
        if (longjmp_on_fault) {
                longjmp_on_fault = 0;
-               kgdb_longjmp((long*)error_jmp_buf, KGDBERR_MEMFAULT);
+               kgdb_longjmp(error_jmp_buf, KGDBERR_MEMFAULT);
                panic("kgdb longjump failed!\n");
        }
 
@@ -324,21 +344,12 @@ handle_exception (struct pt_regs *regs)
 
        printf("kgdb: handle_exception; trap [0x%x]\n", kgdb_trap(regs));
 
-       if (kgdb_setjmp((long*)error_jmp_buf) != 0)
+       if (kgdb_setjmp(error_jmp_buf) != 0)
                panic("kgdb: error or fault in entry init!\n");
 
        kgdb_enter(regs, &kd);
 
-       if (first_entry) {
-               /*
-                * the first time we enter kgdb, we save the processor
-                * state so that we can return to the monitor if the
-                * remote end quits gdb (or at least, tells us to quit
-                * with the 'k' packet)
-                */
-               entry_regs = *regs;
-               first_entry = 0;
-       }
+       entry_regs = *regs;
 
        ptr = remcomOutBuffer;
 
@@ -379,7 +390,7 @@ handle_exception (struct pt_regs *regs)
                        printf("kgdb:  remcomInBuffer: %s\n", remcomInBuffer);
 #endif
 
-               errnum = kgdb_setjmp((long*)error_jmp_buf);
+               errnum = kgdb_setjmp(error_jmp_buf);
 
                if (errnum == 0) switch (remcomInBuffer[0]) {
 
@@ -440,7 +451,6 @@ handle_exception (struct pt_regs *regs)
                case 'k':    /* kill the program, actually return to monitor */
                        kd.extype = KGDBEXIT_KILL;
                        *regs = entry_regs;
-                       first_entry = 1;
                        goto doexit;
 
                case 'C':    /* CSS  continue with signal SS */
@@ -517,22 +527,25 @@ handle_exception (struct pt_regs *regs)
  * kgdb_init must be called *after* the
  * monitor is relocated into ram
  */
-void
-kgdb_init(void)
+int kgdb_init(void)
 {
+       puts("KGDB:  ");
+
        kgdb_serial_init();
        debugger_exception_handler = handle_exception;
        initialized = 1;
 
        putDebugStr("kgdb ready\n");
        puts("ready\n");
+
+       return 0;
 }
 
 void
 kgdb_error(int errnum)
 {
        longjmp_on_fault = 0;
-       kgdb_longjmp((long*)error_jmp_buf, errnum);
+       kgdb_longjmp(error_jmp_buf, errnum);
        panic("kgdb_error: longjmp failed!\n");
 }
 
@@ -565,7 +578,7 @@ breakpoint(void)
 }
 
 int
-do_kgdb(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+do_kgdb(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
     printf("Entering KGDB mode via exception handler...\n\n");
     kgdb_breakpoint(argc - 1, argv + 1);
@@ -574,8 +587,8 @@ do_kgdb(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 }
 
 U_BOOT_CMD(
-       kgdb, CFG_MAXARGS, 1,   do_kgdb,
-       "kgdb    - enter gdb remote debug mode\n",
+       kgdb, CONFIG_SYS_MAXARGS, 1,    do_kgdb,
+       "enter gdb remote debug mode",
        "[arg0 arg1 .. argN]\n"
        "    - executes a breakpoint so that kgdb mode is\n"
        "      entered via the exception handler. To return\n"
@@ -587,8 +600,3 @@ U_BOOT_CMD(
        "      program if it is executed (see the \"hello_world\"\n"
        "      example program in the U-Boot examples directory)."
 );
-#else
-
-int kgdb_not_configured = 1;
-
-#endif