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| author | Jeff Law <law@gcc.gnu.org> | 1996-05-07 11:42:26 -0600 |
|---|---|---|
| committer | Jeff Law <law@gcc.gnu.org> | 1996-05-07 11:42:26 -0600 |
| commit | 637dec4188ed71b4d2e0bf04acb97b4ca19980af (patch) | |
| tree | 8f6ad209bbe87403c1a3652e54dec532f749e9a4 /gcc/config/h8300 | |
| parent | d51602543daf0e69f1bff13cccedab38d14e4c87 (diff) | |
| download | gcc-637dec4188ed71b4d2e0bf04acb97b4ca19980af.zip gcc-637dec4188ed71b4d2e0bf04acb97b4ca19980af.tar.gz gcc-637dec4188ed71b4d2e0bf04acb97b4ca19980af.tar.bz2 | |
h8300.h (READONLY_DATA_SECTION): Define.
* h8300/h8300.h (READONLY_DATA_SECTION): Define.
(EXTRA_SECTIONS): Add in_readonly_data.
(READONLY_DATA_SECTION_ASM_OP): Define.
(EXTRA_SECTION_FUNCTINOS): Add readonly_data.
From-SVN: r11951
Diffstat (limited to 'gcc/config/h8300')
| -rw-r--r-- | gcc/config/h8300/h8300.h | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/gcc/config/h8300/h8300.h b/gcc/config/h8300/h8300.h index 0b6667e..6109a85 100644 --- a/gcc/config/h8300/h8300.h +++ b/gcc/config/h8300/h8300.h @@ -1014,7 +1014,14 @@ h8300_valid_machine_decl_attribute (DECL, ATTRIBUTES, IDENTIFIER, ARGS) /* The assembler op to get a word, 2 bytes for the H8/300, 4 for H8/300H. */ #define ASM_WORD_OP (TARGET_H8300 ? ".word" : ".long") -/* Output before read-only data. */ +/* We define a readonly data section solely to remove readonly data + from the instruction stream. This can improve relaxing in two significant + ways. First it's more likely that references to readonly data + can be done with a 16bit absolute address since they'll be in low + memory. Second, it's more likely that jsr instructions can be + turned into bsr instructions since read-only data is not in the + instruction stream. */ +#define READONLY_DATA_SECTION readonly_data #define TEXT_SECTION_ASM_OP "\t.section .text" #define DATA_SECTION_ASM_OP "\t.section .data" @@ -1022,8 +1029,9 @@ h8300_valid_machine_decl_attribute (DECL, ATTRIBUTES, IDENTIFIER, ARGS) #define INIT_SECTION_ASM_OP "\t.section .init" #define CTORS_SECTION_ASM_OP "\t.section .ctors" #define DTORS_SECTION_ASM_OP "\t.section .dtors" +#define READONLY_DATA_SECTION_ASM_OP "\t.section .rodata" -#define EXTRA_SECTIONS in_ctors, in_dtors +#define EXTRA_SECTIONS in_ctors, in_dtors, in_readonly_data #define EXTRA_SECTION_FUNCTIONS \ \ @@ -1046,6 +1054,18 @@ dtors_section() \ in_section = in_dtors; \ } \ } \ + \ +void \ +readonly_data() \ +{ \ + if (in_section != in_readonly_data) \ + { \ + fprintf (asm_out_file, "%s\n", READONLY_DATA_SECTION_ASM_OP);\ + in_section = in_readonly_data; \ + } \ +} + + #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME) \ do { ctors_section(); \ |