cores
/
microwatt
mirror of https://github.com/antonblanchard/microwatt
3
1
Fork 1
Code Issues Projects Releases Wiki Activity

Merge pull request #166 from paulusmack/master

Browse Source 
MSR fixes, implement privilege checking, implement dcbz
pull/168/head
Anton Blanchard 6 years ago committed by GitHub
parent 4160f2138d 102fbcfe9a
commit 1ba29a407a
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
19 changed files with 524 additions and 120 deletions
Show Stats Download Patch File Download Diff File

4
Makefile
Unescape Escape View File

@ -58,7 +58,7 @@ icache_tb.o: common.o wishbone_types.o icache.o wishbone_bram_wrapper.o
dcache.o: utils.o common.o wishbone_types.o plru.o cache_ram.o utils.o
dcache_tb.o: common.o wishbone_types.o dcache.o wishbone_bram_wrapper.o
insn_helpers.o:
loadstore1.o: common.o helpers.o
loadstore1.o: common.o helpers.o decode_types.o
logical.o: decode_types.o
multiply_tb.o: decode_types.o common.o glibc_random.o ppc_fx_insns.o multiply.o
multiply.o: common.o decode_types.o
@ -131,7 +131,7 @@ dmi_dtm_tb: dmi_dtm_tb.o sim_vhpi_c.o sim_bram_helpers_c.o
tests = $(sort $(patsubst tests/%.out,%,$(wildcard tests/*.out)))
tests_console = $(sort $(patsubst tests/%.console_out,%,$(wildcard tests/*.console_out)))

check: $(tests) $(test_console) test_micropython test_micropython_long
check: $(tests) $(tests_console) test_micropython test_micropython_long

check_light: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 test_micropython test_micropython_long $(tests_console)


5
README.md
Unescape Escape View File

@ -16,7 +16,10 @@ You can try out Microwatt/Micropython without hardware by using the ghdl simulat

- Build micropython. If you aren't building on a ppc64le box you
will need a cross compiler. If it isn't available on your distro
grab the powerpc64le-power8 toolchain from https://toolchains.bootlin.com
grab the powerpc64le-power8 toolchain from https://toolchains.bootlin.com.
You may need to set the CROSS_COMPILE environment variable
to the prefix used for your cross compilers. The default is
powerpc64le-linux-gnu-.

```
git clone https://github.com/micropython/micropython.git

17
common.vhdl
Unescape Escape View File

@ -7,6 +7,15 @@ use work.decode_types.all;

package common is

-- MSR bit numbers
constant MSR_SF : integer := (63 - 0); -- Sixty-Four bit mode
constant MSR_EE : integer := (63 - 48); -- External interrupt Enable
constant MSR_PR : integer := (63 - 49); -- PRoblem state
constant MSR_IR : integer := (63 - 58); -- Instruction Relocation
constant MSR_DR : integer := (63 - 59); -- Data Relocation
constant MSR_RI : integer := (63 - 62); -- Recoverable Interrupt
constant MSR_LE : integer := (63 - 63); -- Little Endian

-- SPR numbers
subtype spr_num_t is integer range 0 to 1023;

@ -109,6 +118,7 @@ package common is

type Decode2ToExecute1Type is record
valid: std_ulogic;
unit : unit_t;
insn_type: insn_type_t;
nia: std_ulogic_vector(63 downto 0);
write_reg: gspr_index_t;
@ -141,7 +151,7 @@ package common is
reserve : std_ulogic; -- set for larx/stcx
end record;
constant Decode2ToExecute1Init : Decode2ToExecute1Type :=
(valid => '0', insn_type => OP_ILLEGAL, bypass_data1 => '0', bypass_data2 => '0', bypass_data3 => '0',
(valid => '0', unit => NONE, insn_type => OP_ILLEGAL, bypass_data1 => '0', bypass_data2 => '0', bypass_data3 => '0',
lr => '0', rc => '0', oe => '0', invert_a => '0',
invert_out => '0', input_carry => ZERO, output_carry => '0', input_cr => '0', output_cr => '0',
is_32bit => '0', is_signed => '0', xerc => xerc_init, reserve => '0',
@ -204,7 +214,7 @@ package common is

type Execute1ToLoadstore1Type is record
valid : std_ulogic;
load : std_ulogic; -- is this a load or store
op : insn_type_t; -- what ld/st op to do
addr1 : std_ulogic_vector(63 downto 0);
addr2 : std_ulogic_vector(63 downto 0);
data : std_ulogic_vector(63 downto 0); -- data to write, unused for read
@ -219,13 +229,14 @@ package common is
reserve : std_ulogic; -- set for larx/stcx.
