RISC-V: PR30449, Add lga assembler macro support.

Originally discussion, https://github.com/riscv/riscv-isa-manual/pull/539

Added new load address pseudo instruction which is always expanded to GOT
access, no matter the .option rvc is set or not.

gas/
	PR 30449
	* config/tc-riscv.c (macro): Add M_LGA support.
	* testsuite/gas/riscv/la-variants.d: New.
	* testsuite/gas/riscv/la-variants.s: New.
include/
	PR 30449
	* opcode/riscv.h (M_LGA): New.
opcodes/
	PR 30449
	* riscv-opc.c (riscv_opcodes): Add lga support.

5 files changed, 61 insertions, 2 deletions

diff --git a/gas/config/tc-riscv.c b/gas/config/tc-riscv.c
index fceb53e..7684fa7 100644
--- a/gas/config/tc-riscv.c
+++ b/gas/config/tc-riscv.c
@@ -2010,16 +2010,20 @@ macro (struct riscv_cl_insn *ip, expressionS *imm_expr,
 
     case M_LA:
     case M_LLA:
+    case M_LGA:
       /* Load the address of a symbol into a register.  */
       if (!IS_SEXT_32BIT_NUM (imm_expr->X_add_number))
 	as_bad (_("offset too large"));
 
       if (imm_expr->X_op == O_constant)
 	load_const (rd, imm_expr);
-      else if (riscv_opts.pic && mask == M_LA) /* Global PIC symbol.  */
+      /* Global PIC symbol.  */
+      else if ((riscv_opts.pic && mask == M_LA)
+	       || mask == M_LGA)
 	pcrel_load (rd, rd, imm_expr, LOAD_ADDRESS_INSN,
 		    BFD_RELOC_RISCV_GOT_HI20, BFD_RELOC_RISCV_PCREL_LO12_I);
-      else /* Local PIC symbol, or any non-PIC symbol.  */
+      /* Local PIC symbol, or any non-PIC symbol.  */
+      else
 	pcrel_load (rd, rd, imm_expr, "addi",
 		    BFD_RELOC_RISCV_PCREL_HI20, BFD_RELOC_RISCV_PCREL_LO12_I);
       break;
diff --git a/gas/testsuite/gas/riscv/la-variants.d b/gas/testsuite/gas/riscv/la-variants.d
new file mode 100644
index 0000000..b1d3169
--- /dev/null
+++ b/gas/testsuite/gas/riscv/la-variants.d
@@ -0,0 +1,42 @@
+#as:
+#objdump: -dr
+
+.*:[ 	]+file format .*
+
+
+Disassembly of section .text:
+
+0+000 <.text>:
+[ 	]+[0-9a-f]+:[ 	]+00000517[ 	]+auipc[ 	]+a0,0x0
+[ 	]+[0-9a-f]+:[ 	]+R_RISCV_PCREL_HI20[ 	]+a
+[ 	]+[0-9a-f]+:[ 	]+R_RISCV_RELAX[ 	]+\*ABS\*
+[ 	]+[0-9a-f]+:[ 	]+00050513[ 	]+mv[ 	]+a0,a0
+[ 	]+[0-9a-f]+:[ 	]+R_RISCV_PCREL_LO12_I[ 	]+\.L0[ ]+
+[ 	]+[0-9a-f]+:[ 	]+R_RISCV_RELAX[ 	]+\*ABS\*
+[ 	]+[0-9a-f]+:[ 	]+00000597[ 	]+auipc[ 	]+a1,0x0
+[ 	]+[0-9a-f]+:[ 	]+R_RISCV_PCREL_HI20[ 	]+a
+[ 	]+[0-9a-f]+:[ 	]+R_RISCV_RELAX[ 	]+\*ABS\*
+[ 	]+[0-9a-f]+:[ 	]+00058593[ 	]+mv[ 	]+a1,a1
+[ 	]+[0-9a-f]+:[ 	]+R_RISCV_PCREL_LO12_I[ 	]+\.L0[ ]+
+[ 	]+[0-9a-f]+:[ 	]+R_RISCV_RELAX[ 	]+\*ABS\*
+[ 	]+[0-9a-f]+:[ 	]+00000617[ 	]+auipc[ 	]+a2,0x0
