From: Richard Henderson <richard.hender...@linaro.org>
This provides the bootstrap and low level helper functions for an
alpha kernel. We use direct access to the DP264 serial port for
test output, and hard machine halt to exit the emulation.
Signed-off-by: Richard Henderson <richard.hender...@linaro.org>
Message-Id: <20190501184306.15208-1-richard.hender...@linaro.org>
Signed-off-by: Alex Bennée <alex.ben...@linaro.org>
---
MAINTAINERS | 1 +
tests/tcg/alpha/Makefile.softmmu-target | 34 ++
tests/tcg/alpha/system/boot.S | 511 ++++++++++++++++++++++++
tests/tcg/alpha/system/kernel.ld | 30 ++
4 files changed, 576 insertions(+)
create mode 100644 tests/tcg/alpha/Makefile.softmmu-target
create mode 100644 tests/tcg/alpha/system/boot.S
create mode 100644 tests/tcg/alpha/system/kernel.ld
diff --git a/MAINTAINERS b/MAINTAINERS
index c4f209898a9..546a1431ea3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -470,6 +470,7 @@ M: Richard Henderson <r...@twiddle.net>
S: Maintained
F: hw/alpha/
F: hw/isa/smc37c669-superio.c
+F: tests/tcg/alpha/system/
ARM Machines
------------
diff --git a/tests/tcg/alpha/Makefile.softmmu-target
b/tests/tcg/alpha/Makefile.softmmu-target
new file mode 100644
index 00000000000..3c0f34cc692
--- /dev/null
+++ b/tests/tcg/alpha/Makefile.softmmu-target
@@ -0,0 +1,34 @@
+#
+# Alpha system tests
+#
+
+ALPHA_SYSTEM_SRC=$(SRC_PATH)/tests/tcg/alpha/system
+VPATH+=$(ALPHA_SYSTEM_SRC)
+
+# These objects provide the basic boot code and helper functions for all tests
+CRT_OBJS=boot.o
+
+ALPHA_TEST_SRCS=$(wildcard $(ALPHA_SYSTEM_SRC)/*.c)
+ALPHA_TESTS = $(patsubst $(ALPHA_SYSTEM_SRC)/%.c, %, $(ALPHA_TEST_SRCS))
+
+CRT_PATH=$(ALPHA_SYSTEM_SRC)
+LINK_SCRIPT=$(ALPHA_SYSTEM_SRC)/kernel.ld
+LDFLAGS=-Wl,-T$(LINK_SCRIPT)
+TESTS+=$(ALPHA_TESTS) $(MULTIARCH_TESTS)
+CFLAGS+=-nostdlib -g -O1 -mcpu=ev6 $(MINILIB_INC)
+LDFLAGS+=-static -nostdlib $(CRT_OBJS) $(MINILIB_OBJS) -lgcc
+
+# building head blobs
+.PRECIOUS: $(CRT_OBJS)
+
+%.o: $(CRT_PATH)/%.S
+ $(CC) $(CFLAGS) -x assembler-with-cpp -c $< -o $@
+
+# Build and link the tests
+%: %.c $(LINK_SCRIPT) $(CRT_OBJS) $(MINILIB_OBJS)
+ $(CC) $(CFLAGS) $< -o $@ $(LDFLAGS)
+
+memory: CFLAGS+=-DCHECK_UNALIGNED=0
+
+# Running
+QEMU_OPTS+=-serial chardev:output -kernel
diff --git a/tests/tcg/alpha/system/boot.S b/tests/tcg/alpha/system/boot.S
new file mode 100644
index 00000000000..9791b1ef7c8
--- /dev/null
+++ b/tests/tcg/alpha/system/boot.S
@@ -0,0 +1,511 @@
+/*
+ * Minimal Alpha system boot code.
