Merge tag 'loongarch-6.12' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson

Pull LoongArch updates from Huacai Chen:

 - Fix objtool about do_syscall() and Clang

 - Enable generic CPU vulnerabilites support

 - Enable ACPI BGRT handling

 - Rework CPU feature probe from CPUCFG/IOCSR

 - Add ARCH_HAS_SET_MEMORY support

 - Add ARCH_HAS_SET_DIRECT_MAP support

 - Improve hardware page table walker

 - Simplify _percpu_read() and _percpu_write()

 - Add advanced extended IRQ model documentions

 - Some bug fixes and other small changes

* tag 'loongarch-6.12' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson:
  Docs/LoongArch: Add advanced extended IRQ model description
  LoongArch: Remove posix_types.h include from sigcontext.h
  LoongArch: Fix memleak in pci_acpi_scan_root()
  LoongArch: Simplify _percpu_read() and _percpu_write()
  LoongArch: Improve hardware page table walker
  LoongArch: Add ARCH_HAS_SET_DIRECT_MAP support
  LoongArch: Add ARCH_HAS_SET_MEMORY support
  LoongArch: Rework CPU feature probe from CPUCFG/IOCSR
  LoongArch: Enable ACPI BGRT handling
  LoongArch: Enable generic CPU vulnerabilites support
  LoongArch: Remove STACK_FRAME_NON_STANDARD(do_syscall)
  LoongArch: Set AS_HAS_THIN_ADD_SUB as y if AS_IS_LLVM
  LoongArch: Enable objtool for Clang
  objtool: Handle frame pointer related instructions

3 files changed, 31 insertions, 4 deletions

diff --git a/tools/objtool/arch/loongarch/decode.c b/tools/objtool/arch/loongarch/decode.c
index aee479d2191c..69b66994f2a1 100644
--- a/tools/objtool/arch/loongarch/decode.c
+++ b/tools/objtool/arch/loongarch/decode.c
@@ -122,7 +122,7 @@ static bool decode_insn_reg2i12_fomat(union loongarch_instruction inst,
 	switch (inst.reg2i12_format.opcode) {
 	case addid_op:
 		if ((inst.reg2i12_format.rd == CFI_SP) || (inst.reg2i12_format.rj == CFI_SP)) {
-			/* addi.d sp,sp,si12 or addi.d fp,sp,si12 */
+			/* addi.d sp,sp,si12 or addi.d fp,sp,si12 or addi.d sp,fp,si12 */
 			insn->immediate = sign_extend64(inst.reg2i12_format.immediate, 11);
 			ADD_OP(op) {
 				op->src.type = OP_SRC_ADD;
@@ -132,6 +132,15 @@ static bool decode_insn_reg2i12_fomat(union loongarch_instruction inst,
 				op->dest.reg = inst.reg2i12_format.rd;
 			}
 		}
+		if ((inst.reg2i12_format.rd == CFI_SP) && (inst.reg2i12_format.rj == CFI_FP)) {
+			/* addi.d sp,fp,si12 */
+			struct symbol *func = find_func_containing(insn->sec, insn->offset);
+
+			if (!func)
+				return false;
+
+			func->frame_pointer = true;
+		}
 		break;
 	case ldd_op:
 		if (inst.reg2i12_format.rj == CFI_SP) {
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index d086f207a3d3..6604f5d038aa 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -3043,10 +3043,27 @@ static int update_cfi_state(struct instruction *insn,
 				break;
 			}
 
-			if (op->dest.reg == CFI_SP && op->src.reg == CFI_BP) {
+			if (op->dest.reg == CFI_BP && op->src.reg == CFI_SP &&
+			    insn->sym->frame_pointer) {
+				/* addi.d fp,sp,imm on LoongArch */
+				if (cfa->base == CFI_SP && cfa->offset == op->src.offset) {
+					cfa->base = CFI_BP;
+					cfa->offset = 0;
+				}
+				break;
+			}
 
-				/* lea disp(%rbp), %rsp */
-				cfi->stack_size = -(op->src.offset + regs[CFI_BP].offset);
+			if (op->dest.reg == CFI_SP && op->src.reg == CFI_BP) {
+				/* addi.d sp,fp,imm on LoongArch */
+				if (cfa->base == CFI_BP && cfa->offset == 0) {
+					if (insn->sym->frame_pointer) {
+						cfa->base = CFI_SP;
+						cfa->offset = -op->src.offset;
+					}
+				} else {
+					/* lea disp(%rbp), %rsp */
+					cfi->stack_size = -(op->src.offset + regs[CFI_BP].offset);
+				}
 				break;
 			}
 
diff --git a/tools/objtool/include/objtool/elf.h b/tools/objtool/include/objtool/elf.h
index 2b8a69de4db8..d7e815c2fd15 100644
--- a/tools/objtool/include/objtool/elf.h
+++ b/tools/objtool/include/objtool/elf.h
@@ -68,6 +68,7 @@ struct symbol {
 	u8 warned	     : 1;
 	u8 embedded_insn     : 1;
 	u8 local_label       : 1;
+	u8 frame_pointer     : 1;
 	struct list_head pv_target;
 	struct reloc *relocs;
 };