rc : std_ulogic; -- set for stcx.
end record;
constant Execute1ToLoadstore1Init : Execute1ToLoadstore1Type := (valid => '0', load => '0', ci => '0', byte_reverse => '0',
constant Execute1ToLoadstore1Init : Execute1ToLoadstore1Type := (valid => '0', op => OP_ILLEGAL, ci => '0', byte_reverse => '0',
sign_extend => '0', update => '0', xerc => xerc_init,
reserve => '0', rc => '0', others => (others => '0'));

type Loadstore1ToDcacheType is record
valid : std_ulogic;
load : std_ulogic;
dcbz : std_ulogic;
nc : std_ulogic;
reserve : std_ulogic;
addr : std_ulogic_vector(63 downto 0);

47
dcache.vhdl
Unescape Escape View File

@ -581,8 +581,12 @@ begin
wr_data <= r0.data;
wr_sel <= r0.byte_sel;
else
-- Otherwise, we might be doing a reload
-- Otherwise, we might be doing a reload or a DCBZ
if r1.req.dcbz = '1' then
wr_data <= (others => '0');
else
wr_data <= wishbone_in.dat;
end if;
wr_sel <= (others => '1');
wr_addr <= std_ulogic_vector(to_unsigned(r1.store_row, ROW_BITS));
end if;
@ -593,7 +597,8 @@ begin
if reloading and wishbone_in.ack = '1' and r1.store_way = i then
do_write <= '1';
end if;
if req_op = OP_STORE_HIT and req_hit_way = i and cancel_store = '0' then
if req_op = OP_STORE_HIT and req_hit_way = i and cancel_store = '0' and
r1.req.dcbz = '0' then
assert not reloading report "Store hit while in state:" &
state_t'image(r1.state)
severity FAILURE;
@ -719,6 +724,7 @@ begin
r1.state <= NC_LOAD_WAIT_ACK;

when OP_STORE_HIT | OP_STORE_MISS =>
if r0.dcbz = '0' then
r1.wb.sel <= r0.byte_sel;
r1.wb.adr <= r0.addr(r1.wb.adr'left downto 3) & "000";
r1.wb.dat <= r0.data;
@ -731,6 +737,41 @@ begin
r1.stcx_fail <= '1';
r1.state <= IDLE;
end if;
else
-- dcbz is handled much like a load miss except
-- that we are writing to memory instead of reading
r1.store_index <= req_index;
r1.store_row <= get_row(req_laddr);

if req_op = OP_STORE_HIT then
r1.store_way <= req_hit_way;
else
r1.store_way <= replace_way;

-- Force misses on the victim way while zeroing
cache_valids(req_index)(replace_way) <= '0';

-- Store new tag in selected way
for i in 0 to NUM_WAYS-1 loop
if i = replace_way then
tagset := cache_tags(req_index);
write_tag(i, tagset, req_tag);
cache_tags(req_index) <= tagset;
end if;
end loop;
end if;

-- Set up for wishbone writes
r1.wb.adr <= req_laddr(r1.wb.adr'left downto 0);
r1.wb.sel <= (others => '1');
r1.wb.we <= '1';
r1.wb.dat <= (others => '0');
r1.wb.cyc <= '1';
r1.wb.stb <= '1';

-- Handle the rest like a load miss
r1.state <= RELOAD_WAIT_ACK;
end if;

-- OP_NONE and OP_BAD do nothing
when OP_NONE =>
@ -766,7 +807,7 @@ begin
-- not idle, which we don't currently know how to deal
-- with.
