ExecutionEngine: add preliminary support for COFF ARM

This adds rudimentary support for COFF ARM to the dynamic loader for the
exeuction engine.  This can be used by lldb to JIT code into a COFF ARM
environment.  This lays the foundation for the loader, though a few of the
relocation types are yet unhandled.

llvm-svn: 273682

1 files changed, 107 insertions, 0 deletions

diff --git a/llvm/test/ExecutionEngine/RuntimeDyld/ARM/COFF_Thumb.s b/llvm/test/ExecutionEngine/RuntimeDyld/ARM/COFF_Thumb.s
new file mode 100644
index 00000000000..2a128124d0d
--- /dev/null
+++ b/llvm/test/ExecutionEngine/RuntimeDyld/ARM/COFF_Thumb.s
@@ -0,0 +1,107 @@
+// RUN: llvm-mc -triple thumbv7-windows-itanium -filetype obj -o %t.obj %s
+// RUN: llvm-rtdyld -triple thumbv7-windows -dummy-extern OutputDebugStringA=0x78563412 -dummy-extern ExitProcess=0x54769890 -dummy-extern unnamed_addr=0x00001024 -verify -check %s %t.obj
+
+	.text
+	.syntax unified
+
+	.def unnamed_addr
+		.scl 2
+		.type 32
+	.endef
+	.global unnamed_addr
+
+	.def branch24t
+		.scl 2
+		.type 32
+	.endef
+	.global branch24t
+	.p2align 1
+	.code 16
+	.thumb_func
+branch24t:
+@ rel1:
+#	b unnamed_addr					@ IMAGE_REL_ARM_BRANCH24T
+
+	.def function
+		.scl 2
+		.type 32
+	.endef
+	.globl function
+	.p2align 1
+	.code 16
+	.thumb_func
+function:
+	push.w {r11, lr}
+	mov r11, sp
+rel2:							@ IMAGE_REL_ARM_MOV32T
+	movw r0, :lower16:__imp_OutputDebugStringA
+# rtdyld-check: decode_operand(rel2, 1) = (__imp_OutputDebugStringA&0x0000ffff)
+	movt r0, :upper16:__imp_OutputDebugStringA
+# TODO rtdyld-check: decode_operand(rel2, 1) = (__imp_OutputDebugStringA&0xffff0000>>16)
+	ldr r1, [r0]
+rel3:							@ IMAGE_REL_ARM_MOV32T
+	movw r0, :lower16:string
+# rtdyld-check: decode_operand(rel3, 1) = (string&0x0000ffff)
+	movt r0, :upper16:string
+# TODO rtdyld-check: decode_operand(rel3, 1) = (string&0xffff0000>>16)
+	blx r1
+rel4:							@ IMAGE_REL_ARM_MOV32T
+	movw r0, :lower16:__imp_ExitProcess
+# rtdyld-check: decode_operand(rel4, 1) = (__imp_ExitProcess&0x0000ffff)
+	movt r0, :upper16:__imp_ExitProcess
+# TODO rtdyld-check: decode_operand(rel4, 1) = (__imp_ExitProcess&0xffff0000>>16)
+	ldr r1, [r0]
+	movs r0, #0
+	pop.w {r11, lr}
+	bx r1
+
+	.def main
+		.scl 2
+		.type 32
+	.endef
+	.globl main
+	.p2align 1
+	.code 16
+	.thumb_func
+main:
+	push.w {r11, lr}
+	mov r11, sp
+rel5:
+#	bl function					@ IMAGE_REL_ARM_BLX23T
+	movs r0, #0
+	pop.w {r11, pc}
+
+	.section .rdata,"dr"
+	.global string
+string:
+	.asciz "Hello World\n"
+
+	.data
+
+	.p2align 2
+__imp_OutputDebugStringA:
+@ rel6:
+	.long OutputDebugStringA			@ IMAGE_REL_ARM_ADDR32
+# rtdyld-check: *{4}__imp_OutputDebugStringA = 0x78563412
+
+	.p2align 2
+__imp_ExitProcess:
+@ rel7:
+	.long ExitProcess				@ IMAGE_REL_ARM_ADDR32
+# rtdyld-check: *{4}__imp_ExitProcess = 0x54769890
+
+	.global relocations
+relocations:
+@ rel8:
+	.long function(imgrel)				@ IMAGE_REL_ARM_ADDR32NB
+# rtdyld-check: *{4}relocations = function - section_addr(COFF_Thumb.s.tmp.obj, .text)
+rel9:
+	.secidx __imp_OutputDebugStringA		@ IMAGE_REL_ARM_SECTION
+# rtdyld-check: *{2}rel9 = 1
+rel10:
+	.long relocations(secrel32)			@ IMAGE_REL_ARM_SECREL
+# rtdyld-check: *{4}rel10 = relocations - section_addr(COFF_Thumb.s.tmp.obj, .data)
+rel11:
+	.secrel32 relocations				@ IMAGE_REL_ARM_SECREL
+# rtdyld-check: *{4}rel11 = relocations - section_addr(COFF_Thumb.s.tmp.obj, .data)
+