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libgloss: aarch64: Add support for Armv8-R AArch64

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This patch adds support for Armv8-R AArch64.

Armv8-R AArch64 has no EL3, so we don't set vbar_el3, and adjust the
code to set up the MPU for Armv8-R.  So build a different flavour of the
startup code to support that.

We also add a specs file that uses this alternative startup code which
can be used with Armv8-R AArch64 models.
This commit is contained in:
Alex Coplan via Newlib 2020-09-29 17:27:18 +01:00 committed by Ken Brown
parent 57b622e902
commit 2c792cb780
4 changed files with 38 additions and 4 deletions
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3
libgloss/aarch64/Makefile.in
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@ -85,7 +85,8 @@ RDIMON_BSP = librdimon${${MULTILIBNAME}}.a
RDIMON_OBJS = $(patsubst %,rdimon-%,$(OBJS)) RDIMON_OBJS = $(patsubst %,rdimon-%,$(OBJS))
RDIMON_SCRIPTS = rdimon${${MULTILIBNAME}}.specs \ RDIMON_SCRIPTS = rdimon${${MULTILIBNAME}}.specs \
aem-ve${${MULTILIBNAME}}.specs \ aem-ve${${MULTILIBNAME}}.specs \
aem-validation${${MULTILIBNAME}}.specs aem-validation${${MULTILIBNAME}}.specs \
aem-v8-r${${MULTILIBNAME}}.specs
RDIMON_INSTALL = install-rdimon RDIMON_INSTALL = install-rdimon
CFLAGS = -g CFLAGS = -g

8
libgloss/aarch64/cpu-init/Makefile.in
View File

@ -62,7 +62,7 @@ AR = @AR@
LD = @LD@ LD = @LD@
RANLIB = @RANLIB@ RANLIB = @RANLIB@
CPU_INIT_OBJS = rdimon-aem-el3.o CPU_INIT_OBJS = rdimon-aem-el3.o rdimon-aem-v8-r.o
CPU_INIT_INSTALL = install-cpu-init CPU_INIT_INSTALL = install-cpu-init
CFLAGS = -g CFLAGS = -g
@ -79,10 +79,12 @@ all: ${CPU_INIT_OBJS}
.PHONY: test .PHONY: test
test: test:
# Static pattern rule for assembling cpu init files to object files. rdimon-aem-el3.o : rdimon-aem-el3.S
${CPU_INIT_OBJS}: %.o: %.S
$(CC) $(CFLAGS_FOR_TARGET) $(CFLAGS) $(INCLUDES) -DARM_RDI_MONITOR -o $@ -c $< $(CC) $(CFLAGS_FOR_TARGET) $(CFLAGS) $(INCLUDES) -DARM_RDI_MONITOR -o $@ -c $<
rdimon-aem-v8-r.o : rdimon-aem-el3.S
$(CC) $(CFLAGS_FOR_TARGET) $(CFLAGS) $(INCLUDES) -DARM_RDI_MONITOR -DBUILD_FOR_R_PROFILE -o $@ -c $<
clean mostlyclean: clean mostlyclean:
rm -f a.out core *.i *.o *-test *.srec *.dis *.x rm -f a.out core *.i *.o *-test *.srec *.dis *.x

11
libgloss/aarch64/cpu-init/rdimon-aem-el3.S
View File

@ -43,7 +43,9 @@ _init_vectors:
/* Installs a table of exception vectors to catch and handle all /* Installs a table of exception vectors to catch and handle all
exceptions by terminating the process with a diagnostic. */ exceptions by terminating the process with a diagnostic. */
adr x0, vectors adr x0, vectors
#ifndef BUILD_FOR_R_PROFILE
msr vbar_el3, x0 msr vbar_el3, x0
#endif
msr vbar_el2, x0 msr vbar_el2, x0
msr vbar_el1, x0 msr vbar_el1, x0
ret ret
@ -110,6 +112,14 @@ vectors:
.text .text
.align 2 .align 2
_flat_map: _flat_map:
#ifdef BUILD_FOR_R_PROFILE
mrs x0, sctlr_el2
orr x0, x0, #1 // SCTLR_EL2.M (enable MPU)
orr x0, x0, #(1 << 17) // SCTLR_EL2.BR (background regions)
msr sctlr_el2, x0
isb
ret
#else
/* Page table setup (identity mapping). */ /* Page table setup (identity mapping). */
adrp x0, ttb adrp x0, ttb
add x0, x0, :lo12:ttb add x0, x0, :lo12:ttb
@ -173,6 +183,7 @@ _flat_map:
isb isb
.Lnosve: .Lnosve:
ret ret
#endif
.data .data
.align 12 .align 12

20
libgloss/aarch64/elf-aem-v8-r.specs Normal file
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@ -0,0 +1,20 @@
# elf-aem-v8-r.specs
#
# Spec file for AArch64 baremetal newlib, libgloss on Armv8-R with version 2 of
# AngelAPI semi-hosting.
%rename link old_link
*link:
-Ttext-segment 0x10000 %(old_link)
%rename lib libc
*libgloss:
-lrdimon
*lib:
cpu-init/rdimon-aem-v8-r.o%s --start-group %(libc) %(libgloss) --end-group
*startfile:
crti%O%s crtbegin%O%s %{!pg:rdimon-crt0%O%s} %{pg:rdimon-crt0%O%s}