mirror of
git://git.musl-libc.org/musl
synced 2024-12-15 11:15:07 +00:00
6d99ad91e8
mips32r6 and mips64r6 are actually new isas at both the asm source and opcode levels (pre-r6 code cannot run on r6) and thus need to be treated as a new subarch. the following changes are made, some of which yield code generation improvements for non-r6 targets too: - add subarch logic in configure script and reloc.h files for dynamic linker name. - suppress use of .set mips2 asm directives (used to allow mips2 atomic instructions on baseline mips1 builds; the kernel has to emulate them on mips1) except when actually needed. they cause wrong instruction encodings on r6, and pessimize inlining on at least some compilers. - only hard-code sync instruction encoding on mips1. - use "ZC" constraint instead of "m" constraint for llsc memory operands on r6, where the ll/sc instructions no longer accept full 16-bit offsets. - only hard-code rdhwr instruction encoding with .word on targets (pre-r2) where it may need trap-and-emulate by the kernel. otherwise, just use the instruction mnemonic, and allow an arbitrary destination register to be used.
53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
#include <endian.h>
|
|
|
|
#if __mips_isa_rev >= 6
|
|
#define ISA_SUFFIX "r6"
|
|
#else
|
|
#define ISA_SUFFIX ""
|
|
#endif
|
|
|
|
#if __BYTE_ORDER == __LITTLE_ENDIAN
|
|
#define ENDIAN_SUFFIX "el"
|
|
#else
|
|
#define ENDIAN_SUFFIX ""
|
|
#endif
|
|
|
|
#ifdef __mips_soft_float
|
|
#define FP_SUFFIX "-sf"
|
|
#else
|
|
#define FP_SUFFIX ""
|
|
#endif
|
|
|
|
#define LDSO_ARCH "mips" ISA_SUFFIX ENDIAN_SUFFIX FP_SUFFIX
|
|
|
|
#define TPOFF_K (-0x7000)
|
|
|
|
#define REL_SYM_OR_REL R_MIPS_REL32
|
|
#define REL_PLT R_MIPS_JUMP_SLOT
|
|
#define REL_COPY R_MIPS_COPY
|
|
#define REL_DTPMOD R_MIPS_TLS_DTPMOD32
|
|
#define REL_DTPOFF R_MIPS_TLS_DTPREL32
|
|
#define REL_TPOFF R_MIPS_TLS_TPREL32
|
|
|
|
#define NEED_MIPS_GOT_RELOCS 1
|
|
#define DT_DEBUG_INDIRECT DT_MIPS_RLD_MAP
|
|
#define ARCH_SYM_REJECT_UND(s) (!((s)->st_other & STO_MIPS_PLT))
|
|
|
|
#define CRTJMP(pc,sp) __asm__ __volatile__( \
|
|
"move $sp,%1 ; jr %0" : : "r"(pc), "r"(sp) : "memory" )
|
|
|
|
#define GETFUNCSYM(fp, sym, got) __asm__ ( \
|
|
".hidden " #sym "\n" \
|
|
".set push \n" \
|
|
".set noreorder \n" \
|
|
" bal 1f \n" \
|
|
" nop \n" \
|
|
" .gpword . \n" \
|
|
" .gpword " #sym " \n" \
|
|
"1: lw %0, ($ra) \n" \
|
|
" subu %0, $ra, %0 \n" \
|
|
" lw $ra, 4($ra) \n" \
|
|
" addu %0, %0, $ra \n" \
|
|
".set pop \n" \
|
|
: "=r"(*(fp)) : : "memory", "ra" )
|