9:08 a.m.
To make it easier to test 32 bit Arm softmmu issues implement a basic
boot.S so we can build the multiarch tests. Currently CHECK_UNALIGNED
is disabled as I haven't got the right magic set for it to work.
Message-Id: <20231115205542.3092038-10-alex.bennee(a)linaro.org>
Signed-off-by: Alex Bennée <alex.bennee(a)linaro.org>
---
v2
- use endf macro for global function symbols in boot.S
---
tests/tcg/arm/Makefile.softmmu-target | 64 +++++-
tests/tcg/arm/system/boot.S | 301 ++++++++++++++++++++++++++
tests/tcg/arm/system/kernel.ld | 24 ++
3 files changed, 379 insertions(+), 10 deletions(-)
create mode 100644 tests/tcg/arm/system/boot.S
create mode 100644 tests/tcg/arm/system/kernel.ld
diff --git a/tests/tcg/arm/Makefile.softmmu-target
b/tests/tcg/arm/Makefile.softmmu-target
index 7857ab9324..aadc12767e 100644
--- a/tests/tcg/arm/Makefile.softmmu-target
+++ b/tests/tcg/arm/Makefile.softmmu-target
@@ -8,20 +8,64 @@ ARM_SRC=$(SRC_PATH)/tests/tcg/arm/system
# Set search path for all sources
VPATH += $(ARM_SRC)
-ARM_TESTS=test-armv6m-undef
+# Specific Test Rules
-TESTS += $(ARM_TESTS)
+test-armv6m-undef: test-armv6m-undef.S
+ $(CC) -mcpu=cortex-m0 -mfloat-abi=soft \
+ -Wl,--build-id=none -x assembler-with-cpp \
+ $< -o $@ -nostdlib -N -static \
+ -T $(ARM_SRC)/$@.ld
-LDFLAGS+=-nostdlib -N -static
+run-test-armv6m-undef: QEMU_OPTS+=-semihosting -M microbit -kernel
-%: %.S %.ld
- $(CC) $(CFLAGS) $(ASFLAGS) $(EXTRA_CFLAGS) $< -o $@ $(LDFLAGS) -T $(ARM_SRC)/$@.ld
+ARM_TESTS+=test-armv6m-undef
-# Specific Test Rules
+# These objects provide the basic boot code and helper functions for all tests
+CRT_OBJS=boot.o
-test-armv6m-undef: EXTRA_CFLAGS+=-mcpu=cortex-m0 -mfloat-abi=soft -Wl,--build-id=none -x
assembler-with-cpp
+ARM_TEST_SRCS=$(wildcard $(ARM_SRC)/*.c)
+ARM_TESTS+=$(patsubst $(ARM_SRC)/%.c, %, $(ARM_TEST_SRCS))
-run-test-armv6m-undef: QEMU_OPTS+=-semihosting -M microbit -kernel
+CRT_PATH=$(ARM_SRC)
+LINK_SCRIPT=$(ARM_SRC)/kernel.ld
+LDFLAGS=-Wl,-T$(LINK_SCRIPT)
+CFLAGS+=-nostdlib -ggdb -O0 $(MINILIB_INC)
+LDFLAGS+=-static -nostdlib -N $(CRT_OBJS) $(MINILIB_OBJS) -lgcc
+
+# building head blobs
+.PRECIOUS: $(CRT_OBJS)
+
+%.o: $(ARM_SRC)/%.S
+ $(CC) $(CFLAGS) $(EXTRA_CFLAGS) -x assembler-with-cpp -c $< -o $@
+
+# Build and link the tests
+%: %.c $(LINK_SCRIPT) $(CRT_OBJS) $(MINILIB_OBJS)
+ $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $< -o $@ $(LDFLAGS)
+
+memory: CFLAGS+=-DCHECK_UNALIGNED=0
+
+# Running
+QEMU_BASE_MACHINE=-M virt -cpu max -display none
+QEMU_OPTS+=$(QEMU_BASE_MACHINE) -semihosting-config
enable=on,target=native,chardev=output -kernel
+
+# Simple Record/Replay Test
+.PHONY: memory-record
+run-memory-record: memory-record memory
+ $(call run-test, $<, \
+ $(QEMU) -monitor none -display none \
+ -chardev file$(COMMA)path=$<.out$(COMMA)id=output \
+ -icount shift=5$(COMMA)rr=record$(COMMA)rrfile=record.bin \
+ $(QEMU_OPTS) memory)
+
+.PHONY: memory-replay
+run-memory-replay: memory-replay run-memory-record
+ $(call run-test, $<, \
+ $(QEMU) -monitor none -display none \
+ -chardev file$(COMMA)path=$<.out$(COMMA)id=output \
+ -icount shift=5$(COMMA)rr=replay$(COMMA)rrfile=record.bin \
+ $(QEMU_OPTS) memory)
+
+EXTRA_RUNS+=run-memory-replay
-# We don't currently support the multiarch system tests
-undefine MULTIARCH_TESTS
+TESTS += $(ARM_TESTS) $(MULTIARCH_TESTS)
+EXTRA_RUNS+=$(MULTIARCH_RUNS)
diff --git a/tests/tcg/arm/system/boot.S b/tests/tcg/arm/system/boot.S
new file mode 100644
index 0000000000..7915502ae4
--- /dev/null
+++ b/tests/tcg/arm/system/boot.S
@@ -0,0 +1,301 @@
+/*
+ * Minimal ArmV7 system boot code.
