[PATCH] perf symbol: Add RISCV case in get_plt_sizes

[cp0613 at linux.alibaba.com]

From: Chen Pei <cp0613 at linux.alibaba.com>

According to RISC-V psABI specification, the PLT (Program Linkage Table)
has the following layout:
- The first PLT entry occupies two 16-byte entries (32 bytes total)
- Subsequent PLT entries take up 16 bytes each

This aligns with the binutils-gdb implementation which defines the same
PLT sizes for RISC-V architecture.

Update get_plt_sizes() to set plt_header_size=32 and plt_entry_size=16
for EM_RISCV, matching the architecture's standard ABI.

Since AARCH64, LOONGARCH, and RISCV have the same PLT size definition,
they are merged together.

Link: https://github.com/riscv-non-isa/riscv-elf-psabi-doc
Link: https://sourceware.org/git/?p=binutils-gdb.git;a=blob;f=bfd/elfnn-riscv.c

Signed-off-by: Chen Pei <cp0613 at linux.alibaba.com>
---
 tools/perf/util/symbol-elf.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index 76912c62b6a0..806936d95523 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -372,10 +372,8 @@ static bool get_plt_sizes(struct dso *dso, GElf_Ehdr *ehdr, GElf_Shdr *shdr_plt,
 		*plt_entry_size = 12;
 		return true;
 	case EM_AARCH64:
-		*plt_header_size = 32;
-		*plt_entry_size = 16;
-		return true;
 	case EM_LOONGARCH:
+	case EM_RISCV:
 		*plt_header_size = 32;
 		*plt_entry_size = 16;
 		return true;
-- 
2.50.1