--
if r1.store_row = get_row(r1.req.addr) then
if r1.store_row = get_row(r1.req.addr) and r1.req.dcbz = '0' then
r1.slow_data <= wishbone_in.dat;
end if;


2
decode1.vhdl
Unescape Escape View File

@ -164,7 +164,7 @@ architecture behaviour of decode1 is
2#0000110110# => (ALU, OP_NOP, NONE, NONE, NONE, NONE, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- dcbst
2#0100010110# => (ALU, OP_NOP, NONE, NONE, NONE, NONE, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- dcbt
2#0011110110# => (ALU, OP_NOP, NONE, NONE, NONE, NONE, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- dcbtst
-- 2#1111110110# dcbz
2#1111110110# => (LDST, OP_DCBZ, RA_OR_ZERO, RB, NONE, NONE, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0'), -- dcbz
2#0110001001# => (ALU, OP_DIVE, RA, RB, NONE, RT, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '0'), -- divdeu
2#1110001001# => (ALU, OP_DIVE, RA, RB, NONE, RT, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '0'), -- divdeuo
2#0110001011# => (ALU, OP_DIVE, RA, RB, NONE, RT, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '1', '0', RC, '0', '0'), -- divweu

1
decode2.vhdl
Unescape Escape View File

@ -304,6 +304,7 @@ begin

-- execute unit
v.e.nia := d_in.nia;
v.e.unit := d_in.decode.unit;
v.e.insn_type := d_in.decode.insn_type;
v.e.read_reg1 := decoded_reg_a.reg;
v.e.read_data1 := decoded_reg_a.data;

120
execute1.vhdl
Unescape Escape View File

@ -50,6 +50,11 @@ architecture behaviour of execute1 is
slow_op_oe : std_ulogic;
slow_op_xerc : xer_common_t;
end record;
constant reg_type_init : reg_type :=
(e => Execute1ToWritebackInit, lr_update => '0',
mul_in_progress => '0', div_in_progress => '0', cntz_in_progress => '0',
slow_op_rc => '0', slow_op_oe => '0', slow_op_xerc => xerc_init,
others => (others => '0'));

signal r, rin : reg_type;

@ -73,6 +78,28 @@ architecture behaviour of execute1 is
signal x_to_divider: Execute1ToDividerType;
signal divider_to_x: DividerToExecute1Type;

type privilege_level is (USER, SUPER);
type op_privilege_array is array(insn_type_t) of privilege_level;
constant op_privilege: op_privilege_array := (
OP_ATTN => SUPER,
OP_MFMSR => SUPER,
OP_MTMSRD => SUPER,
OP_RFID => SUPER,
others => USER
);

function instr_is_privileged(op: insn_type_t; insn: std_ulogic_vector(31 downto 0))
return boolean is
begin
if op_privilege(op) = SUPER then
return true;
elsif op = OP_MFSPR or op = OP_MTSPR then
return insn(20) = '1';
else
return false;
end if;
end;

procedure set_carry(e: inout Execute1ToWritebackType;
carry32 : in std_ulogic;
carry : in std_ulogic) is
@ -126,11 +153,11 @@ architecture behaviour of execute1 is
-- tion MSR bits are not saved or restored.
-- Full function MSR bits lie in the range 0:32, 37:41, and
-- 48:63, and partial function MSR bits lie in the range
-- 33:36 and 42:47.
