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base: fix shift overflow error in Bitfield::mask()

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Fixes genodelabs/genode#4249
This commit is contained in:
Johannes Schlatow 2021-08-16 18:17:20 +02:00 committed by Christian Helmuth
parent 7618c9410a
commit 88b3880c77
2 changed files with 51 additions and 1 deletions
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10
repos/base/include/util/register.h
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@ -149,7 +149,15 @@ struct Genode::Register
/**
* Get an unshifted mask of this field
*/
static constexpr access_t mask() { return ((access_t)1 << WIDTH) - 1; }
static constexpr access_t mask()
{
/* prevent compile error "left shift count >= width of type" */
if (_WIDTH < _ACCESS_WIDTH) {
return ((access_t)1 << _WIDTH) - 1;
} else {
return ~(access_t)0;
}
}
/**
* Get a mask of this field shifted by its shift in the register

42
repos/base/src/test/mmio/main.cc
View File

@ -69,6 +69,10 @@ struct Test_mmio : public Mmio
struct Bits_2 : Bitfield<44,4> { };
struct Bits_3 : Bitfield<0,24> { };
struct Bits_4 : Bitfield<60,4> { };
struct Bits_5 : Bitfield<0,64> { };
struct Bits_6 : Bitfield<16,64> { };
struct Bits_7 : Bitfield<12,90> { };
struct Bits_8 : Bitfield<0,72> { };
};
struct Bitset_64_0 : Bitset_2<Reg_64::Bits_0, Reg_64::Bits_1> { };
struct Bitset_64_1 : Bitset_3<Reg_64::Bits_4, Reg_64::Bits_3, Reg_64::Bits_2> { };
@ -463,6 +467,44 @@ void Component::construct(Genode::Env &env)
if (mmio.read<Reg::Bits_3>() != BITS_3) { failed(__LINE__, env); }
if (compare_mem(mmio_mem, cmp_mem, MMIO_SIZE)) { failed(__LINE__, env); }
/* test bitfields that are at least as wide as the register */
{
uint64_t const value_1 { 0x0123456789abcdef };
uint64_t const value_2 { 0x0123456789abcdef };
uint64_t const value_3 { 0x0123456789abcdef };
zero_mem(mmio_mem, MMIO_SIZE);
mmio.write<Reg::Bits_5>(value_1);
if (mmio.read<Reg::Bits_5>() != value_2) { failed(__LINE__, env); }
if (compare_mem(mmio_mem, (uint8_t *)&value_3, MMIO_SIZE)) { failed(__LINE__, env); }
}
{
uint64_t const value_1 { 0x0123456789abcdef };
uint64_t const value_2 { 0x0000456789abcdef };
uint64_t const value_3 { 0x456789abcdef0000 };
zero_mem(mmio_mem, MMIO_SIZE);
mmio.write<Reg::Bits_6>(value_1);
if (mmio.read<Reg::Bits_6>() != value_2) { failed(__LINE__, env); }
if (compare_mem(mmio_mem, (uint8_t *)&value_3, MMIO_SIZE)) { failed(__LINE__, env); }
}
{
uint64_t const value_1 { 0x0123456789abcdef };
uint64_t const value_2 { 0x0003456789abcdef };
uint64_t const value_3 { 0x3456789abcdef000 };
zero_mem(mmio_mem, MMIO_SIZE);
mmio.write<Reg::Bits_7>(value_1);
if (mmio.read<Reg::Bits_7>() != value_2) { failed(__LINE__, env); }
if (compare_mem(mmio_mem, (uint8_t *)&value_3, MMIO_SIZE)) { failed(__LINE__, env); }
}
{
uint64_t const value_1 { 0x0123456789abcdef };
uint64_t const value_2 { 0x0123456789abcdef };
uint64_t const value_3 { 0x0123456789abcdef };
zero_mem(mmio_mem, MMIO_SIZE);
mmio.write<Reg::Bits_8>(value_1);
if (mmio.read<Reg::Bits_8>() != value_2) { failed(__LINE__, env); }
if (compare_mem(mmio_mem, (uint8_t *)&value_3, MMIO_SIZE)) { failed(__LINE__, env); }
}
/* bitsets */
typedef Test_mmio::Bitset_64 Bitset;
enum { BITSET = 0x4abcdef056789123 };