* config/m68hc11/larith.asm (_exit): Split in several sub-sections
merged by linker script to get a final _exit().
(__do_global_dtors): New for destructor handling in specific exit
section.
(__do_global_ctors): New for constructors in specific install section.
(__map_data_section): Map data sections before running constructors.
* config/m68hc11/m68hc11.h (INT_ASM_OP): Define to use .word.
(CTORS_SECTION_ASM_OP): Define to put in readonly section.
(DTORS_SECTION_ASM_OP): Likewise.
(CTORS_SECTION_FUNCTION): Define to force a reference to
__do_global_ctors.
(DTORS_SECTION_FUNCTION): Likewise for __do_global_dtors.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@44611
138bc75d-0d04-0410-961f-
82ee72b054a4
+2001-08-03 Stephane Carrez <Stephane.Carrez@worldnet.fr>
+
+ * config/m68hc11/t-m68hc11-gas (T_CPPFLAGS): Add _ctor and _dtor.
+ * config/m68hc11/larith.asm (_exit): Split in several sub-sections
+ merged by linker script to get a final _exit().
+ (__do_global_dtors): New for destructor handling in specific exit
+ section.
+ (__do_global_ctors): New for constructors in specific install section.
+ (__map_data_section): Map data sections before running constructors.
+ * config/m68hc11/m68hc11.h (INT_ASM_OP): Define to use .word.
+ (CTORS_SECTION_ASM_OP): Define to put in readonly section.
+ (DTORS_SECTION_ASM_OP): Likewise.
+ (CTORS_SECTION_FUNCTION): Define to force a reference to
+ __do_global_ctors.
+ (DTORS_SECTION_FUNCTION): Likewise for __do_global_dtors.
+
2001-08-03 Daniel Berlin <dan@cgsoftware.com>
* ChangeLog: Fix date on previous ChangeLog entry for GCSE.
;;
;; Exit operation. Just loop forever and wait for interrupts.
;; (no other place to go)
+;; This operation is split in several pieces collected together by
+;; the linker script. This allows to support destructors at the
+;; exit stage while not impacting program sizes when there is no
+;; destructors.
;;
- .sect .text
- .globl _exit
+;; _exit:
+;; *(.fini0) /* Beginning of finish code (_exit symbol). */
+;; *(.fini1) /* Place holder for applications. */
+;; *(.fini2) /* C++ destructors. */
+;; *(.fini3) /* Place holder for applications. */
+;; *(.fini4) /* Runtime exit. */
+;;
+ .sect .fini0,"ax",@progbits
+ .globl _exit
.globl exit
.weak exit
exit:
_exit:
+
+ .sect .fini4,"ax",@progbits
fatal:
cli
wai
#ifdef L_map_data
- .sect .install3,"ax",@progbits
+ .sect .install2,"ax",@progbits
.globl __map_data_section
__map_data_section:
#ifdef L_init_bss
- .sect .install3,"ax",@progbits
+ .sect .install2,"ax",@progbits
.globl __init_bss_section
__init_bss_section:
Done:
#endif
-
+
+#ifdef L_ctor
+
+; End of constructor table
+ .sect .install3,"ax",@progbits
+ .globl __do_global_ctors
+
+__do_global_ctors:
+ ; Start from the end - sizeof(void*)
+ ldx #__CTOR_END__-2
+ctors_loop:
+ cpx #__CTOR_LIST__
+ blt ctors_done
+ pshx
+ ldx 0,x
+ jsr 0,x
+ pulx
+ dex
+ dex
+ bra ctors_loop
+ctors_done:
+
+#endif
+
+#ifdef L_dtor
+
+ .sect .fini3,"ax",@progbits
+ .globl __do_global_dtors
+
+;;
+;; This piece of code is inserted in the _exit() code by the linker.
+;;
+__do_global_dtors:
+ pshb ; Save exit code
+ psha
+ ldx #__DTOR_LIST__
+dtors_loop:
+ cpx #__DTOR_END__
+ bge dtors_done
+ pshx
+ ldx 0,x
+ jsr 0,x
+ pulx
+ inx
+ inx
+ bra dtors_loop
+dtors_done:
+ pula ; Restore exit code
+ pulb
+
+#endif
+
;-----------------------------------------
; end required gcclib code
;-----------------------------------------
/* Output before uninitialized data. */
#define BSS_SECTION_ASM_OP ("\t.sect\t.bss")
+/* This is the pseudo-op used to generate a reference to a specific
+ symbol in some section. It is only used in machine-specific
+ configuration files, typically only in ASM_OUTPUT_CONSTRUCTOR and
+ ASM_OUTPUT_DESTRUCTOR. This is the same for all known svr4
+ assemblers, except those in targets that don't use 32-bit pointers.
+ Those should override INT_ASM_OP. Yes, the name of the macro is
+ misleading. */
+#undef INT_ASM_OP
+#define INT_ASM_OP "\t.word\t"
+
+/* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
+
+ Same as config/elfos.h but don't mark these section SHF_WRITE since
+ there is no shared library problem. */
+#undef CTORS_SECTION_ASM_OP
+#define CTORS_SECTION_ASM_OP "\t.section\t.ctors,\"a\""
+
+#undef DTORS_SECTION_ASM_OP
+#define DTORS_SECTION_ASM_OP "\t.section\t.dtors,\"a\""
+
+#undef CTORS_SECTION_FUNCTION
+#define CTORS_SECTION_FUNCTION \
+void \
+ctors_section () \
+{ \
+ if (in_section != in_ctors) \
+ { \
+ fprintf (asm_out_file, "\t.globl\t__do_global_ctors\n"); \
+ fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \
+ in_section = in_ctors; \
+ } \
+}
+
+#undef DTORS_SECTION_FUNCTION
+#define DTORS_SECTION_FUNCTION \
+void \
+dtors_section () \
+{ \
+ if (in_section != in_dtors) \
+ { \
+ fprintf (asm_out_file, "\t.globl\t__do_global_dtors\n"); \
+ fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \
+ in_section = in_dtors; \
+ } \
+}
+
/* This is how to begin an assembly language file. Most svr4 assemblers want
at least a .file directive to come first, and some want to see a .version
directive come right after that. Here we just establish a default
_regs_d3_4 _regs_d5_6 _regs_d7_8 _regs_d9_16 _regs_d17_32 \
_premain __exit _abort _cleanup \
_adddi3 _subdi3 _notdi2 \
- _ashrhi3 _lshrhi3 _lshlhi3 _ashrqi3 _lshlqi3 _map_data _init_bss
+ _ashrhi3 _lshrhi3 _lshlhi3 _ashrqi3 _lshlqi3 _map_data _init_bss \
+ _ctor _dtor
TARGET_LIBGCC2_CFLAGS = -DUSE_GAS -DIN_GCC
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