-- 33:36 and 42:47. (Note this is IBM bit numbering).
msr_out := (others => '0');
msr_out(32 downto 0) := msr(32 downto 0);
msr_out(41 downto 37) := msr(41 downto 37);
msr_out(63 downto 48) := msr(63 downto 48);
msr_out(63 downto 31) := msr(63 downto 31);
msr_out(26 downto 22) := msr(26 downto 22);
msr_out(15 downto 0) := msr(15 downto 0);
return msr_out;
end;

@ -195,6 +222,11 @@ begin
execute1_0: process(clk)
begin
if rising_edge(clk) then
if rst = '1' then
r <= reg_type_init;
ctrl.msr <= (MSR_SF => '1', MSR_LE => '1', others => '0');
ctrl.irq_state <= WRITE_SRR0;
else
r <= rin;
ctrl <= ctrl_tmp;
assert not (r.lr_update = '1' and e_in.valid = '1')
@ -204,6 +236,7 @@ begin
report "LR update to " & to_hstring(r.next_lr);
end if;
end if;
end if;
end process;

execute1_1: process(all)
@ -372,7 +405,7 @@ begin
ctrl_tmp.dec <= std_ulogic_vector(unsigned(ctrl.dec) - 1);

irq_valid := '0';
if ctrl.msr(63 - 48) = '1' then
if ctrl.msr(MSR_EE) = '1' then
if ctrl.dec(63) = '1' then
ctrl_tmp.irq_nia <= std_logic_vector(to_unsigned(16#900#, 64));
report "IRQ valid: DEC";
@ -409,21 +442,37 @@ begin
v.e.exc_write_reg := fast_spr_num(SPR_SRR1);
v.e.exc_write_data := ctrl.srr1;
v.e.exc_write_enable := '1';
ctrl_tmp.msr(63 - 48) <= '0'; -- clear EE
ctrl_tmp.msr(MSR_SF) <= '1';
ctrl_tmp.msr(MSR_EE) <= '0';
ctrl_tmp.msr(MSR_PR) <= '0';
ctrl_tmp.msr(MSR_IR) <= '0';
ctrl_tmp.msr(MSR_DR) <= '0';
ctrl_tmp.msr(MSR_RI) <= '0';
ctrl_tmp.msr(MSR_LE) <= '1';
f_out.redirect <= '1';
f_out.redirect_nia <= ctrl.irq_nia;
v.e.valid := e_in.valid;
report "Writing SRR1: " & to_hstring(ctrl.srr1);

elsif irq_valid = '1' then
elsif irq_valid = '1' and e_in.valid = '1' then
-- we need two cycles to write srr0 and 1
-- will need more when we have to write DSISR, DAR and HIER
-- Don't deliver the interrupt until we have a valid instruction
-- coming in, so we have a valid NIA to put in SRR0.
exception := e_in.valid;
exception := '1';
ctrl_tmp.srr1 <= msr_copy(ctrl.msr);

elsif e_in.valid = '1' then
elsif e_in.valid = '1' and ctrl.msr(MSR_PR) = '1' and
instr_is_privileged(e_in.insn_type, e_in.insn) then
-- generate a program interrupt
exception := '1';
ctrl_tmp.irq_nia <= std_logic_vector(to_unsigned(16#700#, 64));
ctrl_tmp.srr1 <= msr_copy(ctrl.msr);
-- set bit 45 to indicate privileged instruction type interrupt
ctrl_tmp.srr1(63 - 45) <= '1';
report "privileged instruction";
elsif e_in.valid = '1' and e_in.unit = ALU then

report "execute nia " & to_hstring(e_in.nia);

@ -555,7 +604,7 @@ begin
when OP_B =>
f_out.redirect <= '1';
if (insn_aa(e_in.insn)) then
f_out.redirect_nia <= std_ulogic_vector(signed(b_in));
f_out.redirect_nia <= b_in;
else
f_out.redirect_nia <= std_ulogic_vector(signed(e_in.nia) + signed(b_in));
end if;
@ -571,7 +620,7 @@ begin
if ppc_bc_taken(bo, bi, e_in.cr, a_in) = 1 then
f_out.redirect <= '1';
if (insn_aa(e_in.insn)) then
f_out.redirect_nia <= std_ulogic_vector(signed(b_in));
f_out.redirect_nia <= b_in;
else
f_out.redirect_nia <= std_ulogic_vector(signed(e_in.nia) + signed(b_in));
end if;
@ -594,7 +643,17 @@ begin
when OP_RFID =>
f_out.redirect <= '1';
f_out.redirect_nia <= a_in(63 downto 2) & "00"; -- srr0
ctrl_tmp.msr <= msr_copy(std_ulogic_vector(signed(b_in))); -- srr1
-- Can't use msr_copy here because the partial function MSR
-- bits should be left unchanged, not zeroed.