+ *
+ * Copyright Linaro Ltd 2019
+ */
+
+ .set noat
+ .set nomacro
+ .arch ev6
+ .text
+
+.macro load_pci_io reg
+ /* For typhoon, this is
+ * 0xfffffc0000000000 -- kseg identity map
+ * + 0x10000000000 -- typhoon pio base
+ * + 0x1fc000000 -- typhoon pchip0 pci base
+ * = 0xfffffd01fc000000
+ */
+ ldah \reg, -3 /* ff..fd0000 */
+ lda \reg, 0x1fc(\reg) /* ff..fd01fc */
+ sll \reg, 24, \reg
+.endm
+
+#define com1Rbr 0x3f8
+#define com1Thr 0x3f8
+#define com1Ier 0x3f9
+#define com1Iir 0x3fa
+#define com1Lcr 0x3fb
+#define com1Mcr 0x3fc
+#define com1Lsr 0x3fd
+#define com1Msr 0x3fe
+#define com1Scr 0x3ff
+#define com1Dll 0x3f8
+#define com1Dlm 0x3f9
+
+#define PAL_halt 0
+#define PAL_wrent 52
+#define PAL_wrkgp 55
+
+ .text
+ .p2align 4
+ .globl _start
+ .ent _start
+_start:
+ br $gp, .+4
+ ldah $gp, 0($gp) !gpdisp!1
+ lda $gp, 0($gp) !gpdisp!1
+
+ ldah $sp, $stack_end($gp) !gprelhigh
+ lda $sp, $stack_end($sp) !gprellow
+
+ /* Install kernel gp for exception handlers. */
+ mov $gp, $16
+ call_pal PAL_wrkgp
+
+ /* Install exception handlers. */
+ ldah $16, entInt($gp) !gprelhigh
+ lda $16, entInt($16) !gprellow
+ lda $17, 0
+ call_pal PAL_wrent
+
+ ldah $16, entArith($gp) !gprelhigh
+ lda $16, entArith($16) !gprellow
+ lda $17, 1
+ call_pal PAL_wrent
+
+ ldah $16, entMM($gp) !gprelhigh
+ lda $16, entMM($16) !gprellow
+ lda $17, 2
+ call_pal PAL_wrent
+
+ ldah $16, entIF($gp) !gprelhigh
+ lda $16, entIF($16) !gprellow
+ lda $17, 3
+ call_pal PAL_wrent
+
+ ldah $16, entUna($gp) !gprelhigh
+ lda $16, entUna($16) !gprellow
+ lda $17, 4
+ call_pal PAL_wrent
+
+ ldah $16, entSys($gp) !gprelhigh
+ lda $16, entSys($16) !gprellow
+ lda $17, 5
+ call_pal PAL_wrent
+
+ /*
+ * Initialize COM1.
+ */
+ load_pci_io $1
+ lda $2, 0x87 /* outb(0x87, com1Lcr); */
+ stb $2, com1Lcr($1)
+ stb $31, com1Dlm($1) /* outb(0, com1Dlm); */
+ lda $2, 3 /* baudconst 3 => 56000 */
+ stb $2, com1Dll($1) /* outb(baudconst, com1Dll); */
+ lda $2, 0x07
+ stb $2, com1Lcr($1) /* outb(0x07, com1Lcr) */
+ lda $2, 0x0f
+ stb $2, com1Mcr($1) /* outb(0x0f, com1Mcr) */
+
+ bsr $26, main !samegp
+
+ /* fall through to _exit */
+ .end _start
+
+ .globl _exit
+ .ent _exit
+_exit:
+ .frame $sp, 0, $26, 0
+ .prologue 0
+
+ /* We cannot return an error code. */
+ call_pal PAL_halt
+ .end _exit
+
+/*
+ * We have received an exception that we don't handle. Log and exit.
+ */
+ .ent log_exit
+log_exit:
+entInt:
+entArith:
+entMM:
+entIF:
+entUna:
+entSys:
+ ldah $16, $errormsg($gp) !gprelhigh
+ lda $16, $errormsg($16) !gprellow
+ bsr $26, __sys_outs !samegp
+ bsr $26, _exit !samegp
+ .end log_exit
+
+ .section .rodata
+$errormsg:
+ .string "Terminated by exception.\n"
+ .previous
+
+ /*
+ * Helper Functions
+ */
+
+ /* Output a single character to serial port */
+ .global __sys_outc
+ .ent __sys_outc
+__sys_outc:
+ .frame $sp, 0, $26, 0
+ .prologue 0
+
+ load_pci_io $1
+
+ /*
+ * while ((inb(com1Lsr) & 0x20) == 0)
+ * continue;
+ */
+1: ldbu $0, com1Lsr($1)
+ and $0, 0x20, $0
+ beq $0, 1b
+
+ /* outb(c, com1Thr); */
+ stb $16, com1Thr($1)
+ ret
+ .end __sys_outc
+
+ /* Output a nul-terminated string to serial port */
+ .global __sys_outs
+ .ent __sys_outs
+__sys_outs:
+ .frame $sp, 0, $26, 0
+ .prologue 0
+
+ load_pci_io $1
+
+ ldbu $2, 0($16)
+ beq $2, 9f
+
+ /*
+ * while ((inb(com1Lsr) & 0x20) == 0)
+ * continue;
+ */
+1: ldbu $0, com1Lsr($1)
+ and $0, 0x20, $0
+ beq $0, 1b
+
+ /* outb(c, com1Thr); */
+ stb $2, com1Thr($1)
+
+ addq $16, 1, $16
+ ldbu $2, 0($16)
+ bne $2, 1b
+
+9: ret
+ .end __sys_outs
+
+/*
+ * Division routines that are normally in libc.
