mirror of https://git.tukaani.org/xz.git
Updated the x86 assembler code:
- Use call/ret pair to get instruction pointer for PIC.
- Use PIC only if PIC or __PIC__ is #defined.
- The code should work on MinGW and Darwin in addition
to GNU/Linux and Solaris.
This commit is contained in:
Lasse Collin
parent
22a0c6dd94
commit
99c1c2abfa
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@ -307,12 +307,6 @@ if test "x$enable_assembler" = xyes; then
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x86_64) enable_assembler=x86_64 ;;
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*) enable_assembler=no ;;
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esac
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# Darwin has different ABI than GNU+Linux and Solaris,
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# and the assembler code doesn't assemble.
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case $host_os in
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darwin*) enable_assembler=no ;;
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*) ;;
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esac
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fi
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case $enable_assembler in
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x86)
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@ -44,12 +44,37 @@ init_table(void)
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* extern uint32_t lzma_crc32(const uint8_t *buf, size_t size, uint32_t crc);
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*/
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.text
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.globl lzma_crc32
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.type lzma_crc32, @function
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/*
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* On some systems, the functions need to be prefixed. The prefix is
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* usually an underscore.
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*/
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#ifndef __USER_LABEL_PREFIX__
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# define __USER_LABEL_PREFIX__
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#endif
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#define MAKE_SYM_CAT(prefix, sym) prefix ## sym
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#define MAKE_SYM(prefix, sym) MAKE_SYM_CAT(prefix, sym)
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#define LZMA_CRC32 MAKE_SYM(__USER_LABEL_PREFIX__, lzma_crc32)
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#define LZMA_CRC32_TABLE MAKE_SYM(__USER_LABEL_PREFIX__, lzma_crc32_table)
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.align 16
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lzma_crc32:
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/*
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* Solaris assembler doesn't have .p2align, and Darwin uses .align
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* differently than GNU/Linux and Solaris.
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*/
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#ifdef __MACH__
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# define ALIGN(pow2, abs) .align pow2
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#else
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# define ALIGN(pow2, abs) .align abs
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#endif
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.text
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.globl LZMA_CRC32
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#if !defined(__MACH__) && !defined(_WIN32)
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.type LZMA_CRC32, @function
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#endif
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ALIGN(4, 16)
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LZMA_CRC32:
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/*
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* Register usage:
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* %eax crc
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@ -71,17 +96,32 @@ lzma_crc32:
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/*
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* Store the address of lzma_crc32_table to %ebx. This is needed to
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* get position-independent code (PIC).
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*
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* The PIC macro is defined by libtool, while __PIC__ is defined
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* by GCC but only on some systems. Testing for both makes it simpler
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* to test this code without libtool, and keeps the code working also
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* when built with libtool but using something else than GCC.
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*/
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call .L_PIC
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.L_PIC:
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popl %ebx
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addl $_GLOBAL_OFFSET_TABLE_+[.-.L_PIC], %ebx
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movl lzma_crc32_table@GOT(%ebx), %ebx
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#if !defined(PIC) && !defined(__PIC__)
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/* Not PIC */
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movl $LZMA_CRC32_TABLE, %ebx
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#elif defined(__MACH__)
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/* Mach-O */
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call .L_get_pc
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.L_pic:
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leal .L_lzma_crc32_table$non_lazy_ptr-.L_pic(%ebx), %ebx
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movl (%ebx), %ebx
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#else
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/* ELF */
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call .L_get_pc
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addl $_GLOBAL_OFFSET_TABLE_, %ebx
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movl LZMA_CRC32_TABLE@GOT(%ebx), %ebx
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#endif
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/* Complement the initial value. */
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notl %eax
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.align 16
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ALIGN(4, 16)
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.L_align:
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/*
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* Check if there is enough input to use slicing-by-eight.
