diff options
Diffstat (limited to 'gas/config')
| -rw-r--r-- | gas/config/tc-msp430.c | 53 | ||||
| -rw-r--r-- | gas/config/tc-msp430.h | 7 |
2 files changed, 56 insertions, 4 deletions
diff --git a/gas/config/tc-msp430.c b/gas/config/tc-msp430.c index 6c794f9..a9aa0ea 100644 --- a/gas/config/tc-msp430.c +++ b/gas/config/tc-msp430.c @@ -1220,6 +1220,18 @@ md_parse_option (int c, char * arg) return 0; } +/* The intention here is to have the mere presence of these sections + cause the object to have a reference to a well-known symbol. This + reference pulls in the bits of the runtime (crt0) that initialize + these sections. Thus, for example, the startup code to call + memset() to initialize .bss will only be linked in when there is a + non-empty .bss section. Otherwise, the call would exist but have a + zero length parameter, which is a waste of memory and cycles. + + The code which initializes these sections should have a global + label for these symbols, and should be marked with KEEP() in the + linker script. + */ static void msp430_section (int arg) { @@ -1230,15 +1242,48 @@ msp430_section (int arg) || strncmp (name, ".gnu.linkonce.b.", 16) == 0) (void) symbol_find_or_make ("__crt0_init_bss"); - if (move_data - && (strncmp (name, ".data", 5) == 0 - || strncmp (name, ".gnu.linkonce.d.", 16) == 0)) + if (strncmp (name, ".data", 5) == 0 + || strncmp (name, ".gnu.linkonce.d.", 16) == 0) (void) symbol_find_or_make ("__crt0_movedata"); input_line_pointer = saved_ilp; obj_elf_section (arg); } +void +msp430_frob_section (asection *sec) +{ + const char *name = sec->name; + + if (sec->size == 0) + return; + + if (strncmp (name, ".bss", 4) == 0 + || strncmp (name, ".gnu.linkonce.b.", 16) == 0) + (void) symbol_find_or_make ("__crt0_init_bss"); + + if (strncmp (name, ".data", 5) == 0 + || strncmp (name, ".gnu.linkonce.d.", 16) == 0) + (void) symbol_find_or_make ("__crt0_movedata"); +} + +static void +msp430_lcomm (int ignore ATTRIBUTE_UNUSED) +{ + symbolS *symbolP = s_comm_internal (0, s_lcomm_internal); + + if (symbolP) + symbol_get_bfdsym (symbolP)->flags |= BSF_OBJECT; + (void) symbol_find_or_make ("__crt0_init_bss"); +} + +static void +msp430_comm (int needs_align) +{ + s_comm_internal (needs_align, elf_common_parse); + (void) symbol_find_or_make ("__crt0_init_bss"); +} + static void msp430_refsym (int arg ATTRIBUTE_UNUSED) { @@ -1259,6 +1304,8 @@ const pseudo_typeS md_pseudo_table[] = {"sect.s", msp430_section, 0}, {"pushsection", msp430_section, 1}, {"refsym", msp430_refsym, 0}, + {"comm", msp430_comm, 0}, + {"lcomm", msp430_lcomm, 0}, {NULL, NULL, 0} }; diff --git a/gas/config/tc-msp430.h b/gas/config/tc-msp430.h index f805f66..5f14bbf 100644 --- a/gas/config/tc-msp430.h +++ b/gas/config/tc-msp430.h @@ -1,5 +1,5 @@ /* This file is tc-msp430.h - Copyright (C) 2002-2013 Free Software Foundation, Inc. + Copyright (C) 2002-2014 Free Software Foundation, Inc. Contributed by Dmitry Diky <diwil@mail.ru> @@ -120,6 +120,11 @@ extern long msp430_relax_frag (segT, fragS *, long); msp430_force_relocation_local (FIX) extern int msp430_force_relocation_local (struct fix *); +/* We need to add reference symbols for .data/.bss. */ +#define tc_frob_section(sec) msp430_frob_section (sec) +extern void msp430_frob_section (asection *); + + extern int msp430_enable_relax; extern int msp430_enable_polys; |