+ *
+ * Using semihosting for serial output and exit functions.
+ */
+
+/*
+ * Semihosting interface on ARM AArch32
+ * R0 - semihosting call number
+ * R1 - semihosting parameter
+ */
+#define semihosting_call svc 0x123456
+#define SYS_WRITEC 0x03 /* character to debug channel */
+#define SYS_WRITE0 0x04 /* string to debug channel */
+#define SYS_EXIT 0x18
+
+#define ADP_Stopped_ApplicationExit 0x20026
+#define ADP_Stopped_InternalError 0x20024
+
+/*
+ * Helper macro for the linker calling subroutines from the C code.
+ */
+.macro endf name
+ .global \name
+ .type \name, %function
+ .size \name, . - \name
+.endm
+
+ .section .interrupt_vector, "ax"
+ .align 5
+
+vector_table:
+ b reset /* reset vector */
+ b undef_instr /* undefined instruction vector */
+ b software_intr /* software interrupt vector */
+ b prefetch_abort /* prefetch abort vector */
+ b data_abort /* data abort vector */
+ nop /* reserved */
+ b IRQ_handler /* IRQ vector */
+ b FIQ_handler /* FIQ vector */
+
+ .text
+__start:
+ ldr r0, =vector_table
+ mcr p15, 0, r0, c12, c0, 0 /* Set up VBAR */
+
+ ldr sp, =stack_end /* Set up the stack */
+ bl mmu_setup /* Set up the MMU */
+ bl main /* Jump to main */
+
+endf __start
+
+_exit:
+ cmp r0, #0
+ ite EQ // if-then-else. "EQ" is for if equal, else otherwise
+ ldreq r1, =ADP_Stopped_ApplicationExit // if r0 == 0
+ ldrne r1, =ADP_Stopped_InternalError // else
+ mov r0, #SYS_EXIT
+ semihosting_call
+
+endf _exit
+
+ /*
+ * Helper Functions
+ */
+
+mmu_setup:
+ /*
+ * The MMU setup for this is very simple using two stage one
+ * translations. The first 1Mb section points to the text
+ * section and the second points to the data and rss.
+ * Currently the fattest test only needs ~50k for that so we
+ * have plenty of space.
+ *
+ * The short descriptor Section format is as follows:
+ *
+ * PA[31:20] - Section Base Address
+ * NS[19] - Non-secure bit
+ * 0[18] - Section (1 for Super Section)
+ * nG[17] - Not global bit
+ * S[16] - Shareable
+ * TEX[14:12] - Memory Region Attributes
+ * AP[15, 11:10] - Access Permission Bits
+ * IMPDEF[9]
+ * Domain[8:5]
+ * XN[4] - Execute never bit
+ * C[3] - Memory Region Attributes
+ * B[2] - Memory Region Attributes
+ * 1[1]
+ * PXN[0] - Privileged Execute Never
+ *
+ * r0 - point at the table
+ * r1 - address
+ * r2 - entry
+ * r3 - common section bits
+ * r4 - scratch
+ */
+
+ /*
+ * Memory Region Bits
+ *
+ * TEX[14:12] = 000
+ * C[3] = 1
+ * B[2] = 1
+ *
+ * Outer and Inner WB, no write allocate
+ */
+ mov r3, #0
+ ldr r4, =(3 << 2)
+ orr r3, r4, r4
+
+ /* Section bit */
+ orr r3, r3, #2
+
+ /* Page table setup (identity mapping). */
+ ldr r0, =ttb
+
+ /* First block: .text/RO/execute enabled */
+ ldr r1, =.text
+ ldr r2, =0xFFF00000 /* 1MB block alignment */
+ and r2, r1, r2
+ orr r2, r2, r3 /* common bits */
+ orr r2, r2, #(1 << 15) /* AP[2] = 1 */
+ orr r2, r2, #(1 << 10) /* AP[0] = 1 => RO @ PL1 */
+
+ lsr r4, r2, #(20 - 2)
+ str r2, [r0, r4, lsl #0] /* write entry */
+
+ /* Second block: .data/RW/no execute */
+ ldr r1, =.data
+ ldr r2, =0xFFF00000 /* 1MB block alignment */
+ and r2, r1, r2
+ orr r2, r2, r3 /* common bits */
+ orr r2, r2, #(1 << 10) /* AP[0] = 1 => RW @ PL1 */
+ orr r2, r2, #(1 << 4) /* XN[4] => no execute */
+
+ lsr r4, r2, #(20 - 2)
+ str r2, [r0, r4, lsl #0] /* write entry */
+
+ /*
+ * DACR - Domain Control
+ *
+ * Enable client mode for domain 0 (we don't use any others)
+ */
+ ldr r0, =0x1
+ mcr p15, 0, r0, c3, c0, 0
+
+ /*
+ * TTCBR - Translation Table Base Control Register
+ *
+ * EAE[31] = 0, 32-bit translation, short descriptor format
+ * N[2:0] = 5 ( TTBRO uses 31:14-5 => 9 bit lookup stage )
+ */
+ ldr r0, =0x5
+ mcr p15, 0, r0, c1, c0, 2
+
+ /*
+ * TTBR0 -Translation Table Base Register 0
+ *
+ * [31:9] = Base address of table
+ *
+ * QEMU doesn't really care about the cache sharing
+ * attributes so we don't need to either.
