diff options
Diffstat (limited to 'common/cmd_setexpr.c')
| -rw-r--r-- | common/cmd_setexpr.c | 34 |
1 files changed, 30 insertions, 4 deletions
diff --git a/common/cmd_setexpr.c b/common/cmd_setexpr.c index f8b5d4d..2d37197 100644 --- a/common/cmd_setexpr.c +++ b/common/cmd_setexpr.c @@ -28,10 +28,33 @@ #include <config.h> #include <command.h> +static ulong get_arg(char *s, int w) +{ + ulong *p; + + /* + * if the parameter starts with a '*' then assume + * it is a pointer to the value we want + */ + + if (s[0] == '*') { + p = (ulong *)simple_strtoul(&s[1], NULL, 16); + switch (w) { + case 1: return((ulong)(*(uchar *)p)); + case 2: return((ulong)(*(ushort *)p)); + case 4: + default: return(*p); + } + } else { + return simple_strtoul(s, NULL, 16); + } +} + int do_setexpr(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) { ulong a, b; char buf[16]; + int w; /* Validate arguments */ if ((argc != 5) || (strlen(argv[3]) != 1)) { @@ -39,8 +62,10 @@ int do_setexpr(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) return 1; } - a = simple_strtoul(argv[2], NULL, 16); - b = simple_strtoul(argv[4], NULL, 16); + w = cmd_get_data_size(argv[0], 4); + + a = get_arg(argv[2], w); + b = get_arg(argv[4], w); switch (argv[3][0]) { case '|': sprintf(buf, "%lx", (a | b)); break; @@ -64,7 +89,8 @@ int do_setexpr(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) U_BOOT_CMD( setexpr, 5, 0, do_setexpr, "set environment variable as the result of eval expression", - "name value1 <op> value2\n" + "[.b, .w, .l] name value1 <op> value2\n" " - set environment variable 'name' to the result of the evaluated\n" - " express specified by <op>. <op> can be &, |, ^, +, -, *, /, %" + " express specified by <op>. <op> can be &, |, ^, +, -, *, /, %\n" + " size argument is only meaningful if value1 and/or value2 are memory addresses" ); |