Nyaaori/rockbox
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

hwstub/jz4760b: add lua code to probe for ei/di and ext instructions

Browse source 
Add lua code to check whether ei/di and ext instructions are supported. This
is unclear since xburst is somewhere between mips32r1 and mips32r2. Details
results are below, but in summary: they don't work (ei has no effect, di/ext
cause illegal instruction exceptions)

> ./hwstub_shell -q -b -e 'require("jz/misc"); JZ.misc.enable_sram()' \
  -f lua/xburst.lua -e "XBURST.test_ext_inst(0xb32d0000)"
[...]
Selecting soc jz4760b. Redirecting HW to hwstub.soc.jz4760b
  data: d7168acf
error: lua/xburst.lua:209: call failed
trapped exception in call

> ./hwstub_shell -q -b -e 'require("jz/misc"); JZ.misc.enable_sram()' \
  -f lua/xburst.lua -e "XBURST.test_ei_di_inst(0xb32d0000)"
[...]
Selecting soc jz4760b. Redirecting HW to hwstub.soc.jz4760b
Testing ei
  Test SR
    Enable interrupts with CP0
    SR: 0x1
    Disable interrupts with CP0
    SR: 0x0
  Test ei/di
    Enable interrupts with ei
    SR: 0x0
    Disable interrupts with di
error: lua/xburst.lua:244: call failed
trapped exception in call

Change-Id: I2e162b5dd5e70488bcd8b58f3ca401a3ecab3c4b
This commit is contained in:
Amaury Pouly 2017-01-18 14:39:03 +01:00
parent 9bb6050d40
commit fdb98c258f
1 changed files with 67 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

67
utils/hwstub/tools/lua/xburst.lua
View file

@ -181,6 +181,73 @@ function XBURST.test_ebase(mem_addr)
print(" Exception result: " .. XBURST.do_ebase_exc_test(mem_addr))
end
function XBURST.test_ext_inst(mem_addr)
data_addr = mem_addr + 0x80
-----------
-- test ext
-----------
for pos = 0, 31 do
for size = 1, 32 - pos do
-- lui v0,<low part of data_addr>
-- addiu v0,v0,<high part>
-- lw v1,0(v0)
DEV.write32(mem_addr + 0, 0x3c020000 + bit32.rshift(data_addr, 16))
DEV.write32(mem_addr + 4, 0x8c430000 + bit32.band(data_addr, 0xffff))
DEV.write32(mem_addr + 8, 0x8c430000)
-- ext v1, v1, pos, size
DEV.write32(mem_addr + 12, 0x7c630000 + bit32.rshift(size - 1, 11) + bit32.rshift(pos, 6))
-- sw v1,0(v0)
DEV.write32(mem_addr + 16, 0xac430000)
-- jr ra
-- nop
DEV.write32(mem_addr + 20, 0x03e00008)
DEV.write32(mem_addr + 24, 0)
-- write some random data
data = math.random(0xffffffff)
print(string.format(" data: %x", data))
DEV.write32(data_addr, data)
DEV.call(mem_addr)
ext_data = DEV.read32(data_addr)
print(string.format(" result: %x vs %x", ext_data, bit32.extract(data, pos, size)))
break
end
break
end
end
function XBURST.test_ei_di_inst(mem_addr)
-- save SR and disable interrupts
old_sr = XBURST.read_cp0(12, 0)
XBURST.write_cp0(12, 0, bit32.replace(old_sr, 0, 0)) -- clear EI
print("Testing ei")
print(" Test SR")
print(" Enable interrupts with CP0")
XBURST.write_cp0(12, 0, bit32.replace(old_sr, 1, 0)) -- set EI
print(string.format(" SR: 0x%x", XBURST.read_cp0(12, 0)))
print(" Disable interrupts with CP0")
XBURST.write_cp0(12, 0, bit32.replace(old_sr, 0, 0)) -- clear EI
print(string.format(" SR: 0x%x", XBURST.read_cp0(12, 0)))
print(" Test ei/di")
print(" Enable interrupts with ei")
-- ei
-- jr ra
-- nop
DEV.write32(mem_addr + 4, 0x41606020)
DEV.write32(mem_addr + 4, 0x03e00008)
DEV.write32(mem_addr + 8, 0)
DEV.call(mem_addr)
print(string.format(" SR: 0x%x", XBURST.read_cp0(12, 0)))
print(" Disable interrupts with di")
-- di
DEV.write32(mem_addr + 4, 0x41606000)
DEV.call(mem_addr)
print(string.format(" SR: 0x%x", XBURST.read_cp0(12, 0)))
-- restore SR
XBURST.write_cp0(old_sr)
end
function XBURST.init()
-- enable CP1 in SR
sr_old = XBURST.read_cp0(12, 0)