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Diffstat (limited to 'scripts/dtc/dtc-parser.y')
| -rw-r--r-- | scripts/dtc/dtc-parser.y | 519 |
1 files changed, 519 insertions, 0 deletions
diff --git a/scripts/dtc/dtc-parser.y b/scripts/dtc/dtc-parser.y new file mode 100644 index 0000000000..ca3f500342 --- /dev/null +++ b/scripts/dtc/dtc-parser.y @@ -0,0 +1,519 @@ +/* + * (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation. 2005. + * + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 + * USA + */ +%{ +#include <stdio.h> +#include <inttypes.h> + +#include "dtc.h" +#include "srcpos.h" + +extern int yylex(void); +extern void yyerror(char const *s); +#define ERROR(loc, ...) \ + do { \ + srcpos_error((loc), "Error", __VA_ARGS__); \ + treesource_error = true; \ + } while (0) + +extern struct dt_info *parser_output; +extern bool treesource_error; +%} + +%union { + char *propnodename; + char *labelref; + uint8_t byte; + struct data data; + + struct { + struct data data; + int bits; + } array; + + struct property *prop; + struct property *proplist; + struct node *node; + struct node *nodelist; + struct reserve_info *re; + uint64_t integer; + unsigned int flags; +} + +%token DT_V1 +%token DT_PLUGIN +%token DT_MEMRESERVE +%token DT_LSHIFT DT_RSHIFT DT_LE DT_GE DT_EQ DT_NE DT_AND DT_OR +%token DT_BITS +%token DT_DEL_PROP +%token DT_DEL_NODE +%token <propnodename> DT_PROPNODENAME +%token <integer> DT_LITERAL +%token <integer> DT_CHAR_LITERAL +%token <byte> DT_BYTE +%token <data> DT_STRING +%token <labelref> DT_LABEL +%token <labelref> DT_REF +%token DT_INCBIN + +%type <data> propdata +%type <data> propdataprefix +%type <flags> header +%type <flags> headers +%type <re> memreserve +%type <re> memreserves +%type <array> arrayprefix +%type <data> bytestring +%type <prop> propdef +%type <proplist> proplist + +%type <node> devicetree +%type <node> nodedef +%type <node> subnode +%type <nodelist> subnodes + +%type <integer> integer_prim +%type <integer> integer_unary +%type <integer> integer_mul +%type <integer> integer_add +%type <integer> integer_shift +%type <integer> integer_rela +%type <integer> integer_eq +%type <integer> integer_bitand +%type <integer> integer_bitxor +%type <integer> integer_bitor +%type <integer> integer_and +%type <integer> integer_or +%type <integer> integer_trinary +%type <integer> integer_expr + +%% + +sourcefile: + headers memreserves devicetree + { + parser_output = build_dt_info($1, $2, $3, + guess_boot_cpuid($3)); + } + ; + +header: + DT_V1 ';' + { + $$ = DTSF_V1; + } + | DT_V1 ';' DT_PLUGIN ';' + { + $$ = DTSF_V1 | DTSF_PLUGIN; + } + ; + +headers: + header + | header headers + { + if ($2 != $1) + ERROR(&@2, "Header flags don't match earlier ones"); + $$ = $1; + } + ; + +memreserves: + /* empty */ + { + $$ = NULL; + } + | memreserve memreserves + { + $$ = chain_reserve_entry($1, $2); + } + ; + +memreserve: + DT_MEMRESERVE integer_prim integer_prim ';' + { + $$ = build_reserve_entry($2, $3); + } + | DT_LABEL memreserve + { + add_label(&$2->labels, $1); + $$ = $2; + } + ; + +devicetree: + '/' nodedef + { + $$ = name_node($2, ""); + } + | devicetree '/' nodedef + { + $$ = merge_nodes($1, $3); + } + + | devicetree DT_LABEL DT_REF nodedef + { + struct node *target = get_node_by_ref($1, $3); + + if (target) { + add_label(&target->labels, $2); + merge_nodes(target, $4); + } else + ERROR(&@3, "Label or path %s not found", $3); + $$ = $1; + } + | devicetree DT_REF nodedef + { + struct node *target = get_node_by_ref($1, $2); + + if (target) + merge_nodes(target, $3); + else + ERROR(&@2, "Label or path %s not found", $2); + $$ = $1; + } + | devicetree DT_DEL_NODE DT_REF ';' + { + struct node *target = get_node_by_ref($1, $3); + + if (target) + delete_node(target); + else + ERROR(&@3, "Label or path %s not found", $3); + + + $$ = $1; + } + ; + +nodedef: + '{' proplist subnodes '}' ';' + { + $$ = build_node($2, $3); + } + ; + +proplist: + /* empty */ + { + $$ = NULL; + } + | proplist propdef + { + $$ = chain_property($2, $1); + } + ; + +propdef: + DT_PROPNODENAME '=' propdata ';' + { + $$ = build_property($1, $3); + } + | DT_PROPNODENAME ';' + { + $$ = build_property($1, empty_data); + } + | DT_DEL_PROP DT_PROPNODENAME ';' + { + $$ = build_property_delete($2); + } + | DT_LABEL propdef + { + add_label(&$2->labels, $1); + $$ = $2; + } + ; + +propdata: + propdataprefix DT_STRING + { + $$ = data_merge($1, $2); + } + | propdataprefix arrayprefix '>' + { + $$ = data_merge($1, $2.data); + } + | propdataprefix '[' bytestring ']' + { + $$ = data_merge($1, $3); + } + | propdataprefix DT_REF + { + $$ = data_add_marker($1, REF_PATH, $2); + } + | propdataprefix DT_INCBIN '(' DT_STRING ',' integer_prim ',' integer_prim ')' + { + FILE *f = srcfile_relative_open($4.val, NULL); + struct data d; + + if ($6 != 0) + if (fseek(f, $6, SEEK_SET) != 0) + die("Couldn't seek to offset %llu in \"%s\": %s", + (unsigned long long)$6, $4.val, + strerror(errno)); + + d = data_copy_file(f, $8); + + $$ = data_merge($1, d); + fclose(f); + } + | propdataprefix DT_INCBIN '(' DT_STRING ')' + { + FILE *f = srcfile_relative_open($4.val, NULL); + struct data d = empty_data; + + d = data_copy_file(f, -1); + + $$ = data_merge($1, d); + fclose(f); + } + | propdata DT_LABEL + { + $$ = data_add_marker($1, LABEL, $2); + } + ; + +propdataprefix: + /* empty */ + { + $$ = empty_data; + } + | propdata ',' + { + $$ = $1; + } + | propdataprefix DT_LABEL + { + $$ = data_add_marker($1, LABEL, $2); + } + ; + +arrayprefix: + DT_BITS DT_LITERAL '<' + { + unsigned long long bits; + + bits = $2; + + if ((bits != 8) && (bits != 16) && + (bits != 32) && (bits != 64)) { + ERROR(&@2, "Array elements must be" + " 8, 16, 32 or 64-bits"); + bits = 32; + } + + $$.data = empty_data; + $$.bits = bits; + } + | '<' + { + $$.data = empty_data; + $$.bits = 32; + } + | arrayprefix integer_prim + { + if ($1.bits < 64) { + uint64_t mask = (1ULL << $1.bits) - 1; + /* + * Bits above mask must either be all zero + * (positive within range of mask) or all one + * (negative and sign-extended). The second + * condition is true if when we set all bits + * within the mask to one (i.e. | in the + * mask), all bits are one. + */ + if (($2 > mask) && (($2 | mask) != -1ULL)) + ERROR(&@2, "Value out of range for" + " %d-bit array element", $1.bits); + } + + $$.data = data_append_integer($1.data, $2, $1.bits); + } + | arrayprefix DT_REF + { + uint64_t val = ~0ULL >> (64 - $1.bits); + + if ($1.bits == 32) + $1.data = data_add_marker($1.data, + REF_PHANDLE, + $2); + else + ERROR(&@2, "References are only allowed in " + "arrays with 32-bit elements."); + + $$.data = data_append_integer($1.data, val, $1.bits); + } + | arrayprefix DT_LABEL + { + $$.data = data_add_marker($1.data, LABEL, $2); + } + ; + +integer_prim: + DT_LITERAL + | DT_CHAR_LITERAL + | '(' integer_expr ')' + { + $$ = $2; + } + ; + +integer_expr: + integer_trinary + ; + +integer_trinary: + integer_or + | integer_or '?' integer_expr ':' integer_trinary { $$ = $1 ? $3 : $5; } + ; + +integer_or: + integer_and + | integer_or DT_OR integer_and { $$ = $1 || $3; } + ; + +integer_and: + integer_bitor + | integer_and DT_AND integer_bitor { $$ = $1 && $3; } + ; + +integer_bitor: + integer_bitxor + | integer_bitor '|' integer_bitxor { $$ = $1 | $3; } + ; + +integer_bitxor: + integer_bitand + | integer_bitxor '^' integer_bitand { $$ = $1 ^ $3; } + ; + +integer_bitand: + integer_eq + | integer_bitand '&' integer_eq { $$ = $1 & $3; } + ; + +integer_eq: + integer_rela + | integer_eq DT_EQ integer_rela { $$ = $1 == $3; } + | integer_eq DT_NE integer_rela { $$ = $1 != $3; } + ; + +integer_rela: + integer_shift + | integer_rela '<' integer_shift { $$ = $1 < $3; } + | integer_rela '>' integer_shift { $$ = $1 > $3; } + | integer_rela DT_LE integer_shift { $$ = $1 <= $3; } + | integer_rela DT_GE integer_shift { $$ = $1 >= $3; } + ; + +integer_shift: + integer_shift DT_LSHIFT integer_add { $$ = $1 << $3; } + | integer_shift DT_RSHIFT integer_add { $$ = $1 >> $3; } + | integer_add + ; + +integer_add: + integer_add '+' integer_mul { $$ = $1 + $3; } + | integer_add '-' integer_mul { $$ = $1 - $3; } + | integer_mul + ; + +integer_mul: + integer_mul '*' integer_unary { $$ = $1 * $3; } + | integer_mul '/' integer_unary + { + if ($3 != 0) { + $$ = $1 / $3; + } else { + ERROR(&@$, "Division by zero"); + $$ = 0; + } + } + | integer_mul '%' integer_unary + { + if ($3 != 0) { + $$ = $1 % $3; + } else { + ERROR(&@$, "Division by zero"); + $$ = 0; + } + } + | integer_unary + ; + +integer_unary: + integer_prim + | '-' integer_unary { $$ = -$2; } + | '~' integer_unary { $$ = ~$2; } + | '!' integer_unary { $$ = !$2; } + ; + +bytestring: + /* empty */ + { + $$ = empty_data; + } + | bytestring DT_BYTE + { + $$ = data_append_byte($1, $2); + } + | bytestring DT_LABEL + { + $$ = data_add_marker($1, LABEL, $2); + } + ; + +subnodes: + /* empty */ + { + $$ = NULL; + } + | subnode subnodes + { + $$ = chain_node($1, $2); + } + | subnode propdef + { + ERROR(&@2, "Properties must precede subnodes"); + YYERROR; + } + ; + +subnode: + DT_PROPNODENAME nodedef + { + $$ = name_node($2, $1); + } + | DT_DEL_NODE DT_PROPNODENAME ';' + { + $$ = name_node(build_node_delete(), $2); + } + | DT_LABEL subnode + { + add_label(&$2->labels, $1); + $$ = $2; + } + ; + +%% + +void yyerror(char const *s) +{ + ERROR(&yylloc, "%s", s); +} |