ctrl_tmp.msr(63 downto 31) <= b_in(63 downto 31);
ctrl_tmp.msr(26 downto 22) <= b_in(26 downto 22);
ctrl_tmp.msr(15 downto 0) <= b_in(15 downto 0);
if b_in(MSR_PR) = '1' then
ctrl_tmp.msr(MSR_EE) <= '1';
ctrl_tmp.msr(MSR_IR) <= '1';
ctrl_tmp.msr(MSR_DR) <= '1';
end if;

when OP_CMPB =>
result := ppc_cmpb(c_in, b_in);
result_en := '1';
@ -668,7 +727,7 @@ begin
end loop;
end if;
when OP_MFMSR =>
result := msr_copy(ctrl.msr);
result := ctrl.msr;
result_en := '1';
when OP_MFSPR =>
report "MFSPR to SPR " & integer'image(decode_spr_num(e_in.insn)) &
@ -725,8 +784,22 @@ begin
end if;
v.e.write_cr_data := c_in(31 downto 0);
when OP_MTMSRD =>
-- FIXME handle just the bits we need to.
ctrl_tmp.msr <= msr_copy(c_in);
if e_in.insn(16) = '1' then
-- just update EE and RI
ctrl_tmp.msr(MSR_EE) <= c_in(MSR_EE);
ctrl_tmp.msr(MSR_RI) <= c_in(MSR_RI);
else
-- Architecture says to leave out bits 3 (HV), 51 (ME)
-- and 63 (LE) (IBM bit numbering)
ctrl_tmp.msr(63 downto 61) <= c_in(63 downto 61);
ctrl_tmp.msr(59 downto 13) <= c_in(59 downto 13);
ctrl_tmp.msr(11 downto 1) <= c_in(11 downto 1);
if c_in(MSR_PR) = '1' then
ctrl_tmp.msr(MSR_EE) <= '1';
ctrl_tmp.msr(MSR_IR) <= '1';
ctrl_tmp.msr(MSR_DR) <= '1';
end if;
end if;
when OP_MTSPR =>
report "MTSPR to SPR " & integer'image(decode_spr_num(e_in.insn)) &
"=" & to_hstring(c_in);
@ -781,11 +854,6 @@ begin
stall_out <= '1';
x_to_divider.valid <= '1';

when OP_LOAD | OP_STORE =>
-- loadstore/dcache has its own port to writeback
v.e.valid := '0';
lv.valid := '1';

when others =>
terminate_out <= '1';
report "illegal";
@ -811,6 +879,14 @@ begin
report "Delayed LR update to " & to_hstring(next_nia);
stall_out <= '1';
end if;

elsif e_in.valid = '1' then
-- instruction for other units, i.e. LDST
v.e.valid := '0';
if e_in.unit = LDST then
lv.valid := '1';
end if;

elsif r.lr_update = '1' then
result_en := '1';
result := r.next_lr;
@ -877,9 +953,7 @@ begin
v.e.write_enable := result_en;

-- Outputs to loadstore1 (async)
if e_in.insn_type = OP_LOAD then
lv.load := '1';
end if;
lv.op := e_in.insn_type;
lv.addr1 := a_in;
lv.addr2 := b_in;
lv.data := c_in;

2
hello_world/Makefile
Unescape Escape View File

@ -1,7 +1,7 @@
ARCH = $(shell uname -m)
ifneq ("$(ARCH)", "ppc64")
ifneq ("$(ARCH)", "ppc64le")
CROSS_COMPILE ?= powerpc64le-linux-
CROSS_COMPILE ?= powerpc64le-linux-gnu-
endif
endif


15
loadstore1.vhdl
Unescape Escape View File

@ -3,6 +3,7 @@ use ieee.std_logic_1164.all;
use ieee.numeric_std.all;

library work;
use work.decode_types.all;
use work.common.all;
use work.helpers.all;

@ -42,6 +43,7 @@ architecture behave of loadstore1 is
type reg_stage_t is record
