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8358310: ZGC: riscv, ppc ZPlatformAddressOffsetBits may return a too large value

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Reviewed-by: fyang
Backport-of: 4618374269
This commit is contained in:
Martin Doerr
2025-06-12 17:30:38 +00:00
committed by Vitaly Provodin
parent 0cee690dc8
commit 5fca9ac582
4 changed files with 21 additions and 15 deletions
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12
src/hotspot/cpu/ppc/gc/x/xGlobals_ppc.cpp
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@@ -82,12 +82,12 @@
// Maximum value as per spec (Power ISA v2.07): 2 ^ 60 bytes, i.e. 1 EiB (exbibyte)
static const unsigned int MAXIMUM_MAX_ADDRESS_BIT = 60;
// Most modern power processors provide an address space with not more than 45 bit addressable bit,
// that is an address space of 32 TiB in size.
static const unsigned int DEFAULT_MAX_ADDRESS_BIT = 45;
// Minimum value returned, if probing fails: 64 GiB
static const unsigned int MINIMUM_MAX_ADDRESS_BIT = 36;
// Default value if probing is not implemented for a certain platform
// Max address bit is restricted by implicit assumptions in the code, for instance
// the bit layout of XForwardingEntry or Partial array entry (see XMarkStackEntry) in mark stack
static const size_t DEFAULT_MAX_ADDRESS_BIT = 46;
// Minimum value returned, if probing fails
static const size_t MINIMUM_MAX_ADDRESS_BIT = 36;
// Determines the highest addressable bit of the virtual address space (depends on platform)
// by trying to interact with memory in that address range,

8
src/hotspot/cpu/ppc/gc/z/zAddress_ppc.cpp
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@@ -35,9 +35,11 @@
#include <sys/mman.h>
#endif // LINUX
// Default value if probing is not implemented for a certain platform: 128TB
static const size_t DEFAULT_MAX_ADDRESS_BIT = 47;
// Minimum value returned, if probing fails: 64GB
// Default value if probing is not implemented for a certain platform
// Max address bit is restricted by implicit assumptions in the code, for instance
// the bit layout of ZForwardingEntry or Partial array entry (see ZMarkStackEntry) in mark stack
static const size_t DEFAULT_MAX_ADDRESS_BIT = 46;
// Minimum value returned, if probing fail
static const size_t MINIMUM_MAX_ADDRESS_BIT = 36;
static size_t probe_valid_max_address_bit() {

8
src/hotspot/cpu/riscv/gc/x/xGlobals_riscv.cpp
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@@ -144,9 +144,11 @@
// * 63-48 Fixed (16-bits, always zero)
//
// Default value if probing is not implemented for a certain platform: 128TB
static const size_t DEFAULT_MAX_ADDRESS_BIT = 47;
// Minimum value returned, if probing fails: 64GB
// Default value if probing is not implemented for a certain platform
// Max address bit is restricted by implicit assumptions in the code, for instance
// the bit layout of XForwardingEntry or Partial array entry (see XMarkStackEntry) in mark stack
static const size_t DEFAULT_MAX_ADDRESS_BIT = 46;
// Minimum value returned, if probing fails
static const size_t MINIMUM_MAX_ADDRESS_BIT = 36;
static size_t probe_valid_max_address_bit() {

8
src/hotspot/cpu/riscv/gc/z/zAddress_riscv.cpp
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@@ -37,9 +37,11 @@
#include <sys/mman.h>
#endif // LINUX
// Default value if probe is not implemented for a certain platform: 128TB
static const size_t DEFAULT_MAX_ADDRESS_BIT = 47;
// Minimum value returned, if probing fails: 64GB
// Default value if probing is not implemented for a certain platform
// Max address bit is restricted by implicit assumptions in the code, for instance
// the bit layout of ZForwardingEntry or Partial array entry (see ZMarkStackEntry) in mark stack
static const size_t DEFAULT_MAX_ADDRESS_BIT = 46;
// Minimum value returned, if probing fail
static const size_t MINIMUM_MAX_ADDRESS_BIT = 36;
static size_t probe_valid_max_address_bit() {