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Create ARM unwind records for system call stubs.
This commit is contained in:
Ulrich Weigand
Joseph Myers
parent
2242368302
commit
738860089d
@ -1,3 +1,30 @@
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2011-03-21 Ulrich Weigand <ulrich.weigand@linaro.org>
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* sysdeps/unix/sysv/arm/eabi/sysdep.h (DO_CALL): Do not save/restore
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r7 into IP.
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(DOARGS_0, UNDOARGS_0): Redefine to save/restore r7 to the stack.
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Create appropriate ARM unwind record.
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(DOARGS_1, UNDOARGS_1): Likewise.
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(DOARGS_2, UNDOARGS_2): Likewise.
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(DOARGS_3, UNDOARGS_3): Likewise.
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(DOARGS_4, UNDOARGS_4): Likewise.
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(DOARGS_5, UNDOARGS_5): Likewise.
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(DOARGS_6, UNDOARGS_6): Likewise.
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(DOARGS_7, UNDOARGS_7): Likewise.
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* sysdeps/unix/sysv/arm/eabi/nptl/sysdep-cancel.h (PSEUDO): Adapt to
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DO_CALL/DOARGS_xxx/UNDOARGS_xxx changes.
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(RESTART_UNWIND): Likewise.
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(DOCARGS_0, RESTORE_LR_0): Likewise.
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(DOCARGS_1): Likewise.
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(DOCARGS_2): Likewise.
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(DOCARGS_3): Likewise.
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(DOCARGS_4): Likewise.
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(DOCARGS_5, UNDOCARGS_5, RESTORE_LR_5): Likewise.
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(DOCARGS_6, UNDOCARGS_6): Likewise.
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* sysdeps/unix/sysv/linux/arm/vfork.S (__vfork): Do no use DO_CALL to
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call vfork. In the __ARM_EABI__ case, save r7 both to IP (to restore
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from) and the stack (to create an ARM unwind record).
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2011-03-21 Joseph Myers <joseph@codesourcery.com>
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* sysdeps/arm/eabi/__longjmp.S, sysdeps/arm/eabi/bits/fenv.h,
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@ -47,20 +47,20 @@
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DOARGS_##args; \
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bne .Lpseudo_cancel; \
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cfi_remember_state; \
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DO_CALL (syscall_name, 0); \
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ldr r7, =SYS_ify (syscall_name); \
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swi 0x0; \
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UNDOARGS_##args; \
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cmn r0, $4096; \
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PSEUDO_RET; \
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cfi_restore_state; \
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.Lpseudo_cancel: \
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.fnstart; \
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.fnstart; /* matched by the .fnend in UNDOARGS below. */ \
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DOCARGS_##args; /* save syscall args etc. around CENABLE. */ \
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CENABLE; \
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mov ip, r0; /* put mask in safe place. */ \
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UNDOCARGS_##args; /* restore syscall args. */ \
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ldr r7, =SYS_ify (syscall_name); \
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swi 0x0; /* do the call. */ \
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.fnend; /* Past here we can't easily unwind. */ \
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mov r7, r0; /* save syscall return value. */ \
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mov r0, ip; /* get mask back. */ \
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CDISABLE; \
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@ -69,34 +69,34 @@
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UNDOARGS_##args; \
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cmn r0, $4096
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/* DOARGS pushes four bytes on the stack for five arguments, eight bytes for
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six arguments, and nothing for fewer. In order to preserve doubleword
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/* DOARGS pushes eight bytes on the stack for five arguments, twelve bytes for
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six arguments, and four bytes for fewer. In order to preserve doubleword
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alignment, sometimes we must save an extra register. */
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# define RESTART_UNWIND \
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.fnend; \
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.fnstart; \
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.save {r7, lr}
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.save {r7}; \
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.save {lr}
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# define DOCARGS_0 \
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stmfd sp!, {r7, lr}; \
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cfi_adjust_cfa_offset (8); \
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cfi_rel_offset (r7, 0); \
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cfi_rel_offset (lr, 4); \
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.save {r7, lr}
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.save {r7}; \
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str lr, [sp, #-4]!; \
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cfi_adjust_cfa_offset (4); \
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cfi_rel_offset (lr, 0); \
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.save {lr}
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# define UNDOCARGS_0
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# define RESTORE_LR_0 \
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ldmfd sp!, {r7, lr}; \
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cfi_adjust_cfa_offset (-8); \
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cfi_restore (r7); \
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ldr lr, [sp], #4; \
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cfi_adjust_cfa_offset (-4); \
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cfi_restore (lr)
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# define DOCARGS_1 \
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stmfd sp!, {r0, r1, r7, lr}; \
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cfi_adjust_cfa_offset (16); \
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cfi_rel_offset (r7, 8); \
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cfi_rel_offset (lr, 12); \
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.save {r7, lr}; \
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.save {r7}; \
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stmfd sp!, {r0, r1, lr}; \
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cfi_adjust_cfa_offset (12); \
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cfi_rel_offset (lr, 8); \
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.save {lr}; \
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.pad #8
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# define UNDOCARGS_1 \
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ldr r0, [sp], #8; \
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@ -106,11 +106,11 @@
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RESTORE_LR_0
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# define DOCARGS_2 \
