lib: Add mlibc

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 53 insertions, 0 deletions

diff --git a/lib/mlibc/options/internal/x86/setjmp.S b/lib/mlibc/options/internal/x86/setjmp.S
new file mode 100644
index 0000000..fa6644c
--- /dev/null
+++ b/lib/mlibc/options/internal/x86/setjmp.S
@@ -0,0 +1,53 @@
+
+.type __setjmp, "function"
+__setjmp:
+	mov 4(%esp), %eax       # Save argument (buffer) in edi
+	mov %ebx, 0x00(%eax)
+	mov %ebp, 0x04(%eax)
+	mov %esi, 0x08(%eax)
+	mov %edi, 0x0c(%eax)
+
+	lea 4(%esp), %ecx       # esp before return eip is pushed
+	mov %ecx, 0x10(%eax)
+	mov (%esp), %ecx        # Return eip
+	mov %ecx, 0x14(%eax)
+
+	test %edx, %edx
+	jnz 1f
+	xor %eax, %eax
+	ret
+
+1:
+	jmp __sigsetjmp@PLT
+
+.global setjmp
+.type setjmp, "function"
+setjmp:
+	xor %edx, %edx
+	jmp __setjmp
+
+.global sigsetjmp
+.type sigsetjmp, "function"
+sigsetjmp:
+	mov $1, %edx
+	jmp __setjmp
+
+.global longjmp
+.type longjmp, "function"
+longjmp:
+	mov 4(%esp), %ecx
+	mov 0x00(%ecx), %ebx
+	mov 0x04(%ecx), %ebp
+	mov 0x08(%ecx), %esi
+	mov 0x0c(%ecx), %edi
+
+	mov 8(%esp), %eax
+	test %eax, %eax
+	jnz 1f
+	inc %eax
+1:
+	mov 0x10(%ecx), %esp
+	jmp *0x14(%ecx)
+
+.section .note.GNU-stack,"",%progbits
+