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@ -104,7 +144,7 @@ lzma_crc32:
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decl %edi
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jmp .L_align
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.align 4
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ALIGN(2, 4)
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.L_slice:
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/*
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* If we get here, there's at least 16 bytes of aligned input
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@ -214,7 +254,27 @@ lzma_crc32:
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popl %ebx
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ret
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.size lzma_crc32, .-lzma_crc32
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#if defined(PIC) || defined(__PIC__)
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ALIGN(4, 16)
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.L_get_pc:
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movl (%esp), %ebx
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ret
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#endif
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#if defined(__MACH__) && (defined(PIC) || defined(__PIC__))
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.section __IMPORT,__pointers,non_lazy_symbol_pointers
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.L_lzma_crc32_table$non_lazy_ptr:
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.indirect_symbol LZMA_CRC32_TABLE
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.long 0
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#elif defined(_WIN32)
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/* This is equivalent of __declspec(dllexport). */
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.section .drectve
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.ascii " -export:lzma_crc32"
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#else
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.size LZMA_CRC32, .-LZMA_CRC32
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#endif
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/*
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* This is needed to support non-executable stack. It's ugly to
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@ -37,12 +37,37 @@ init_table(void)
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* extern uint64_t lzma_crc64(const uint8_t *buf, size_t size, uint64_t crc);
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*/
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.text
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.globl lzma_crc64
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.type lzma_crc64, @function
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/*
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* On some systems, the functions need to be prefixed. The prefix is
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* usually an underscore.
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*/
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#ifndef __USER_LABEL_PREFIX__
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# define __USER_LABEL_PREFIX__
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#endif
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#define MAKE_SYM_CAT(prefix, sym) prefix ## sym
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#define MAKE_SYM(prefix, sym) MAKE_SYM_CAT(prefix, sym)
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#define LZMA_CRC64 MAKE_SYM(__USER_LABEL_PREFIX__, lzma_crc64)
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#define LZMA_CRC64_TABLE MAKE_SYM(__USER_LABEL_PREFIX__, lzma_crc64_table)
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.align 16
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lzma_crc64:
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/*
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* Solaris assembler doesn't have .p2align, and Darwin uses .align
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* differently than GNU/Linux and Solaris.
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*/
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#ifdef __MACH__
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# define ALIGN(pow2, abs) .align pow2
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#else
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# define ALIGN(pow2, abs) .align abs
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#endif
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.text
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.globl LZMA_CRC64
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#if !defined(__MACH__) && !defined(_WIN32)
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.type LZMA_CRC64, @function
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#endif
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ALIGN(4, 16)
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LZMA_CRC64:
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/*
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* Register usage:
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* %eax crc LSB
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@ -65,12 +90,27 @@ lzma_crc64:
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/*
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* Store the address of lzma_crc64_table to %ebx. This is needed to
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* get position-independent code (PIC).
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*
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* The PIC macro is defined by libtool, while __PIC__ is defined
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* by GCC but only on some systems. Testing for both makes it simpler
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* to test this code without libtool, and keeps the code working also
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* when built with libtool but using something else than GCC.
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*/
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call .L_PIC
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.L_PIC:
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popl %ebx
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addl $_GLOBAL_OFFSET_TABLE_+[.-.L_PIC], %ebx
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movl lzma_crc64_table@GOT(%ebx), %ebx
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#if !defined(PIC) && !defined(__PIC__)
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/* Not PIC */
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movl $LZMA_CRC64_TABLE, %ebx
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#elif defined(__MACH__)
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/* Mach-O */
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call .L_get_pc
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.L_pic:
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leal .L_lzma_crc64_table$non_lazy_ptr-.L_pic(%ebx), %ebx
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movl (%ebx), %ebx
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#else
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/* ELF */
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call .L_get_pc
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addl $_GLOBAL_OFFSET_TABLE_, %ebx
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movl LZMA_CRC64_TABLE@GOT(%ebx), %ebx
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#endif
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/* Complement the initial value. */
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notl %eax
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@ -200,7 +240,29 @@ lzma_crc64:
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popl %ebx
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ret
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.size lzma_crc64, .-lzma_crc64
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#if defined(PIC) || defined(__PIC__)
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ALIGN(4, 16)
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.L_get_pc:
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movl (%esp), %ebx
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ret
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#endif
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#if defined(__MACH__) && (defined(PIC) || defined(__PIC__))
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/* Mach-O PIC */
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.section __IMPORT,__pointers,non_lazy_symbol_pointers
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.L_lzma_crc64_table$non_lazy_ptr:
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.indirect_symbol LZMA_CRC64_TABLE
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.long 0
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#elif defined(_WIN32)
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/* This is equivalent of __declspec(dllexport). */
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.section .drectve
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.ascii " -export:lzma_crc64"
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#else
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/* ELF */
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.size LZMA_CRC64, .-LZMA_CRC64
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#endif
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/*
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* This is needed to support non-executable stack. It's ugly to
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