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stmfd sp!, {r0, r1, r7, lr}; \
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cfi_adjust_cfa_offset (16); \
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cfi_rel_offset (r7, 8); \
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cfi_rel_offset (lr, 12); \
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.save {r7, lr}; \
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.save {r7}; \
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stmfd sp!, {r0, r1, lr}; \
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cfi_adjust_cfa_offset (12); \
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cfi_rel_offset (lr, 8); \
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.save {lr}; \
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.pad #8
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# define UNDOCARGS_2 \
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ldmfd sp!, {r0, r1}; \
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@ -120,11 +120,11 @@
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RESTORE_LR_0
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# define DOCARGS_3 \
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stmfd sp!, {r0, r1, r2, r3, r7, lr}; \
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cfi_adjust_cfa_offset (24); \
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cfi_rel_offset (r7, 16); \
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cfi_rel_offset (lr, 20); \
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.save {r7, lr}; \
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.save {r7}; \
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stmfd sp!, {r0, r1, r2, r3, lr}; \
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cfi_adjust_cfa_offset (20); \
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cfi_rel_offset (lr, 16); \
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.save {lr}; \
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.pad #16
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# define UNDOCARGS_3 \
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ldmfd sp!, {r0, r1, r2, r3}; \
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@ -134,11 +134,11 @@
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RESTORE_LR_0
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# define DOCARGS_4 \
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stmfd sp!, {r0, r1, r2, r3, r7, lr}; \
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cfi_adjust_cfa_offset (24); \
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cfi_rel_offset (r7, 16); \
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cfi_rel_offset (lr, 20); \
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.save {r7, lr}; \
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.save {r7}; \
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stmfd sp!, {r0, r1, r2, r3, lr}; \
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cfi_adjust_cfa_offset (20); \
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cfi_rel_offset (lr, 16); \
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.save {lr}; \
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.pad #16
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# define UNDOCARGS_4 \
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ldmfd sp!, {r0, r1, r2, r3}; \
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@ -149,43 +149,40 @@
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/* r4 is only stmfd'ed for correct stack alignment. */
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# define DOCARGS_5 \
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.save {r4}; \
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stmfd sp!, {r0, r1, r2, r3, r4, r7, lr}; \
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cfi_adjust_cfa_offset (28); \
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cfi_rel_offset (r7, 20); \
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cfi_rel_offset (lr, 24); \
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.save {r7, lr}; \
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.save {r4, r7}; \
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stmfd sp!, {r0, r1, r2, r3, r4, lr}; \
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cfi_adjust_cfa_offset (24); \
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cfi_rel_offset (lr, 20); \
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.save {lr}; \
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.pad #20
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# define UNDOCARGS_5 \
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ldmfd sp!, {r0, r1, r2, r3}; \
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cfi_adjust_cfa_offset (-16); \
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.fnend; \
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.fnstart; \
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.save {r4}; \
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.save {r7, lr}; \
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.save {r4, r7}; \
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.save {lr}; \
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.pad #4
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# define RESTORE_LR_5 \
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ldmfd sp!, {r4, r7, lr}; \
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cfi_adjust_cfa_offset (-12); \
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ldmfd sp!, {r4, lr}; \
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cfi_adjust_cfa_offset (-8); \
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/* r4 will be marked as restored later. */ \
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cfi_restore (r7); \
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cfi_restore (lr)
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# define DOCARGS_6 \
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.save {r4, r5}; \
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stmfd sp!, {r0, r1, r2, r3, r7, lr}; \
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cfi_adjust_cfa_offset (24); \
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cfi_rel_offset (r7, 16); \
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cfi_rel_offset (lr, 20); \
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.save {r7, lr}; \
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.save {r4, r5, r7}; \
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stmfd sp!, {r0, r1, r2, r3, lr}; \
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cfi_adjust_cfa_offset (20); \
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cfi_rel_offset (lr, 16); \
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.save {lr}; \
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.pad #16
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# define UNDOCARGS_6 \
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ldmfd sp!, {r0, r1, r2, r3}; \
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cfi_adjust_cfa_offset (-16); \
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.fnend; \
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.fnstart; \
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.save {r4, r5}; \
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.save {r7, lr}
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.save {r4, r5, r7}; \
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.save {lr};
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# define RESTORE_LR_6 \
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RESTORE_LR_0
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@ -106,12 +106,95 @@
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#undef DO_CALL
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#define DO_CALL(syscall_name, args) \
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DOARGS_##args; \
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mov ip, r7; \
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cfi_register (r7, ip); \
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ldr r7, =SYS_ify (syscall_name); \
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swi 0x0; \
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mov r7, ip; \
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cfi_restore (r7); \
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UNDOARGS_##args
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#undef DOARGS_0