+ *
+ * These do not follow the C calling convention. Arguments are in $24+$25,
+ * the result is in $27. Register $28 may be clobbered; everything else
+ * must be saved.
+ *
+ * We store the remainder in $28, so that we can share code.
+ *
+ * We do not signal divide by zero.
+ */
+
+/*
+ * Unsigned 64-bit division.
+ */
+
+ .globl __divqu
+ .ent __divqu
+__divqu:
+ .frame $sp, 48, $23
+ subq $sp, 48, $sp
+ stq $0, 0($sp)
+ stq $1, 8($sp)
+ stq $2, 16($sp)
+ stq $3, 24($sp)
+ stq $4, 32($sp)
+ .prologue 0
+
+#define mask $0
+#define divisor $1
+#define compare $2
+#define tmp1 $3
+#define tmp2 $4
+#define quotient $27
+#define modulus $28
+
+ mov $24, modulus
+ mov $25, divisor
+ mov $31, quotient
+ mov 1, mask
+ beq $25, 9f
+
+ /* Shift left until divisor >= modulus. */
+1: cmpult divisor, modulus, compare
+ blt divisor, 2f
+ addq divisor, divisor, divisor
+ addq mask, mask, mask
+ bne compare, 1b
+
+2: addq quotient, mask, tmp2
+ srl mask, 1, mask
+ cmpule divisor, modulus, compare
+ subq modulus, divisor, tmp1
+ cmovne compare, tmp2, quotient
+ srl divisor, 1, divisor
+ cmovne compare, tmp1, modulus
+ bne mask, 2b
+
+9: ldq $0, 0($sp)
+ ldq $1, 8($sp)
+ ldq $2, 16($sp)
+ ldq $3, 24($sp)
+ ldq $4, 32($sp)
+ addq $sp, 48, $sp
+ ret $31, ($23), 1
+
+#undef mask
+#undef divisor
+#undef compare
+#undef tmp1
+#undef tmp2
+#undef quotient
+#undef modulus
+
+ .end __divqu
+
+/*
+ * Unsigned 64-bit remainder.
+ * Note that __divqu above leaves the result in $28.
+ */
+
+ .globl __remqu
+ .ent __remqu
+__remqu:
+ .frame $sp, 16, $23
+ subq $sp, 16, $sp
+ stq $23, 0($sp)
+ .prologue 0
+
+ bsr $23, __divqu
+
+ ldq $23, 0($sp)
+ mov $28, $27
+ addq $sp, 16, $sp
+ ret $31, ($23), 1
+ .end __remqu
+
+/*
+ * Signed 64-bit division.
+ */
+
+ .globl __divqs
+ .ent __divqs
+__divqs:
+ .prologue 0
+
+ /* Common case: both arguments are positive. */
+ bis $24, $25, $28
+ bge $28, __divqu
+
+ /* At least one argument is negative. */
+ subq $sp, 32, $sp
+ stq $23, 0($sp)
+ stq $24, 8($sp)
+ stq $25, 16($sp)
+
+ /* Compute absolute values. */
+ subq $31, $24, $28
+ cmovlt $24, $28, $24
+ subq $31, $25, $28
+ cmovlt $25, $28, $25
+
+ bsr $23, __divqu
+
+ ldq $24, 8($sp)
+ ldq $25, 16($sp)
+
+ /* -a / b = a / -b = -(a / b) */
+ subq $31, $27, $23
+ xor $24, $25, $28
+ cmovlt $28, $23, $27
+
+ ldq $23, 0($sp)
+ addq $sp, 32, $sp
+ ret $31, ($23), 1
+ .end __divqs
+
+/*
+ * Signed 64-bit remainder.
+ */
+
+ .globl __remqs
+ .ent __remqs
+__remqs:
+ .prologue 0
+
+ /* Common case: both arguments are positive. */
+ bis $24, $25, $28
+ bge $28, __remqu
+
+ /* At least one argument is negative. */
+ subq $sp, 32, $sp
+ stq $23, 0($sp)
+ stq $24, 8($sp)
+ stq $25, 16($sp)
+
+ /* Compute absolute values. */
+ subq $31, $24, $28
+ cmovlt $24, $28, $24
+ subq $31, $25, $28
+ cmovlt $25, $28, $25
+
+ bsr $23, __divqu
+
+ ldq $23, 0($sp)
+ ldq $24, 8($sp)
+ ldq $25, 16($sp)
+
+ /* -a % b = -(a % b); a % -b = a % b. */
+ subq $31, $28, $27
+ cmovge $24, $28, $27
+
+ addq $sp, 32, $sp
+ ret $31, ($23), 1
+ .end __remqs
+
+/*
+ * Unsigned 32-bit division.