-- latch most of the input request
load : std_ulogic;
dcbz : std_ulogic;
addr : std_ulogic_vector(63 downto 0);
store_data : std_ulogic_vector(63 downto 0);
load_data : std_ulogic_vector(63 downto 0);
@ -146,7 +148,6 @@ begin
two_dwords := or (r.second_bytes);

-- load data formatting
if r.load = '1' then
byte_offset := unsigned(r.addr(2 downto 0));
brev_lenm1 := "000";
if r.byte_reverse = '1' then
@ -193,12 +194,17 @@ begin
data_trimmed(i * 8 + 7 downto i * 8) := x"00";
end case;
end loop;
end if;

case r.state is
when IDLE =>
if l_in.valid = '1' then
v.load := l_in.load;
v.load := '0';
v.dcbz := '0';
if l_in.op = OP_LOAD then
v.load := '1';
elsif l_in.op = OP_DCBZ then
v.dcbz := '1';
end if;
v.addr := lsu_sum;
v.write_reg := l_in.write_reg;
v.length := l_in.length;
@ -229,7 +235,6 @@ begin
v.addr := lsu_sum;

-- Do byte reversing and rotating for stores in the first cycle
if v.load = '0' then
byte_offset := unsigned(lsu_sum(2 downto 0));
brev_lenm1 := "000";
if l_in.byte_reverse = '1' then
@ -240,7 +245,6 @@ begin
j := to_integer(k) * 8;
v.store_data(j + 7 downto j) := l_in.data(i * 8 + 7 downto i * 8);
end loop;
end if;

req := '1';
stall := '1';
@ -293,6 +297,7 @@ begin
-- Update outputs to dcache
d_out.valid <= req;
d_out.load <= v.load;
d_out.dcbz <= v.dcbz;
d_out.nc <= v.nc;
d_out.reserve <= v.reserve;
d_out.addr <= addr;

2
rust_lib_demo/Makefile
Unescape Escape View File

@ -1,7 +1,7 @@
ARCH = $(shell uname -m)
ifneq ("$(ARCH)", "ppc64")
ifneq ("$(ARCH)", "ppc64le")
CROSS_COMPILE ?= powerpc64le-linux-
CROSS_COMPILE ?= powerpc64le-linux-gnu-
endif
endif


2
tests/Makefile.test
Unescape Escape View File

@ -1,7 +1,7 @@
ARCH = $(shell uname -m)
ifneq ("$(ARCH)", "ppc64")
ifneq ("$(ARCH)", "ppc64le")
CROSS_COMPILE ?= powerpc64le-linux-
CROSS_COMPILE ?= powerpc64le-linux-gnu-
endif
endif


3
tests/privileged/Makefile
Unescape Escape View File

@ -0,0 +1,3 @@
TEST=privileged

include ../Makefile.test

91
tests/privileged/head.S
Unescape Escape View File

@ -0,0 +1,91 @@
/* Copyright 2013-2014 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

#define STACK_TOP 0x8000

/* Load an immediate 64-bit value into a register */
#define LOAD_IMM64(r, e) \
lis r,(e)@highest; \
ori r,r,(e)@higher; \
rldicr r,r, 32, 31; \
oris r,r, (e)@h; \
ori r,r, (e)@l;

.section ".head","ax"

/*
* Microwatt currently enters in LE mode at 0x0, so we don't need to
* do any endian fix ups
*/
. = 0
.global _start
_start:
b boot_entry

.global boot_entry
boot_entry:
/* setup stack */
LOAD_IMM64(%r1, STACK_TOP - 0x100)
LOAD_IMM64(%r12, main)
mtctr %r12
bctrl
attn // terminate on exit
b .

