diff options
Diffstat (limited to 'lib/mlibc/options/internal/x86_64')
| -rw-r--r-- | lib/mlibc/options/internal/x86_64/fenv.S | 102 | ||||
| -rw-r--r-- | lib/mlibc/options/internal/x86_64/mlibc_crtbegin.S | 29 | ||||
| -rw-r--r-- | lib/mlibc/options/internal/x86_64/mlibc_crtend.S | 24 | ||||
| -rw-r--r-- | lib/mlibc/options/internal/x86_64/setjmp.S | 54 |
4 files changed, 209 insertions, 0 deletions
diff --git a/lib/mlibc/options/internal/x86_64/fenv.S b/lib/mlibc/options/internal/x86_64/fenv.S new file mode 100644 index 0000000..3748988 --- /dev/null +++ b/lib/mlibc/options/internal/x86_64/fenv.S @@ -0,0 +1,102 @@ +# The functions below are taken from musl. +.global feclearexcept +.type feclearexcept,@function +feclearexcept: + # maintain exceptions in the sse mxcsr, clear x87 exceptions + mov %edi,%ecx + and $0x3f,%ecx + fnstsw %ax + test %eax,%ecx + jz 1f + fnclex +1: stmxcsr -8(%rsp) + and $0x3f,%eax + or %eax,-8(%rsp) + test %ecx,-8(%rsp) + jz 1f + not %ecx + and %ecx,-8(%rsp) + ldmxcsr -8(%rsp) +1: xor %eax,%eax + ret + +.global feraiseexcept +.type feraiseexcept,@function +feraiseexcept: + and $0x3f,%edi + stmxcsr -8(%rsp) + or %edi,-8(%rsp) + ldmxcsr -8(%rsp) + xor %eax,%eax + ret + +.global __fesetround +.hidden __fesetround +.type __fesetround,@function +__fesetround: + push %rax + xor %eax,%eax + mov %edi,%ecx + fnstcw (%rsp) + andb $0xf3,1(%rsp) + or %ch,1(%rsp) + fldcw (%rsp) + stmxcsr (%rsp) + shl $3,%ch + andb $0x9f,1(%rsp) + or %ch,1(%rsp) + ldmxcsr (%rsp) + pop %rcx + ret + +.global fegetround +.type fegetround,@function +fegetround: + push %rax + stmxcsr (%rsp) + pop %rax + shr $3,%eax + and $0xc00,%eax + ret + +.global fegetenv +.type fegetenv,@function +fegetenv: + xor %eax,%eax + fnstenv (%rdi) + stmxcsr 28(%rdi) + ret + +.global fesetenv +.type fesetenv,@function +fesetenv: + xor %eax,%eax + inc %rdi + jz 1f + fldenv -1(%rdi) + ldmxcsr 27(%rdi) + ret +1: push %rax + push %rax + pushq $0xffff + pushq $0x37f + fldenv (%rsp) + pushq $0x1f80 + ldmxcsr (%rsp) + add $40,%rsp + ret + +.global fetestexcept +.type fetestexcept,@function +fetestexcept: + and $0x3f,%edi + push %rax + stmxcsr (%rsp) + pop %rsi + fnstsw %ax + or %esi,%eax + and %edi,%eax + ret + +.section .note.GNU-stack,"",%progbits + diff --git a/lib/mlibc/options/internal/x86_64/mlibc_crtbegin.S b/lib/mlibc/options/internal/x86_64/mlibc_crtbegin.S new file mode 100644 index 0000000..b99748b --- /dev/null +++ b/lib/mlibc/options/internal/x86_64/mlibc_crtbegin.S @@ -0,0 +1,29 @@ + +.section .data +.hidden __dso_handle +.global __dso_handle +__dso_handle: + .quad __dso_handle + +.section .init +.hidden _init +.global _init +_init: + +.section .fini +.hidden _fini +.global _fini +_fini: + +.section .ctors +.hidden __CTOR_LIST__ +.global __CTOR_LIST__ +__CTOR_LIST__: + +.section .dtors +.hidden __DTOR_LIST__ +.global __DTOR_LIST__ +__DTOR_LIST__: + +.section .note.GNU-stack,"",%progbits + diff --git a/lib/mlibc/options/internal/x86_64/mlibc_crtend.S b/lib/mlibc/options/internal/x86_64/mlibc_crtend.S new file mode 100644 index 0000000..e9d9136 --- /dev/null +++ b/lib/mlibc/options/internal/x86_64/mlibc_crtend.S @@ -0,0 +1,24 @@ + +.hidden __mlibc_do_ctors +.hidden __mlibc_do_dtors + +.section .init + call __mlibc_do_ctors + ret + +.section .fini + call __mlibc_do_dtors + ret + +.section .ctors +.hidden __CTOR_END__ +.global __CTOR_END__ +__CTOR_END__: + +.section .dtors +.hidden __DTOR_END__ +.global __DTOR_END__ +__DTOR_END__: + +.section .note.GNU-stack,"",%progbits + diff --git a/lib/mlibc/options/internal/x86_64/setjmp.S b/lib/mlibc/options/internal/x86_64/setjmp.S new file mode 100644 index 0000000..aa8a134 --- /dev/null +++ b/lib/mlibc/options/internal/x86_64/setjmp.S @@ -0,0 +1,54 @@ + +.type __setjmp, "function" +__setjmp: + mov %rbx, 0x00(%rdi) + mov %rbp, 0x08(%rdi) + mov %r12, 0x10(%rdi) + mov %r13, 0x18(%rdi) + mov %r14, 0x20(%rdi) + mov %r15, 0x28(%rdi) + + lea 8(%rsp), %rax # rsp before return rip is pushed + mov %rax, 0x30(%rdi) + mov (%rsp), %rax # return rip + mov %rax, 0x38(%rdi) + + test %rdx, %rdx + jnz 1f + xor %rax, %rax + ret + +1: + jmp __sigsetjmp + +.global setjmp +.type setjmp, "function" +setjmp: + xor %rdx, %rdx + jmp __setjmp + +.global sigsetjmp +.type sigsetjmp, "function" +sigsetjmp: + mov $1, %rdx + jmp __setjmp + +.global longjmp +.type longjmp, "function" +longjmp: + mov 0x00(%rdi), %rbx + mov 0x08(%rdi), %rbp + mov 0x10(%rdi), %r12 + mov 0x18(%rdi), %r13 + mov 0x20(%rdi), %r14 + mov 0x28(%rdi), %r15 + + mov %rsi, %rax + test %rax, %rax + jnz 1f + inc %rax +1: + mov 0x30(%rdi), %rsp + jmp *0x38(%rdi) +.section .note.GNU-stack,"",%progbits + |