diff options
Diffstat (limited to 'arch/ppc64/xmon/start.c')
-rw-r--r-- | arch/ppc64/xmon/start.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/arch/ppc64/xmon/start.c b/arch/ppc64/xmon/start.c new file mode 100644 index 00000000000..a9265bcc79b --- /dev/null +++ b/arch/ppc64/xmon/start.c @@ -0,0 +1,185 @@ +/* + * Copyright (C) 1996 Paul Mackerras. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ +#include <linux/config.h> +#include <linux/string.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/sysrq.h> +#include <linux/init.h> +#include <asm/machdep.h> +#include <asm/io.h> +#include <asm/page.h> +#include <asm/prom.h> +#include <asm/processor.h> +#include <asm/udbg.h> +#include <asm/system.h> +#include "nonstdio.h" + +#ifdef CONFIG_MAGIC_SYSRQ + +static void sysrq_handle_xmon(int key, struct pt_regs *pt_regs, + struct tty_struct *tty) +{ + /* ensure xmon is enabled */ + xmon_init(); + debugger(pt_regs); +} + +static struct sysrq_key_op sysrq_xmon_op = +{ + .handler = sysrq_handle_xmon, + .help_msg = "Xmon", + .action_msg = "Entering xmon", +}; + +static int __init setup_xmon_sysrq(void) +{ + register_sysrq_key('x', &sysrq_xmon_op); + return 0; +} +__initcall(setup_xmon_sysrq); +#endif /* CONFIG_MAGIC_SYSRQ */ + +int +xmon_write(void *handle, void *ptr, int nb) +{ + return udbg_write(ptr, nb); +} + +int +xmon_read(void *handle, void *ptr, int nb) +{ + return udbg_read(ptr, nb); +} + +int +xmon_read_poll(void) +{ + return udbg_getc_poll(); +} + +FILE *xmon_stdin; +FILE *xmon_stdout; + +int +xmon_putc(int c, void *f) +{ + char ch = c; + + if (c == '\n') + xmon_putc('\r', f); + return xmon_write(f, &ch, 1) == 1? c: -1; +} + +int +xmon_putchar(int c) +{ + return xmon_putc(c, xmon_stdout); +} + +int +xmon_fputs(char *str, void *f) +{ + int n = strlen(str); + + return xmon_write(f, str, n) == n? 0: -1; +} + +int +xmon_readchar(void) +{ + char ch; + + for (;;) { + switch (xmon_read(xmon_stdin, &ch, 1)) { + case 1: + return ch; + case -1: + xmon_printf("read(stdin) returned -1\r\n", 0, 0); + return -1; + } + } +} + +static char line[256]; +static char *lineptr; +static int lineleft; + +int +xmon_getchar(void) +{ + int c; + + if (lineleft == 0) { + lineptr = line; + for (;;) { + c = xmon_readchar(); + if (c == -1 || c == 4) + break; + if (c == '\r' || c == '\n') { + *lineptr++ = '\n'; + xmon_putchar('\n'); + break; + } + switch (c) { + case 0177: + case '\b': + if (lineptr > line) { + xmon_putchar('\b'); + xmon_putchar(' '); + xmon_putchar('\b'); + --lineptr; + } + break; + case 'U' & 0x1F: + while (lineptr > line) { + xmon_putchar('\b'); + xmon_putchar(' '); + xmon_putchar('\b'); + --lineptr; + } + break; + default: + if (lineptr >= &line[sizeof(line) - 1]) + xmon_putchar('\a'); + else { + xmon_putchar(c); + *lineptr++ = c; + } + } + } + lineleft = lineptr - line; + lineptr = line; + } + if (lineleft == 0) + return -1; + --lineleft; + return *lineptr++; +} + +char * +xmon_fgets(char *str, int nb, void *f) +{ + char *p; + int c; + + for (p = str; p < str + nb - 1; ) { + c = xmon_getchar(); + if (c == -1) { + if (p == str) + return NULL; + break; + } + *p++ = c; + if (c == '\n') + break; + } + *p = 0; + return str; +} |