/* Call a function with a specified MSR value */
.global call_with_msr
call_with_msr:
mtsrr0 %r4
mr %r12,%r4
mtsrr1 %r5
rfid

#define EXCEPTION(nr) \
.= nr ;\
li %r3,nr ;\
blr

EXCEPTION(0x300)
EXCEPTION(0x380)
EXCEPTION(0x400)
EXCEPTION(0x480)
EXCEPTION(0x500)
EXCEPTION(0x600)
EXCEPTION(0x700)
EXCEPTION(0x800)
EXCEPTION(0x900)
EXCEPTION(0x980)
EXCEPTION(0xa00)
EXCEPTION(0xb00)

/*
* System call - used to exit from tests where MSR[PR]
* may have been set.
*/
. = 0xc00
blr

EXCEPTION(0xd00)
EXCEPTION(0xe00)
EXCEPTION(0xe20)
EXCEPTION(0xe40)
EXCEPTION(0xe60)
EXCEPTION(0xe80)
EXCEPTION(0xf00)
EXCEPTION(0xf20)
EXCEPTION(0xf40)
EXCEPTION(0xf60)
EXCEPTION(0xf80)

13
tests/privileged/powerpc.lds
Unescape Escape View File

@ -0,0 +1,13 @@
SECTIONS
{
_start = .;
. = 0;
.head : {
KEEP(*(.head))
}
. = 0x2000;
.text : { *(.text) }
. = 0x4000;
.data : { *(.data) }
.bss : { *(.bss) }
}

152
tests/privileged/privileged.c
Unescape Escape View File

@ -0,0 +1,152 @@
#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>

#include "console.h"

#define MSR_EE 0x8000
#define MSR_PR 0x4000
#define MSR_IR 0x0020
#define MSR_DR 0x0010

extern int call_with_msr(unsigned long arg, int (*fn)(unsigned long), unsigned long msr);

#define SRR0 26
#define SRR1 27

static inline unsigned long mfspr(int sprnum)
{
long val;

__asm__ volatile("mfspr %0,%1" : "=r" (val) : "i" (sprnum));
return val;
}

static inline void mtspr(int sprnum, unsigned long val)
{
__asm__ volatile("mtspr %0,%1" : : "i" (sprnum), "r" (val));
}

void print_string(const char *str)
{
for (; *str; ++str)
putchar(*str);
}

void print_hex(unsigned long val, int ndigits)
{
int i, x;

for (i = (ndigits - 1) * 4; i >= 0; i -= 4) {
x = (val >> i) & 0xf;
if (x >= 10)
putchar(x + 'a' - 10);
else
putchar(x + '0');
}
}

// i < 100
void print_test_number(int i)
{
print_string("test ");
putchar(48 + i/10);
putchar(48 + i%10);
putchar(':');
}

int priv_fn_1(unsigned long x)
{
__asm__ volatile("attn");
__asm__ volatile("li 3,0; sc");
return 0;
}

int priv_fn_2(unsigned long x)
{
__asm__ volatile("mfmsr 3");
__asm__ volatile("sc");
return 0;
}

int priv_fn_3(unsigned long x)
{
__asm__ volatile("mtmsrd 3");
__asm__ volatile("li 3,0; sc");
return 0;
}

int priv_fn_4(unsigned long x)
{
__asm__ volatile("rfid");
__asm__ volatile("li 3,0; sc");
return 0;
}

int priv_fn_5(unsigned long x)
{
__asm__ volatile("mfsrr0 3");
__asm__ volatile("sc");
return 0;
}

int priv_fn_6(unsigned long x)
{
__asm__ volatile("mtsrr0 3");
__asm__ volatile("sc");
return 0;
}

int priv_test(int (*fn)(unsigned long))
{
unsigned long msr;
int vec;

