RFR: 8346706: RISC-V: Add available registers to hs_err

[Magnus Ihse Bursie]

On Fri, 20 Dec 2024 11:17:54 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

> Hi please consider.
> 
> This adds below to hs_err:
> 
> Floating point state:
> fcsr=1
> Floating point registers:
> f0=0xffffffff44a72000 | 1.84467e+19
> f1=0xffffffff44a72000 | 1.84467e+19
> ....
> f31=0xffffffff44a72000 | 1.84467e+19
> 
> Vector state:
> vstart=0x0000000000000000
> vl=0x0000000000000020
> vtype=0x0000000000000000
> vcsr=0x0000000000000000
> vlenb=0x0000000000000020
> Vector registers:
> v0=0x0101010101010101010101010101010101010101010101010101010101010101
> ....
> v31=0x0101010101010101010101010101010101010101010101010101010101010101
> 
> 
> To get vector the headers need to include those structures, hence build files hackery.
> This means if you compile on a kernel without RVV support the error handler will lack support for it.
> We don't care about RVV option as carshing in native may still use vector even if the jit do not.
> 
> I'm doubt full about the printing as double for fp regs, maybe that should be removed.
> 
> Local testing, running t1 over weekend.
> 
> Thanks, Robbin

make/hotspot/lib/CompileJvm.gmk line 139:

> 137: 
> 138: ifeq ($(call isTargetCpu, riscv64), true)
> 139:   JVM_CFLAGS += $(RVV_CFLAGS)

The new flag should be added to the JVM_CFLAGS at configure time. No need to export it to spec.gmk and do it at runtime.

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PR Review Comment: https://git.openjdk.org/jdk/pull/22845#discussion_r1893905421