diff options
Diffstat (limited to 'libpthread')
| -rw-r--r-- | libpthread/nptl/sysdeps/unix/sysv/linux/arm/sysdep-cancel.h | 167 |
1 files changed, 142 insertions, 25 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/arm/sysdep-cancel.h b/libpthread/nptl/sysdeps/unix/sysv/linux/arm/sysdep-cancel.h index 423c23195..7ac9ca1e9 100644 --- a/libpthread/nptl/sysdeps/unix/sysv/linux/arm/sysdep-cancel.h +++ b/libpthread/nptl/sysdeps/unix/sysv/linux/arm/sysdep-cancel.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc. +/* Copyright (C) 2003, 2004, 2005, 2009 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -24,6 +24,11 @@ #if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt +/* NOTE: We do mark syscalls with unwind annotations, for the benefit of + cancellation; but they're really only accurate at the point of the + syscall. The ARM unwind directives are not rich enough without adding + a custom personality function. */ + # undef PSEUDO # define PSEUDO(name, syscall_name, args) \ .section ".text"; \ @@ -31,50 +36,158 @@ .type __##syscall_name##_nocancel,%function; \ .globl __##syscall_name##_nocancel; \ __##syscall_name##_nocancel: \ + .cfi_sections .debug_frame; \ + cfi_startproc; \ DO_CALL (syscall_name, args); \ PSEUDO_RET; \ + cfi_endproc; \ .size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel; \ ENTRY (name); \ SINGLE_THREAD_P; \ DOARGS_##args; \ bne .Lpseudo_cancel; \ + cfi_remember_state; \ DO_CALL (syscall_name, 0); \ UNDOARGS_##args; \ cmn r0, $4096; \ PSEUDO_RET; \ + cfi_restore_state; \ .Lpseudo_cancel: \ + .fnstart; \ DOCARGS_##args; /* save syscall args etc. around CENABLE. */ \ CENABLE; \ mov ip, r0; /* put mask in safe place. */ \ UNDOCARGS_##args; /* restore syscall args. */ \ - swi SYS_ify (syscall_name); /* do the call. */ \ - str r0, [sp, $-4]!; /* save syscall return value. */ \ + ldr r7, =SYS_ify (syscall_name); \ + swi 0x0; /* do the call. */ \ + .fnend; /* Past here we can't easily unwind. */ \ + mov r7, r0; /* save syscall return value. */ \ mov r0, ip; /* get mask back. */ \ CDISABLE; \ - ldmfd sp!, {r0, lr}; /* retrieve return value and address. */ \ + mov r0, r7; /* retrieve return value. */ \ + RESTORE_LR_##args; \ UNDOARGS_##args; \ - cmn r0, $4096; - -# define DOCARGS_0 str lr, [sp, #-4]!; + cmn r0, $4096 + +/* DOARGS pushes four bytes on the stack for five arguments, eight bytes for + six arguments, and nothing for fewer. In order to preserve doubleword + alignment, sometimes we must save an extra register. */ + +# define RESTART_UNWIND \ + .fnend; \ + .fnstart; \ + .save {r7, lr} + +# define DOCARGS_0 \ + stmfd sp!, {r7, lr}; \ + cfi_adjust_cfa_offset (8); \ + cfi_rel_offset (r7, 0); \ + cfi_rel_offset (lr, 4); \ + .save {r7, lr} # define UNDOCARGS_0 - -# define DOCARGS_1 stmfd sp!, {r0, lr}; -# define UNDOCARGS_1 ldr r0, [sp], #4; - -# define DOCARGS_2 stmfd sp!, {r0, r1, lr}; -# define UNDOCARGS_2 ldmfd sp!, {r0, r1}; - -# define DOCARGS_3 stmfd sp!, {r0, r1, r2, lr}; -# define UNDOCARGS_3 ldmfd sp!, {r0, r1, r2}; - -# define DOCARGS_4 stmfd sp!, {r0, r1, r2, r3, lr}; -# define