__asm__ volatile ("mtdec %0" : : "r" (0x7fffffff));
__asm__ volatile ("mfmsr %0" : "=r" (msr));
/* this should fail */
vec = call_with_msr(0, fn, msr | MSR_PR);
if (vec != 0x700)
return vec | 1;
/* SRR1 should be set correctly */
msr |= MSR_PR | MSR_EE | MSR_IR | MSR_DR;
if (mfspr(SRR1) != (msr | 0x40000))
return 2;
return 0;
}

int fail = 0;

void do_test(int num, int (*fn)(unsigned long))
{
int ret;

print_test_number(num);
ret = priv_test(fn);
if (ret == 0) {
print_string("PASS\r\n");
} else {
fail = 1;
print_string("FAIL ");
print_hex(ret, 4);
print_string(" SRR0=");
print_hex(mfspr(SRR0), 16);
print_string(" SRR1=");
print_hex(mfspr(SRR1), 16);
print_string("\r\n");
}
}

int main(void)
{
potato_uart_init();

do_test(1, priv_fn_1);
do_test(2, priv_fn_2);
do_test(3, priv_fn_3);
do_test(4, priv_fn_4);
do_test(5, priv_fn_5);
do_test(6, priv_fn_6);

return fail;
}

BIN
tests/test_privileged.bin
View File

Binary file not shown.

6
tests/test_privileged.console_out
Unescape Escape View File

@ -0,0 +1,6 @@
test 01:PASS
test 02:PASS
test 03:PASS
test 04:PASS
test 05:PASS
test 06:PASS

2
tests/update_console_tests
Unescape Escape View File

@ -3,7 +3,7 @@
# Script to update console related tests from source
#

for i in sc illegal decrementer xics ; do
for i in sc illegal decrementer xics privileged ; do
cd $i
make
cd -

14
wishbone_debug_master.vhdl
Unescape Escape View File

@ -49,6 +49,7 @@ architecture behaviour of wishbone_debug_master is
type state_t is (IDLE, WB_CYCLE, DMI_WAIT);
signal state : state_t;
signal do_inc : std_ulogic;

begin

@ -84,16 +85,16 @@ begin
reg_addr <= (others => '0');
reg_ctrl <= (others => '0');
else -- Standard register writes
if dmi_req and dmi_wr then
if do_inc = '1' then
-- Address register auto-increment
reg_addr <= std_ulogic_vector(unsigned(reg_addr) +
decode_autoinc(reg_ctrl(10 downto 9)));
elsif dmi_req and dmi_wr then
if dmi_addr = DBG_WB_ADDR then
reg_addr <= dmi_din;
elsif dmi_addr = DBG_WB_CTRL then
reg_ctrl <= dmi_din(10 downto 0);
end if;
elsif state = WB_CYCLE and (wb_in.ack and reg_ctrl(8))= '1' then
-- Address register auto-increment
reg_addr <= std_ulogic_vector(unsigned(reg_addr) +
decode_autoinc(reg_ctrl(10 downto 9)));
end if;
end if;
end if;
@ -145,6 +146,7 @@ begin
if (rst) then
state <= IDLE;
wb_out.stb <= '0';
do_inc <= '0';
else
case state is
when IDLE =>
@ -162,11 +164,13 @@ begin
--
wb_out.stb <= '0';
state <= DMI_WAIT;
do_inc <= reg_ctrl(8);
end if;
when DMI_WAIT =>
if dmi_req = '0' then
state <= IDLE;
end if;
do_inc <= '0';
end case;
end if;
end if;

Write Preview
Loading…
Cancel
Save