+ */
+
+ .globl __divlu
+ .ent __divlu
+__divlu:
+ .frame $sp, 32, $23
+ subq $sp, 32, $sp
+ stq $23, 0($sp)
+ stq $24, 8($sp)
+ stq $25, 16($sp)
+ .prologue 0
+
+ /* Zero extend and use the 64-bit routine. */
+ zap $24, 0xf0, $24
+ zap $25, 0xf0, $25
+ bsr $23, __divqu
+
+ addl $27, 0, $27
+ ldq $23, 0($sp)
+ ldq $24, 8($sp)
+ ldq $25, 16($sp)
+ addq $sp, 32, $sp
+ ret $31, ($23), 1
+ .end __divlu
+
+/*
+ * Unsigned 32-bit remainder.
+ */
+
+ .globl __remlu
+ .ent __remlu
+__remlu:
+ .frame $sp, 32, $23
+ subq $sp, 32, $sp
+ stq $23, 0($sp)
+ stq $24, 8($sp)
+ stq $25, 16($sp)
+ .prologue 0
+
+ /* Zero extend and use the 64-bit routine. */
+ zap $24, 0xf0, $24
+ zap $25, 0xf0, $25
+ bsr $23, __divqu
+
+ /* Recall that the remainder is returned in $28. */
+ addl $28, 0, $27
+ ldq $23, 0($sp)
+ ldq $24, 8($sp)
+ ldq $25, 16($sp)
+ addq $sp, 32, $sp
+ ret $31, ($23), 1
+ .end __remlu
+
+/*
+ * Signed 32-bit division.
+ */
+
+ .globl __divls
+ .ent __divls
+__divls:
+ .frame $sp, 32, $23
+ subq $sp, 32, $sp
+ stq $23, 0($sp)
+ stq $24, 8($sp)
+ stq $25, 16($sp)
+ .prologue 0
+
+ /* Sign extend. */
+ addl $24, 0, $24
+ addl $25, 0, $25
+
+ /* Compute absolute values. */
+ subq $31, $24, $28
+ cmovlt $24, $28, $24
+ subq $31, $25, $28
+ cmovlt $25, $28, $25
+
+ bsr $23, __divqu
+
+ ldq $24, 8($sp)
+ ldq $25, 16($sp)
+
+ /* Negate the unsigned result, if necessary. */
+ xor $24, $25, $28
+ subl $31, $27, $23
+ addl $27, 0, $27
+ addl $28, 0, $28
+ cmovlt $28, $23, $27
+
+ ldq $23, 0($sp)
+ addq $sp, 32, $sp
+ ret $31, ($23), 1
+ .end __divls
+
+/*
+ * Signed 32-bit remainder.
+ */
+
+ .globl __remls
+ .ent __remls
+__remls:
+ .frame $sp, 32, $23
+ subq $sp, 32, $sp
+ stq $23, 0($sp)
+ stq $24, 8($sp)
+ stq $25, 16($sp)
+ .prologue 0
+
+ /* Sign extend. */
+ addl $24, 0, $24
+ addl $25, 0, $25
+
+ /* Compute absolute values. */
+ subq $31, $24, $28
+ cmovlt $24, $28, $24
+ subq $31, $25, $28
+ cmovlt $25, $28, $25
+
+ bsr $23, __divqu
+
+ ldq $23, 0($sp)
+ ldq $24, 8($sp)
+ ldq $25, 16($sp)
+
+ /* Negate the unsigned result, if necessary. */
+ subl $31, $28, $27
+ addl $28, 0, $28
+ cmovge $24, $28, $27
+
+ addq $sp, 32, $sp
+ ret $31, ($23), 1
+ .end __remls
+
+ .data
+ .p2align 4
+stack:
+ .skip 65536
+$stack_end:
+ .type stack,@object
+ .size stack, . - stack
diff --git a/tests/tcg/alpha/system/kernel.ld b/tests/tcg/alpha/system/kernel.ld
new file mode 100644
index 00000000000..d2ac6ecfeb8
--- /dev/null
+++ b/tests/tcg/alpha/system/kernel.ld
@@ -0,0 +1,30 @@
+ENTRY(_start)
+
+SECTIONS
+{
+ /* Linux kernel legacy start address. */
+ . = 0xfffffc0000310000;
+ _text = .;
+ .text : {
+ *(.text)
+ }
+ .rodata : {
+ *(.rodata)
+ }
+ _etext = .;
+
+ . = ALIGN(8192);
+ _data = .;
+ .got : {
+ *(.got)
+ }
+ .data : {
+ *(.sdata)
+ *(.data)
+ }
+ _edata = .;
+ .bss : {
+ *(.bss)
+ }
+ _end = .;
+}
--
2.20.1