UNDOCARGS_4 ldmfd sp!, {r0, r1, r2, r3}; - -# define DOCARGS_5 DOCARGS_4 -# define UNDOCARGS_5 UNDOCARGS_4 - -# define DOCARGS_6 DOCARGS_5 -# define UNDOCARGS_6 UNDOCARGS_5 +# define RESTORE_LR_0 \ + ldmfd sp!, {r7, lr}; \ + cfi_adjust_cfa_offset (-8); \ + cfi_restore (r7); \ + cfi_restore (lr) + +# define DOCARGS_1 \ + stmfd sp!, {r0, r1, r7, lr}; \ + cfi_adjust_cfa_offset (16); \ + cfi_rel_offset (r7, 8); \ + cfi_rel_offset (lr, 12); \ + .save {r7, lr}; \ + .pad #8 +# define UNDOCARGS_1 \ + ldr r0, [sp], #8; \ + cfi_adjust_cfa_offset (-8); \ + RESTART_UNWIND +# define RESTORE_LR_1 \ + RESTORE_LR_0 + +# define DOCARGS_2 \ + stmfd sp!, {r0, r1, r7, lr}; \ + cfi_adjust_cfa_offset (16); \ + cfi_rel_offset (r7, 8); \ + cfi_rel_offset (lr, 12); \ + .save {r7, lr}; \ + .pad #8 +# define UNDOCARGS_2 \ + ldmfd sp!, {r0, r1}; \ + cfi_adjust_cfa_offset (-8); \ + RESTART_UNWIND +# define RESTORE_LR_2 \ + RESTORE_LR_0 + +# define DOCARGS_3 \ + stmfd sp!, {r0, r1, r2, r3, r7, lr}; \ + cfi_adjust_cfa_offset (24); \ + cfi_rel_offset (r7, 16); \ + cfi_rel_offset (lr, 20); \ + .save {r7, lr}; \ + .pad #16 +# define UNDOCARGS_3 \ + ldmfd sp!, {r0, r1, r2, r3}; \ + cfi_adjust_cfa_offset (-16); \ + RESTART_UNWIND +# define RESTORE_LR_3 \ + RESTORE_LR_0 + +# define DOCARGS_4 \ + stmfd sp!, {r0, r1, r2, r3, r7, lr}; \ + cfi_adjust_cfa_offset (24); \ + cfi_rel_offset (r7, 16); \ + cfi_rel_offset (lr, 20); \ + .save {r7, lr}; \ + .pad #16 +# define UNDOCARGS_4 \ + ldmfd sp!, {r0, r1, r2, r3}; \ + cfi_adjust_cfa_offset (-16); \ + RESTART_UNWIND +# define RESTORE_LR_4 \ + RESTORE_LR_0 + +/* r4 is only stmfd'ed for correct stack alignment. */ +# define DOCARGS_5 \ + .save {r4}; \ + stmfd sp!, {r0, r1, r2, r3, r4, r7, lr}; \ + cfi_adjust_cfa_offset (28); \ + cfi_rel_offset (r7, 20); \ + cfi_rel_offset (lr, 24); \ + .save {r7, lr}; \ + .pad #20 +# define UNDOCARGS_5 \ + ldmfd sp!, {r0, r1, r2, r3}; \ + cfi_adjust_cfa_offset (-16); \ + .fnend; \ + .fnstart; \ + .save {r4}; \ + .save {r7, lr}; \ + .pad #4 +# define RESTORE_LR_5 \ + ldmfd sp!, {r4, r7, lr}; \ + cfi_adjust_cfa_offset (-12); \ + /* r4 will be marked as restored later. */ \ + cfi_restore (r7); \ + cfi_restore (lr) + +# define DOCARGS_6 \ + .save {r4, r5}; \ + stmfd sp!, {r0, r1, r2, r3, r7, lr}; \ + cfi_adjust_cfa_offset (24); \ + cfi_rel_offset (r7, 16); \ + cfi_rel_offset (lr, 20); \ + .save {r7, lr}; \ + .pad #16 +# define UNDOCARGS_6 \ + ldmfd sp!, {r0, r1, r2, r3}; \ + cfi_adjust_cfa_offset (-16); \ + .fnend; \ + .fnstart; \ + .save {r4, r5}; \ + .save {r7, lr} +# define RESTORE_LR_6 \ + RESTORE_LR_0 # ifdef IS_IN_libpthread # define CENABLE bl PLTJMP(__pthread_enable_asynccancel) @@ -114,9 +227,13 @@ extern int __local_multiple_threads attribute_hidden; # define PSEUDO_PROLOGUE # define SINGLE_THREAD_P \ stmfd sp!, {r0, lr}; \ + cfi_adjust_cfa_offset (8); \ + cfi_rel_offset (lr, 4); \ bl __aeabi_read_tp; \ ldr ip, [r0, #MULTIPLE_THREADS_OFFSET]; \ ldmfd sp!, {r0, lr}; \ + cfi_adjust_cfa_offset (-8); \ + cfi_restore (lr); \ teq ip, #0 # define SINGLE_THREAD_P_PIC(x) SINGLE_THREAD_P # endif |