From 7e7d57681b2ef3593d29069fb0b77d7daadc3fad Mon Sep 17 00:00:00 2001 From: Alan Modra Date: Sun, 27 Jul 2003 11:58:28 +0000 Subject: [PATCH] * ld.texinfo: Typo fixes. Document SUBALIGN. * ldgram.y (opt_subalign): Add. * ldlex.l (SUBALIGN): Recognize. * ldlang.c (overlay_subalign): New var. (lang_enter_overlay): Add subalign param. (lang_enter_overlay_section): Pass overlay_subalign to lang_enter_output_section_statement. * ldlang.h (lang_enter_overlay): Update. --- ld/ChangeLog | 11 +++++++++++ ld/ld.texinfo | 18 +++++++++++++++--- ld/ldgram.y | 24 +++++++++++++++--------- ld/ldlang.c | 11 ++++++++--- ld/ldlang.h | 2 +- ld/ldlex.l | 1 + 6 files changed, 51 insertions(+), 16 deletions(-) diff --git a/ld/ChangeLog b/ld/ChangeLog index 243caa74949..e1937bd7bb7 100644 --- a/ld/ChangeLog +++ b/ld/ChangeLog @@ -1,3 +1,14 @@ +2003-07-27 Alan Modra + + * ld.texinfo: Typo fixes. Document SUBALIGN. + * ldgram.y (opt_subalign): Add. + * ldlex.l (SUBALIGN): Recognize. + * ldlang.c (overlay_subalign): New var. + (lang_enter_overlay): Add subalign param. + (lang_enter_overlay_section): Pass overlay_subalign to + lang_enter_output_section_statement. + * ldlang.h (lang_enter_overlay): Update. + 2003-07-24 Nick Clifton * po/fr.po: Updated French translation. diff --git a/ld/ld.texinfo b/ld/ld.texinfo index c9691a0a01e..aeeded03657 100644 --- a/ld/ld.texinfo +++ b/ld/ld.texinfo @@ -1217,7 +1217,7 @@ this option overrides it. @xref{BFD}. Create a position independent executable. This is currently only supported on ELF platforms. Position independent executables are similar to shared libraries in that they are relocated by the dynamic linker to the virtual -address OS chooses for them (which can varry between invocations), like +address the OS chooses for them (which can vary between invocations). Like normal dynamically linked executables they can be executed and symbols defined in the executable cannot be overridden by shared libraries. @@ -2686,7 +2686,8 @@ in the first input file. The first section will be at address zero. The full description of an output section looks like this: @smallexample @group -@var{section} [@var{address}] [(@var{type})] : [AT(@var{lma})] +@var{section} [@var{address}] [(@var{type})] : + [AT(@var{lma})] [SUBALIGN(@var{subsection_align})] @{ @var{output-section-command} @var{output-section-command} @@ -3207,7 +3208,8 @@ We showed above that the full description of an output section looked like this: @smallexample @group -@var{section} [@var{address}] [(@var{type})] : [AT(@var{lma})] +@var{section} [@var{address}] [(@var{type})] : + [AT(@var{lma})] [SUBALIGN(@var{subsection_align})] @{ @var{output-section-command} @var{output-section-command} @@ -3222,6 +3224,7 @@ remaining section attributes. @menu * Output Section Type:: Output section type * Output Section LMA:: Output section LMA +* Forced Input Alignment:: Forced Input Alignment * Output Section Region:: Output section region * Output Section Phdr:: Output section phdr * Output Section Fill:: Output section fill @@ -3329,6 +3332,15 @@ for (dst = &_bstart; dst< &_bend; dst++) @end group @end smallexample +@node Forced Input Alignment +@subsubsection Forced Input Alignment +@kindex SUBALIGN(@var{subsection_align}) +@cindex forcing input section alignment +@cindex input section alignment +You can force input section alignment within an output section by using +SUBALIGN. The value specified overrides any alignment given by input +sections, whether larger or smaller. + @node Output Section Region @subsubsection Output Section Region @kindex >@var{region} diff --git a/ld/ldgram.y b/ld/ldgram.y index 22dbb248ce4..9038ebc1ae4 100644 --- a/ld/ldgram.y +++ b/ld/ldgram.y @@ -1,6 +1,6 @@ /* A YACC grammar to parse a superset of the AT&T linker scripting language. Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, - 2001, 2002 Free Software Foundation, Inc. + 2001, 2002, 2003 Free Software Foundation, Inc. Written by Steve Chamberlain of Cygnus Support (steve@cygnus.com). This file is part of GNU ld. @@ -94,7 +94,7 @@ static int error_index; } %type exp opt_exp_with_type mustbe_exp opt_at phdr_type phdr_val -%type opt_exp_without_type +%type opt_exp_without_type opt_subalign %type fill_opt fill_exp %type exclude_name_list %type file_NAME_list @@ -142,7 +142,7 @@ static int error_index; %token STARTUP HLL SYSLIB FLOAT NOFLOAT NOCROSSREFS %token ORIGIN FILL %token LENGTH CREATE_OBJECT_SYMBOLS INPUT GROUP OUTPUT CONSTRUCTORS -%token ALIGNMOD AT PROVIDE +%token ALIGNMOD AT SUBALIGN PROVIDE %type assign_op atype attributes_opt %type filename %token CHIP LIST SECT ABSOLUTE LOAD NEWLINE ENDWORD ORDER NAMEWORD ASSERT_K @@ -828,31 +828,37 @@ opt_at: | { $$ = 0; } ; +opt_subalign: + SUBALIGN '(' exp ')' { $$ = $3; } + | { $$ = 0; } + ; + section: NAME { ldlex_expression(); } opt_exp_with_type - opt_at { ldlex_popstate (); ldlex_script (); } + opt_at + opt_subalign { ldlex_popstate (); ldlex_script (); } '{' { lang_enter_output_section_statement($1, $3, sectype, - 0, 0, 0, $4); + 0, 0, $5, $4); } statement_list_opt '}' { ldlex_popstate (); ldlex_expression (); } memspec_opt memspec_at_opt phdr_opt fill_opt { ldlex_popstate (); - lang_leave_output_section_statement ($14, $11, $13, $12); + lang_leave_output_section_statement ($15, $12, $14, $13); } opt_comma {} | OVERLAY { ldlex_expression (); } - opt_exp_without_type opt_nocrossrefs opt_at + opt_exp_without_type opt_nocrossrefs opt_at opt_subalign { ldlex_popstate (); ldlex_script (); } '{' { - lang_enter_overlay ($3); + lang_enter_overlay ($3, $6); } overlay_section '}' @@ -861,7 +867,7 @@ section: NAME { ldlex_expression(); } { ldlex_popstate (); lang_leave_overlay ($5, (int) $4, - $15, $12, $14, $13); + $16, $13, $15, $14); } opt_comma | /* The GROUP case is just enough to support the gcc diff --git a/ld/ldlang.c b/ld/ldlang.c index 56d65eb40ab..f443acd058b 100644 --- a/ld/ldlang.c +++ b/ld/ldlang.c @@ -4649,6 +4649,8 @@ lang_add_nocrossref (struct lang_nocrossref *l) /* The overlay virtual address. */ static etree_type *overlay_vma; +/* And subsection alignment. */ +static etree_type *overlay_subalign; /* An expression for the maximum section size seen so far. */ static etree_type *overlay_max; @@ -4665,12 +4667,15 @@ static struct overlay_list *overlay_list; /* Start handling an overlay. */ void -lang_enter_overlay (etree_type *vma_expr) +lang_enter_overlay (etree_type *vma_expr, etree_type *subalign) { /* The grammar should prevent nested overlays from occurring. */ - ASSERT (overlay_vma == NULL && overlay_max == NULL); + ASSERT (overlay_vma == NULL + && overlay_subalign == NULL + && overlay_max == NULL); overlay_vma = vma_expr; + overlay_subalign = subalign; } /* Start a section in an overlay. We handle this by calling @@ -4684,7 +4689,7 @@ lang_enter_overlay_section (const char *name) etree_type *size; lang_enter_output_section_statement (name, overlay_vma, normal_section, - 0, 0, 0, 0); + 0, 0, overlay_subalign, 0); /* If this is the first section, then base the VMA of future sections on this one. This will work correctly even if `.' is diff --git a/ld/ldlang.h b/ld/ldlang.h index 9fc930b03af..d3e87b128b7 100644 --- a/ld/ldlang.h +++ b/ld/ldlang.h @@ -492,7 +492,7 @@ extern void lang_new_phdr extern void lang_add_nocrossref (struct lang_nocrossref *); extern void lang_enter_overlay - (etree_type *); + (etree_type *, etree_type *); extern void lang_enter_overlay_section (const char *); extern void lang_leave_overlay_section diff --git a/ld/ldlex.l b/ld/ldlex.l index b55ebe77dda..b52e1cfd7be 100644 --- a/ld/ldlex.l +++ b/ld/ldlex.l @@ -306,6 +306,7 @@ V_IDENTIFIER [*?.$_a-zA-Z\[\]\-\!\^]([*?.$_a-zA-Z0-9\[\]\-\!\^]|::)* "INCLUDE" { RTOKEN(INCLUDE);} "PHDRS" { RTOKEN (PHDRS); } "AT" { RTOKEN(AT);} +"SUBALIGN" { RTOKEN(SUBALIGN);} "PROVIDE" { RTOKEN(PROVIDE); } "KEEP" { RTOKEN(KEEP); } "EXCLUDE_FILE" { RTOKEN(EXCLUDE_FILE); } -- 2.30.2