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efi_loader: allow compiling with clang

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On ARM systems gd is stored in register r9 or x18. When compiling with
clang gd is defined as a macro calling function gd_ptr(). So we can not
make assignments to gd.

In the UEFI sub-system we need to save gd when leaving to UEFI binaries and
have to restore gd when reentering U-Boot.

Define a new function set_gd() for setting gd and use it in the UEFI
sub-system.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Tested-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Heinrich Schuchardt 2020-05-27 01:58:30 +02:00
parent 0e69bcfb27
commit 4f7dc5f608
2 changed files with 14 additions and 5 deletions
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9
arch/arm/include/asm/global_data.h
View file

@ -117,4 +117,13 @@ static inline gd_t *get_gd(void)
#endif
#endif
static inline void set_gd(volatile gd_t *gd_ptr)
{
#ifdef CONFIG_ARM64
__asm__ volatile("ldr x18, %0\n" : : "m"(gd_ptr));
#else
__asm__ volatile("ldr r9, %0\n" : : "m"(gd_ptr));
#endif
}
#endif /* __ASM_GBL_DATA_H */

10
lib/efi_loader/efi_boottime.c
View file

@ -49,7 +49,7 @@ static efi_handle_t current_image;
* restriction so we need to manually swap its and our view of that register on
* EFI callback entry/exit.
*/
static volatile void *efi_gd, *app_gd;
static volatile gd_t *efi_gd, *app_gd;
#endif
/* 1 if inside U-Boot code, 0 if inside EFI payload code */
@ -89,7 +89,7 @@ int __efi_entry_check(void)
#ifdef CONFIG_ARM
assert(efi_gd);
app_gd = gd;
gd = efi_gd;
set_gd(efi_gd);
#endif
return ret;
}
@ -99,7 +99,7 @@ int __efi_exit_check(void)
{
int ret = --entry_count == 0;
#ifdef CONFIG_ARM
gd = app_gd;
set_gd(app_gd);
#endif
return ret;
}
@ -123,7 +123,7 @@ void efi_restore_gd(void)
/* Only restore if we're already in EFI context */
if (!efi_gd)
return;
gd = efi_gd;
set_gd(efi_gd);
#endif
}
@ -2920,7 +2920,7 @@ efi_status_t EFIAPI efi_start_image(efi_handle_t image_handle,
* otherwise __efi_entry_check() will put the wrong value into
* app_gd.
*/
gd = app_gd;
set_gd(app_gd);
#endif
/*
* To get ready to call EFI_EXIT below we have to execute the