![Sam Ravnborg](/assets/img/avatar_default.png)
Building asm-offsets.h has been moved to a seperate Kbuild file located in the top-level directory. This allow us to share the functionality across the architectures. The old rules in architecture specific Makefiles will die in subsequent patches. Furhtermore the usual kbuild dependency tracking is now used when deciding to rebuild asm-offsets.s. So we no longer risk to fail a rebuild caused by asm-offsets.c dependencies being touched. With this common rule-set we now force the same name across all architectures. Following patches will fix the rest. Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
144 lines
4.8 KiB
ArmAsm
144 lines
4.8 KiB
ArmAsm
/*
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* Common code for the sigreturn entry points on the vsyscall page.
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* So far this code is the same for both int80 and sysenter versions.
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* This file is #include'd by vsyscall-*.S to define them after the
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* vsyscall entry point. The kernel assumes that the addresses of these
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* routines are constant for all vsyscall implementations.
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*/
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#include <asm/unistd.h>
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#include <asm/asm-offsets.h>
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/* XXX
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Should these be named "_sigtramp" or something?
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*/
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.text
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.org __kernel_vsyscall+32,0x90
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.globl __kernel_sigreturn
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.type __kernel_sigreturn,@function
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__kernel_sigreturn:
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.LSTART_sigreturn:
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popl %eax /* XXX does this mean it needs unwind info? */
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movl $__NR_sigreturn, %eax
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int $0x80
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.LEND_sigreturn:
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.size __kernel_sigreturn,.-.LSTART_sigreturn
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.balign 32
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.globl __kernel_rt_sigreturn
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.type __kernel_rt_sigreturn,@function
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__kernel_rt_sigreturn:
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.LSTART_rt_sigreturn:
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movl $__NR_rt_sigreturn, %eax
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int $0x80
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.LEND_rt_sigreturn:
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.size __kernel_rt_sigreturn,.-.LSTART_rt_sigreturn
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.balign 32
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.previous
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.section .eh_frame,"a",@progbits
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.LSTARTFRAMEDLSI1:
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.long .LENDCIEDLSI1-.LSTARTCIEDLSI1
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.LSTARTCIEDLSI1:
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.long 0 /* CIE ID */
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.byte 1 /* Version number */
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.string "zR" /* NUL-terminated augmentation string */
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.uleb128 1 /* Code alignment factor */
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.sleb128 -4 /* Data alignment factor */
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.byte 8 /* Return address register column */
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.uleb128 1 /* Augmentation value length */
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.byte 0x1b /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */
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.byte 0 /* DW_CFA_nop */
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.align 4
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.LENDCIEDLSI1:
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.long .LENDFDEDLSI1-.LSTARTFDEDLSI1 /* Length FDE */
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.LSTARTFDEDLSI1:
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.long .LSTARTFDEDLSI1-.LSTARTFRAMEDLSI1 /* CIE pointer */
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/* HACK: The dwarf2 unwind routines will subtract 1 from the
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return address to get an address in the middle of the
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presumed call instruction. Since we didn't get here via
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a call, we need to include the nop before the real start
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to make up for it. */
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.long .LSTART_sigreturn-1-. /* PC-relative start address */
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.long .LEND_sigreturn-.LSTART_sigreturn+1
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.uleb128 0 /* Augmentation */
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/* What follows are the instructions for the table generation.
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We record the locations of each register saved. This is
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complicated by the fact that the "CFA" is always assumed to
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be the value of the stack pointer in the caller. This means
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that we must define the CFA of this body of code to be the
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saved value of the stack pointer in the sigcontext. Which
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also means that there is no fixed relation to the other
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saved registers, which means that we must use DW_CFA_expression
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to compute their addresses. It also means that when we
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adjust the stack with the popl, we have to do it all over again. */
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#define do_cfa_expr(offset) \
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.byte 0x0f; /* DW_CFA_def_cfa_expression */ \
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.uleb128 1f-0f; /* length */ \
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0: .byte 0x74; /* DW_OP_breg4 */ \
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.sleb128 offset; /* offset */ \
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.byte 0x06; /* DW_OP_deref */ \
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1:
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#define do_expr(regno, offset) \
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.byte 0x10; /* DW_CFA_expression */ \
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.uleb128 regno; /* regno */ \
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.uleb128 1f-0f; /* length */ \
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0: .byte 0x74; /* DW_OP_breg4 */ \
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.sleb128 offset; /* offset */ \
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1:
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do_cfa_expr(SIGCONTEXT_esp+4)
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do_expr(0, SIGCONTEXT_eax+4)
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do_expr(1, SIGCONTEXT_ecx+4)
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do_expr(2, SIGCONTEXT_edx+4)
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do_expr(3, SIGCONTEXT_ebx+4)
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do_expr(5, SIGCONTEXT_ebp+4)
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do_expr(6, SIGCONTEXT_esi+4)
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do_expr(7, SIGCONTEXT_edi+4)
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do_expr(8, SIGCONTEXT_eip+4)
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.byte 0x42 /* DW_CFA_advance_loc 2 -- nop; popl eax. */
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do_cfa_expr(SIGCONTEXT_esp)
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do_expr(0, SIGCONTEXT_eax)
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do_expr(1, SIGCONTEXT_ecx)
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do_expr(2, SIGCONTEXT_edx)
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do_expr(3, SIGCONTEXT_ebx)
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do_expr(5, SIGCONTEXT_ebp)
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do_expr(6, SIGCONTEXT_esi)
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do_expr(7, SIGCONTEXT_edi)
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do_expr(8, SIGCONTEXT_eip)
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.align 4
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.LENDFDEDLSI1:
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.long .LENDFDEDLSI2-.LSTARTFDEDLSI2 /* Length FDE */
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.LSTARTFDEDLSI2:
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.long .LSTARTFDEDLSI2-.LSTARTFRAMEDLSI1 /* CIE pointer */
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/* HACK: See above wrt unwind library assumptions. */
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.long .LSTART_rt_sigreturn-1-. /* PC-relative start address */
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.long .LEND_rt_sigreturn-.LSTART_rt_sigreturn+1
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.uleb128 0 /* Augmentation */
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/* What follows are the instructions for the table generation.
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We record the locations of each register saved. This is
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slightly less complicated than the above, since we don't
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modify the stack pointer in the process. */
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do_cfa_expr(RT_SIGFRAME_sigcontext-4 + SIGCONTEXT_esp)
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do_expr(0, RT_SIGFRAME_sigcontext-4 + SIGCONTEXT_eax)
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do_expr(1, RT_SIGFRAME_sigcontext-4 + SIGCONTEXT_ecx)
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do_expr(2, RT_SIGFRAME_sigcontext-4 + SIGCONTEXT_edx)
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do_expr(3, RT_SIGFRAME_sigcontext-4 + SIGCONTEXT_ebx)
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do_expr(5, RT_SIGFRAME_sigcontext-4 + SIGCONTEXT_ebp)
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do_expr(6, RT_SIGFRAME_sigcontext-4 + SIGCONTEXT_esi)
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do_expr(7, RT_SIGFRAME_sigcontext-4 + SIGCONTEXT_edi)
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do_expr(8, RT_SIGFRAME_sigcontext-4 + SIGCONTEXT_eip)
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.align 4
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.LENDFDEDLSI2:
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.previous
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