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Diffstat (limited to '')
| -rw-r--r-- | c/src/lib/libbsp/i386/pc386/console/gdb_select.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/i386/pc386/console/gdb_select.c b/c/src/lib/libbsp/i386/pc386/console/gdb_select.c new file mode 100644 index 0000000000..8e646586f6 --- /dev/null +++ b/c/src/lib/libbsp/i386/pc386/console/gdb_select.c @@ -0,0 +1,169 @@ +/** + * @file + * + * @ingroup GDB + * + * @brief pc386 gdb select + * + * This file contains a routine to enable and select the UART the gdb stub + * connects too. Currently limited to COM1 and COM2. See + * shared/comm/i386-stub-glue.c file. + */ + +/* + * COPYRIGHT (c) 2016. + * Chris Johns <chrisj@rtems.org> + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.rtems.org/license/LICENSE. + */ + +#include <stdlib.h> + +#include <bsp.h> +#include <rtems/libio.h> +#include <rtems/console.h> +#include <rtems/termiostypes.h> +#include <libchip/serial.h> +#include <libchip/ns16550.h> +#include <bsp/bspimpl.h> + +#include "../../../shared/console_private.h" + +/* + * Used in the stub to print output. + */ +int remote_debug; +/* + * Defined in the stub, used here. + */ +void set_debug_traps(void); + +/* + * Added here to get a valid baudrate. Needs to go once we + * move to the standard UART driver. + */ +int BSPBaseBaud; + +static bool gdb_port_probe(int minor) +{ + /* Return false as GDB has claimed the port */ + return false; +} + +void pc386_parse_gdb_arguments(void) +{ + static const char *opt; + + /* + * Check the command line to see if com1-com4 are disabled. + */ + opt = bsp_cmdline_arg("--gdb="); + if ( opt ) { + const char *option; + const char *comma; + size_t length; + size_t index; + rtems_device_minor_number minor; + uint32_t baudrate = 115200; + bool halt = false; + console_tbl *port; + + /* + * Fine the length, there can be more command line visible. + */ + length = 0; + while ((opt[length] != ' ') && (opt[length] != '\0')) { + ++length; + if (length > NAME_MAX) { + printk("invalid option (--gdb): too long\n"); + return; + } + } + + /* + * Only match up to a comma or NULL + */ + index = 0; + while ((opt[index] != '=') && (index < length)) { + ++index; + } + + if (opt[index] != '=') { + printk("invalid option (--gdb): no equals\n"); + return; + } + + ++index; + option = &opt[index]; + + while ((opt[index] != ',') && (index < length)) { + ++index; + } + + if (opt[index] == ',') + comma = &opt[index]; + else + comma = NULL; + + length = &opt[index] - option; + + port = console_find_console_entry( option, length, &minor ); + + if ( port == NULL ) { + printk("invalid option (--gdb): port not found\n"); + return; + } + + if (comma) { + option = comma + 1; + baudrate = strtoul(option, 0, 10); + switch (baudrate) { + case 115200: + case 57600: + case 38400: + case 19200: + case 9600: + case 4800: + port->pDeviceParams = (void*) baudrate; + BSPBaseBaud = baudrate; /* REMOVE ME */ + break; + default: + printk("invalid option (--gdb): bad baudrate\n"); + return; + } + } + + /* + * Provide a probe that fails so the device is not part of termios. All + * functions are polling. + */ + port->deviceProbe = gdb_port_probe; + port->pDeviceFns = &ns16550_fns_polled; + + opt = bsp_cmdline_arg("--gdb-remote-debug"); + if ( opt ) { + remote_debug = 1; + } + + opt = bsp_cmdline_arg("--gdb-break"); + if ( opt ) { + halt = true; + } + + printk("GDB stub: enable %s%s%s\n", + port->sDeviceName, + remote_debug ? ", remote-debug" : "", + halt ? ", halting" : ""); + + i386_stub_glue_init(minor); + set_debug_traps(); + i386_stub_glue_init_breakin(); + + if ( halt ) { + printk("GDB stub: waiting for remote connection..\n"); + breakpoint(); + } + } +} |