RISC-V: Support Ssccptr extension.

Support the Ssccptr extension, which allows the main memory to support
page table reads.

gcc/ChangeLog:

	* config/riscv/riscv-ext.def: New extension definition.
	* config/riscv/riscv-ext.opt: New extension mask.
	* doc/riscv-ext.texi: Document the new extension.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/arch-ssccptr.c: New test.

Signed-off-by: Jiawei <jiawei@iscas.ac.cn>

diff --git a/gcc/config/riscv/riscv-ext.def b/gcc/config/riscv/riscv-ext.def
index 98e7b82c8d17cb289a0ac6a0a0e00412fa63fd74..ec0a08c3282c68ec51ee0aa35a521723590e0273 100644 (file)
--- a/gcc/config/riscv/riscv-ext.def
+++ b/gcc/config/riscv/riscv-ext.def
@@ -1805,6 +1805,19 @@ DEFINE_RISCV_EXT(
   /* BITMASK_BIT_POSITION*/ BITMASK_NOT_YET_ALLOCATED,
   /* EXTRA_EXTENSION_FLAGS */ 0)
 
+DEFINE_RISCV_EXT(
+  /* NAME */ ssccptr,
+  /* UPPERCASE_NAME */ SSCCPTR,
+  /* FULL_NAME */ "Main memory supports page table reads",
+  /* DESC */ "",
+  /* URL */ ,
+  /* DEP_EXTS */ ({}),
+  /* SUPPORTED_VERSIONS */ ({{1, 0}}),
+  /* FLAG_GROUP */ ss,
+  /* BITMASK_GROUP_ID */ BITMASK_NOT_YET_ALLOCATED,
+  /* BITMASK_BIT_POSITION*/ BITMASK_NOT_YET_ALLOCATED,
+  /* EXTRA_EXTENSION_FLAGS */ 0)
+
 DEFINE_RISCV_EXT(
   /* NAME */ sscofpmf,
   /* UPPERCASE_NAME */ SSCOFPMF,

diff --git a/gcc/config/riscv/riscv-ext.opt b/gcc/config/riscv/riscv-ext.opt
index 73868798db680d78802b0b7624e6006500a1a756..f851678236bdab10a5f6d2889a3ecc00e10c8836 100644 (file)
--- a/gcc/config/riscv/riscv-ext.opt
+++ b/gcc/config/riscv/riscv-ext.opt
@@ -355,6 +355,8 @@ Mask(SMDBLTRP) Var(riscv_sm_subext)
 
 Mask(SSAIA) Var(riscv_ss_subext)
 
+Mask(SSCCPTR) Var(riscv_ss_subext)
+
 Mask(SSCOFPMF) Var(riscv_ss_subext)
 
 Mask(SSCSRIND) Var(riscv_ss_subext)

diff --git a/gcc/doc/riscv-ext.texi b/gcc/doc/riscv-ext.texi
index 2d2631e726dcea9137f32ba3ea20d2d662433dc2..83aa436b46658a73875c4ae859cd64ab64a9f797 100644 (file)
--- a/gcc/doc/riscv-ext.texi
+++ b/gcc/doc/riscv-ext.texi
@@ -534,6 +534,10 @@
 @tab 1.0
 @tab Advanced interrupt architecture extension for supervisor-mode
 
+@item ssccptr
+@tab 1.0
+@tab Main memory supports page table reads
+
 @item sscofpmf
 @tab 1.0
 @tab Count overflow & filtering extension

diff --git a/gcc/testsuite/gcc.target/riscv/arch-ssccptr.c b/gcc/testsuite/gcc.target/riscv/arch-ssccptr.c
new file mode 100644 (file)
index 0000000..902155a
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/arch-ssccptr.c
@@ -0,0 +1,5 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64i_ssccptr -mabi=lp64" } */
+int foo()
+{
+}