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#define DOARGS_0 \
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.fnstart; \
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str r7, [sp, #-4]!; \
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cfi_adjust_cfa_offset (4); \
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cfi_rel_offset (r7, 0); \
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.save { r7 }
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#undef DOARGS_1
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#define DOARGS_1 DOARGS_0
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#undef DOARGS_2
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#define DOARGS_2 DOARGS_0
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#undef DOARGS_3
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#define DOARGS_3 DOARGS_0
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#undef DOARGS_4
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#define DOARGS_4 DOARGS_0
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#undef DOARGS_5
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#define DOARGS_5 \
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.fnstart; \
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stmfd sp!, {r4, r7}; \
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cfi_adjust_cfa_offset (8); \
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cfi_rel_offset (r4, 0); \
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cfi_rel_offset (r7, 4); \
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.save { r4, r7 }; \
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ldr r4, [sp, #8]
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#undef DOARGS_6
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#define DOARGS_6 \
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.fnstart; \
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mov ip, sp; \
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stmfd sp!, {r4, r5, r7}; \
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cfi_adjust_cfa_offset (12); \
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cfi_rel_offset (r4, 0); \
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cfi_rel_offset (r5, 4); \
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cfi_rel_offset (r7, 8); \
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.save { r4, r5, r7 }; \
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ldmia ip, {r4, r5}
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#undef DOARGS_7
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#define DOARGS_7 \
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.fnstart; \
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mov ip, sp; \
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stmfd sp!, {r4, r5, r6, r7}; \
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cfi_adjust_cfa_offset (16); \
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cfi_rel_offset (r4, 0); \
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cfi_rel_offset (r5, 4); \
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cfi_rel_offset (r6, 8); \
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cfi_rel_offset (r7, 12); \
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.save { r4, r5, r6, r7 }; \
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ldmia ip, {r4, r5, r6}
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#undef UNDOARGS_0
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#define UNDOARGS_0 \
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ldr r7, [sp], #4; \
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cfi_adjust_cfa_offset (-4); \
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cfi_restore (r7); \
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.fnend
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#undef UNDOARGS_1
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#define UNDOARGS_1 UNDOARGS_0
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#undef UNDOARGS_2
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#define UNDOARGS_2 UNDOARGS_0
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#undef UNDOARGS_3
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#define UNDOARGS_3 UNDOARGS_0
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#undef UNDOARGS_4
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#define UNDOARGS_4 UNDOARGS_0
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#undef UNDOARGS_5
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#define UNDOARGS_5 \
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ldmfd sp!, {r4, r7}; \
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cfi_adjust_cfa_offset (-8); \
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cfi_restore (r4); \
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cfi_restore (r7); \
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.fnend
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#undef UNDOARGS_6
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#define UNDOARGS_6 \
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ldmfd sp!, {r4, r5, r7}; \
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cfi_adjust_cfa_offset (-12); \
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cfi_restore (r4); \
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cfi_restore (r5); \
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cfi_restore (r7); \
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.fnend
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#undef UNDOARGS_7
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#define UNDOARGS_7 \
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ldmfd sp!, {r4, r5, r6, r7}; \
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cfi_adjust_cfa_offset (-16); \
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cfi_restore (r4); \
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cfi_restore (r5); \
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cfi_restore (r6); \
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cfi_restore (r7); \
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.fnend
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#endif /* _LINUX_ARM_EABI_SYSDEP_H */
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@ -33,7 +33,28 @@ ENTRY (__vfork)
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#ifdef SAVE_PID
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SAVE_PID
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#endif
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DO_CALL (vfork, 0)
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#ifdef __ARM_EABI__
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/* The DO_CALL macro saves r7 on the stack, to enable generation
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of ARM unwind info. Since the stack is initially shared between
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parent and child of vfork, that saved value could be corrupted.
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To avoid this problem, we save r7 into ip as well, and restore
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from there. */
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mov ip, r7
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cfi_register (r7, ip)
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.fnstart
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str r7, [sp, #-4]!
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cfi_adjust_cfa_offset (4)
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.save { r7 }
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ldr r7, =SYS_ify (vfork)
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swi 0x0
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.fnend
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add sp, sp, #4
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cfi_adjust_cfa_offset (-4)
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mov r7, ip
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cfi_restore (r7);
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#else
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swi SYS_ify(vfork)
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#endif
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#ifdef RESTORE_PID
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RESTORE_PID
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#endif
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