+[ 	]+[0-9a-f]+:[ 	]+R_RISCV_GOT_HI20[ 	]+a
+[ 	]+[0-9a-f]+:[ 	]+(00062603|00063603)[ 	]+(lw|ld)[ 	]+a2,0\(a2\).*
+[ 	]+[0-9a-f]+:[ 	]+R_RISCV_PCREL_LO12_I[ 	]+\.L0[ ]+
+[ 	]+[0-9a-f]+:[ 	]+R_RISCV_RELAX[ 	]+\*ABS\*
+[ 	]+[0-9a-f]+:[ 	]+00000697[ 	]+auipc[ 	]+a3,0x0
+[ 	]+[0-9a-f]+:[ 	]+R_RISCV_GOT_HI20[ 	]+a
+[ 	]+[0-9a-f]+:[ 	]+(0006a683|0006b683)[ 	]+(lw|ld)[ 	]+a3,0\(a3\).*
+[ 	]+[0-9a-f]+:[ 	]+R_RISCV_PCREL_LO12_I[ 	]+\.L0[ ]+
+[ 	]+[0-9a-f]+:[ 	]+R_RISCV_RELAX[ 	]+\*ABS\*
+[ 	]+[0-9a-f]+:[ 	]+00000717[ 	]+auipc[ 	]+a4,0x0
+[ 	]+[0-9a-f]+:[ 	]+R_RISCV_PCREL_HI20[ 	]+a
+[ 	]+[0-9a-f]+:[ 	]+R_RISCV_RELAX[ 	]+\*ABS\*
+[ 	]+[0-9a-f]+:[ 	]+00070713[ 	]+mv[ 	]+a4,a4
+[ 	]+[0-9a-f]+:[ 	]+R_RISCV_PCREL_LO12_I[ 	]+\.L0[ ]+
+[ 	]+[0-9a-f]+:[ 	]+R_RISCV_RELAX[ 	]+\*ABS\*
+[ 	]+[0-9a-f]+:[ 	]+00000797[ 	]+auipc[ 	]+a5,0x0
+[ 	]+[0-9a-f]+:[ 	]+R_RISCV_GOT_HI20[ 	]+a
+[ 	]+[0-9a-f]+:[ 	]+(0007a783|0007b783)[ 	]+(lw|ld)[ 	]+a5,0\(a5\).*
+[ 	]+[0-9a-f]+:[ 	]+R_RISCV_PCREL_LO12_I[ 	]+\.L0[ ]+
+[ 	]+[0-9a-f]+:[ 	]+R_RISCV_RELAX[ 	]+\*ABS\*
diff --git a/gas/testsuite/gas/riscv/la-variants.s b/gas/testsuite/gas/riscv/la-variants.s
new file mode 100644
index 0000000..bc3b0fe
--- /dev/null
+++ b/gas/testsuite/gas/riscv/la-variants.s
@@ -0,0 +1,11 @@
+# lla is always local, lga is always global, and la depends on pic
+	.extern a
+.text
+	.option nopic
+	la a0, a
+	lla a1, a
+	lga a2, a
+	.option pic
+	la a3, a
+	lla a4, a
+	lga a5, a
diff --git a/include/opcode/riscv.h b/include/opcode/riscv.h
index e86a1bd..877ec66 100644
--- a/include/opcode/riscv.h
+++ b/include/opcode/riscv.h
@@ -502,6 +502,7 @@ enum
 {
   M_LA,
   M_LLA,
+  M_LGA,
   M_LA_TLS_GD,
   M_LA_TLS_IE,
   M_LB,
diff --git a/opcodes/riscv-opc.c b/opcodes/riscv-opc.c
index 1c3d9b0..57e7b90 100644
--- a/opcodes/riscv-opc.c
+++ b/opcodes/riscv-opc.c
@@ -405,6 +405,7 @@ const struct riscv_opcode riscv_opcodes[] =
 {"addi",        0, INSN_CLASS_I, "d,s,j",     MATCH_ADDI, MASK_ADDI, match_opcode, 0 },
 {"la",          0, INSN_CLASS_I, "d,B",       0, (int) M_LA, match_never, INSN_MACRO },
 {"lla",         0, INSN_CLASS_I, "d,B",       0, (int) M_LLA, match_never, INSN_MACRO },
+{"lga",         0, INSN_CLASS_I, "d,B",       0, (int) M_LGA, match_never, INSN_MACRO },
 {"la.tls.gd",   0, INSN_CLASS_I, "d,A",       0, (int) M_LA_TLS_GD, match_never, INSN_MACRO },
 {"la.tls.ie",   0, INSN_CLASS_I, "d,A",       0, (int) M_LA_TLS_IE, match_never, INSN_MACRO },
 {"neg",         0, INSN_CLASS_I, "d,t",       MATCH_SUB, MASK_SUB|MASK_RS1, match_opcode, INSN_ALIAS }, /* sub 0  */