+ */
+ ldr r0, =ttb
+ mcr p15, 0, r0, c2, c0, 0
+
+ /*
+ * SCTLR- System Control Register
+ *
+ * TE[30] = 0, exceptions to A32 state
+ * AFE[29] = 0, AP[0] is the access permissions bit
+ * EE[25] = 0, Little-endian
+ * WXN[19] = 0 = no effect, Write does not imply XN (execute never)
+ * I[12] = Instruction cachability control
+ * C[2] = Data cachability control
+ * M[0] = 1, enable stage 1 address translation for EL0/1
+ *
+ * At this point virtual memory is enabled.
+ */
+ ldr r0, =0x1005
+ mcr p15, 0, r0, c1, c0, 0
+
+ isb
+
+ mov pc, lr /* done, return to caller */
+
+/* Output a single character to serial port */
+__sys_outc:
+ STMFD sp!, {r0-r1} // push r0, r1 onto stack
+ mov r1, sp
+ mov r0, #SYS_WRITEC
+ semihosting_call
+ LDMFD sp!, {r0-r1} // pop r0, r1 from stack
+ bx lr
+
+endf __sys_outc
+
+reset:
+ ldr r1, =reset_error
+ b exception_handler
+
+undef_instr:
+ ldr r1, =undef_intr_error
+ b exception_handler
+
+software_intr:
+ ldr r1, =software_intr_error
+ b exception_handler
+
+prefetch_abort:
+ ldr r1, =prefetch_abort_error
+ b exception_handler
+
+data_abort:
+ ldr r1, =data_abort_error
+ b exception_handler
+
+IRQ_handler:
+ ldr r1, =irq_error
+ b exception_handler
+
+FIQ_handler:
+ ldr r1, =fiq_error
+ b exception_handler
+
+/*
+ * Initiate a exit semihosting call whenever there is any exception
+ * r1 already holds the string.
+ */
+exception_handler:
+ mov r0, #SYS_WRITE0
+ semihosting_call
+ mov r0, #SYS_EXIT
+ mov r1, #1
+ semihosting_call
+
+endf exception_handler
+
+/*
+ * We implement a stub raise() function which errors out as tests
+ * shouldn't trigger maths errors.
+ */
+ .global raise
+raise:
+ mov r0, #SYS_WRITE0
+ ldr r1, =maths_error
+ semihosting_call
+ mov r0, #SYS_EXIT
+ ldr r1, =ADP_Stopped_InternalError
+ semihosting_call
+
+endf raise
+
+ .data
+
+.data
+
+reset_error:
+ .ascii "Reset exception occurred.\n\0"
+
+undef_intr_error:
+ .ascii "Undefined Instruction Exception Occurred.\n\0"
+
+software_intr_error:
+ .ascii "Software Interrupt Occurred.\n\0"
+
+prefetch_abort_error:
+ .ascii "Prefetch Abort Occurred.\n\0"
+
+data_abort_error:
+ .ascii "Data Abort Occurred.\n\0"
+
+irq_error:
+ .ascii "IRQ exception occurred.\n\0"
+
+fiq_error:
+ .ascii "FIQ exception occurred.\n\0"
+
+maths_error:
+ .ascii "Software maths exception.\n\0"
+
+
+ /*
+ * 1st Stage Translation table
+ * 4096 entries, indexed by [31:20]
+ * each entry covers 1Mb of address space
+ * aligned on 16kb
+ */
+ .align 15
+ttb:
+ .space (4096 * 4), 0
+
+ .align 12
+
+ /* Space for stack */
+ .align 5
+ .section .bss
+stack:
+ .space 65536, 0
+stack_end:
diff --git a/tests/tcg/arm/system/kernel.ld b/tests/tcg/arm/system/kernel.ld
new file mode 100644
index 0000000000..7b3a76dcbf
--- /dev/null
+++ b/tests/tcg/arm/system/kernel.ld
@@ -0,0 +1,24 @@
+ENTRY(__start)
+
+SECTIONS
+{
+ /* virt machine, RAM starts at 1gb */
+ . = (1 << 30);
+ .text : {
+ *(.text)
+ }
+ .rodata : {
+ *(.rodata)
+ }
+ /* align r/w section to next 2mb */
+ . = ALIGN(1 << 21);
+ .data : {
+ *(.data)
+ }
+ .bss : {
+ *(.bss)
+ }
+ /DISCARD/ : {
+ *(.ARM.attributes)
+ }
+}
--
2.39.2